Chatak Converter – Chatak to Square Feet, Katha, Cottah, Bigha & Square Metre

Written and fact-checked by Aadil Saif. Arithmetic independently re-verified · Last updated September 2026

Part of the India Land Unit Converter series.

The Bengal chain the chatak sits under is set out separately and not restated here. What the research found instead is that this unit is spelt five ways, that the spelling tracks whether the word is measuring land or weighing rice, that no instrument states its size at all, and that the Calcutta record nevertheless demonstrates its ratios twenty-one times over, from 1916 to 2025, without ever being asked to.

The Answer, First

1 chatak = 45 square feet = 5 square yards exactly = 4.1806368 square metres = 1/16 cottah = 1/968 acre.

One chatak, in	Amount	Terminates?
Square feet	45	yes
Square yards	5	yes
Square metres	4.1806368	yes
Cottah (katha)	0.0625	yes
Bengal bigha	0.003125	yes
Acres	0.001033…	no

Popular Chatak Conversions

Chatak	Square Feet	Square Meter	Katha (West Bengal)	Bigha (West Bengal)	Decimal
1	45	4.1806368	0.0625	0.003125	0.103306
2	90	8.3612736	0.125	0.00625	0.206612
3	135	12.5419104	0.1875	0.009375	0.309917
5	225	20.903184	0.3125	0.015625	0.516529
10	450	41.806368	0.625	0.03125	1.033058
20	900	83.612736	1.25	0.0625	2.066116
50	2,250	209.03184	3.125	0.15625	5.165289
100	4,500	418.06368	6.25	0.3125	10.330579
200	9,000	836.12736	12.5	0.625	20.661157
500	22,500	2,090.3184	31.25	1.5625	51.652893
1,000	45,000	4,180.6368	62.5	3.125	103.305785

Three things that table does not say.

No instrument states it. Searched across the Calcutta corpus and beyond: nothing states that a chatak is 45 square feet, and nothing states that sixteen make a cottah. This series had been grading the value sourced; this page corrects that to reported, and the correction now shows in the evidence column wherever the chatak appears on any page of this site.

The record corroborates the ratios anyway, without stating them. Twenty-one chittack figures read from Calcutta judgments between 1916 and 2025, and not one reaches sixteen. Twenty square-foot remainders, and not one reaches forty-five. That is corroboration, not proof, and it is not offered as proof.

The spelling you are searching for is probably the wrong one. Chatak returns 34 documents in the Calcutta High Court. Chittack returns 253 and chittak 221.

Contents

Convert The answer, first · To square feet and metres · To cottah and bigha · The small units

Understand Five spellings · Nothing states the chatak · Reading a Bengal schedule · Four mistakes

Check FAQ · Sources and method

Convert to a specific unit: Acre · Ankanam · Ares · Bigha · Biswa · Biswa Kacha · Cent · Decimal · Dhur · Dismil · Gaj · Gajam · Ground · Guntha · Hectare · Kanal · Katha · Killa · Lessa · Marla · Murabba · Nali · Perch · Pura · Square Centimeter · Square Feet · Square Inch · Square Karam · Square Kilometer · Square Meter · Square Mile · Square Yard

Every one of the other thirty-two units has a section on this page. Where two units are the same area their table would be identical, so the second section points at the first rather than repeating it.

Chatak to Other Units – Quick Conversion Formula

Every factor is a chatak's own size, 45 square feet, divided by the target unit's. To check any row by hand, take that number, divide, and compare.

Each one comes from a single anchor, the acre at 43,560 square feet, by exact fraction arithmetic. Where a factor recurs, the formula gives the fraction rather than a rounded decimal, because a rounded factor is a wrong instruction rather than an approximate one: the fraction is what has to be carried wherever the arithmetic must close.

Conversion	Formula	Status
Chatak to Acre	Chatak ÷ 968	Recurring
Chatak to Ankanam	Chatak × 0.625	Exact · Ankanam is regional. This row is the Standard; also 1.25
Chatak to Ares	Chatak × 0.041806368	Exact
Chatak to Bigha	Chatak × 0.003125	Exact · Bigha is regional. This row is the West Bengal / Assam / Jharkhand; also 0.001653, 0.004959, 0.006612 and 5 more
Chatak to Biswa	Chatak ÷ 30.25	Recurring · Biswa is regional. This row is the UP / Rajasthan pucca; also 0.051653, 0.099174, 0.103306
Chatak to Biswa Kacha	Chatak × 12/121	Recurring · Biswa Kacha is regional. This row is the Punjab / Haryana revenue; also 0.051653
Chatak to Cent	Chatak ÷ 9.68	Recurring
Chatak to Decimal	Chatak ÷ 9.68	Recurring
Chatak to Dhur	Chatak ÷ 1.5125	Recurring · Dhur is regional. This row is the Bihar / Jharkhand (Patna chain); also 12.5
Chatak to Dismil	Chatak ÷ 9.68	Recurring
Chatak to Gaj	Chatak × 5	Exact
Chatak to Gajam	Chatak × 5	Exact
Chatak to Ground	Chatak × 0.01875	Exact
Chatak to Guntha	Chatak ÷ 24.2	Recurring
Chatak to Hectare	Chatak × 0.00041806368	Exact
Chatak to Kanal	Chatak ÷ 121	Recurring · Kanal is regional. This row is the Standard (66-inch karam); also 0.01, 0.010888, 0.012346
Chatak to Katha	Chatak × 0.0625	Exact · Katha is regional. This row is the West Bengal / Jharkhand; also 0.033058, 0.015625, 0.025826 and 2 more
Chatak to Killa	Chatak ÷ 968	Recurring
Chatak to Lessa	Chatak × 0.3125	Exact
Chatak to Marla	Chatak ÷ 6.05	Recurring · Marla is regional. This row is the Standard (66-inch karam); also 0.2, 0.217769, 0.246914 and 1 more
Chatak to Murabba	Chatak ÷ 24,200	Recurring · Murabba is regional. This row is the Punjab canal colony; also 0.0000661
Chatak to Nali	Chatak ÷ 48	Recurring
Chatak to Perch	Chatak ÷ 6.05	Recurring
Chatak to Pura	Chatak × 0.00078125	Exact
Chatak to Square Centimeter	Chatak × 41,806.368	Exact
Chatak to Square Feet	Chatak × 45	Exact
Chatak to Square Inch	Chatak × 6,480	Exact
Chatak to Square Karam	Chatak × 180/121	Recurring · Square Karam is regional. This row is the Standard (66-inch karam); also 1.8, 1.959924, 2.222222
Chatak to Square Kilometer	Chatak × 0.0000041806368	Exact
Chatak to Square Meter	Chatak × 4.1806368	Exact
Chatak to Square Mile	Chatak ÷ 619,520	Recurring
Chatak to Square Yard	Chatak × 5	Exact

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Five Spellings, and the Rarest Is the Famous One

Search a Bengal land record, or the judgments about one, and the word you type decides what you find.

Spelling	Calcutta High Court documents
chittack	253
chittak	221
chatak	34
chhatak	27
chatack	2
the parent unit, cottah	1,062

Run 10 September 2026, doctypes:kolkata. Indian Kanoon's filter for the Calcutta High Court.

The spelling on every conversion site in India accounts for about six per cent of this unit's appearances in its own High Court. Chittack and chittak between them account for about eighty-eight.

That is not a curiosity. It is the difference between a title search that returns two hundred and fifty documents and one that returns thirty-four, on the same premises.

Why the spellings split, and what each one is doing

The Bengali word is not only a unit of land. It is also a unit of weight, one-sixteenth of a seer, and the transliteration tracks which job it is doing.

Land, in Bengal, is chittack or chittak. 474 documents between them, in the Calcutta High Court, running from 1916 to 2025.

Weight, mostly outside Bengal, is chhatak. A search for the word alongside seer and weight returns 23 documents, and they are maunds-seers-chhataks matters from the Patna and Allahabad High Courts rather than Calcutta land cases:

"12 maunds, 13 seers and 8 chhataks short" , Secretary of State v. Raghubar Dayal-Babu Ram, Allahabad High Court, 10 April 1933

"1 seer 4½ chhataks" , Vishnu Sugar Mills Ltd. v. Rameshwar Jute Mills Ltd., Patna High Court, 6 September 1969

And chatak belongs to neither convention, which is the likeliest reason it is rare in the record and universal online: it is the spelling of someone transliterating the word fresh rather than inheriting either the Calcutta conveyancing habit or the Bengal Presidency's weights-and-measures habit.

What to do about it. Search chittack first and chittak second. If a portal or a registry search box gives you nothing for chatak, the absence is a spelling artefact and not evidence that the premises are not there.

A query-syntax trap, disclosed because it is easy to fall into

Indian Kanoon ANDs bare terms and does not read OR. A query written chittack OR chittak OR chhatak returns zero documents, not because no document uses any of them, but because it is being read as a demand for a document that uses all three.

Every count on this page was therefore run as a single term or a single phrase, one at a time. A reader who repeats these searches with an OR and gets nothing has met the search engine, not the record.

Nothing States the Chatak. The Record Never Contradicts It.

This unit has no instrument behind it, and this page corrects the series' own data because of that.

What was searched for and not found. Any statement, in any Act, rule, manual or judgment, that a chatak is forty-five square feet. Any statement that sixteen make a cottah. "chittack" "45 square feet" returns 0 documents. "one chittack" … equal returns 0. "chittacks" "cottah" sixteen returns eight documents, and not one of them states the ratio, they merely use both units in the same schedule.

So the value is reported, not sourced. This site had been grading it sourced, on the strength of an arithmetic chain rather than a document. That is the mistake this series exists to avoid, and correcting it here changes the evidence column on every page that shows a chatak.

What the record does instead: it never contradicts the ratios

A Bengal deed writes an area in three places (cottahs, chittacks and square feet), and a numbered place in a mixed-radix figure has a carry point. If sixteen chittacks really make a cottah, no correctly written schedule can ever show a chittack figure of sixteen or more: it would have been carried. The same for a square-foot remainder of forty-five or more.

So the ratios are testable against schedules that were never written to prove anything.

Place	Figures read	Highest seen	Carries at
Chittacks	21	14	16
Square feet	20	44	45
Cottahs, where the same figure also states bighas	3	17	20
Cottahs, where no bigha is stated	17	38	n/a

Twenty-one chittack figures and not one reaches sixteen. Twenty square-foot remainders and not one reaches forty-five. The specimens run from Nanda Lal Roy v. Kazi Syed Abdul Aziz (28 February 1916) to Ganesh Saran Agarwala v. Kanhaya Lal (13 June 2025), a hundred and nine years, in sixteen different matters, every one of them named in Sources and Method below, and none of them about the size of a chatak.

The last two rows are a control, and a weaker one than the rows above it. Where a schedule states bighas as well, no cottah figure reaches twenty, because it would have carried into the bigha. Where no bigha is stated, the cottah figure has nothing above it and runs freely to 38. If that holds, the carry rule operates on exactly the places that have a place above them and on no others, which would make the pattern a property of the notation rather than of the sizes of Calcutta plots.

But there are only three observations in the constrained arm, against seventeen in the unconstrained one, and three figures below twenty is not surprising on its own. Treat the control as consistent with the reading rather than as establishing it; the twenty-one chittack figures are what the argument actually rests on.

What this is, and what it is not

It is not proof. A schedule can in principle be written uncarried, and this page has not read every Calcutta schedule ever drawn. Twenty-one observations cannot exclude the possibility that somewhere a deed says "19 chittacks".

There is also a selection effect, and it cuts both ways. These are schedules that reached a High Court, which means they were drafted by conveyancers and reproduced by judges, the population most likely to write a figure correctly, and least likely to show a sloppy one. A carry rule holding across professionally drafted deeds is weaker evidence about the unit than the same rule holding across, say, mutation entries written at a tehsil counter. What it does show is that the profession that writes Bengal schedules treats sixteen as the carry point, without exception, over a century.

With that discount taken, it is twenty-one independent chances for the conventional ratio to be contradicted, over a century, taken and not one of them taken up. That is a different and weaker claim than an instrument, and a stronger one than an arithmetic chain repeated on a hundred websites. The honest description is: sixteen-to-the-cottah is corroborated by the record's own carry behaviour and stated by nothing.

And it is falsifiable, which the arithmetic chain is not. One Calcutta schedule showing a chittack figure of sixteen or more would end the reading in a line. If you have one, that would be worth more to this page than any of the twenty-one specimens in it.

Reading a Bengal Schedule End to End

Take 5 cottahs 10 chittaks and 34 square feet, from Jayanta Krishna Datta v. Indian Oil Corporation Ltd. (Calcutta High Court, 17 February 2023).

Part	Chittacks	Square feet
5 cottahs	80	3,600
10 chittaks	10	450
34 square feet	0.7556	34
Total	90.7556	4,084

4,084 square feet is 5.6722 cottahs, or 0.0938 acre, a little over a twelfth of an acre.

Note where the exactness comes from. The chatak is the smallest named unit in the Bengal chain, and below it the schedule simply uses square feet. That is why a Calcutta deed can be exact to the square foot without a fourth unit, and why the third place is a plain number rather than a fraction of a chatak. Bihar solves the same problem with the dhur and Assam with the lessa; Bengal stopped naming units and switched to square feet, which is the tidier answer.

Chatak to Square Feet, Square Yards and Square Metres

Square feet = Chatak × 45 · reverse Chatak = Square feet ÷ 45

One chatak is	Exactly	Terminates?
Square feet	45	yes
Square yards	5	yes
Square metres	4.1806368	yes
Square inches	6,480	yes

Five square yards exactly is the fact worth carrying. It means the chatak converts cleanly into the Gaj, Gajam and Square Yard pages' unit, which very few Indian sub-units do.

It is not, though, the only eastern unit that does. The three sub-units below the katha divide as follows:

Unit	Square feet	Square yards	Whole?
Chatak (Bengal)	45	5	yes
Lessa (Assam)	144	16	yes
Dhur (Bihar)	68.0625	7.5625	no

Two of the three are whole square yards and the Bihar one is not. Why the dhur falls out of step is a question this page does not answer. Its 68.0625 square feet is a sixteenth of 1,089, which is a different chain from the one the chatak and the lessa sit in, and tracing it belongs to the Dhur page rather than here. The point that stands is that the eastern chain is not one system: three states, three sub-units, and only two of them share the square yard as a common measure.

Square metres terminates and is ugly. 4.1806368 is exact because the foot is defined as 0.3048 metre exactly. Nobody quotes it; a Kolkata document giving metric will have rounded, and the rounding is worth up to half a square metre on a cottah.

Chatak to Cottah, Bigha and the Eastern Units

The chain above this unit belongs to the Katha page, which sets out where the cottah is 720 square feet and where the katha is something else entirely. This page gives only the chatak's three positions in it.

• 16 chatak = 1 cottah = 720 square feet in West Bengal and the Bengal-facing districts. Reported: see above.
• 320 chatak = 1 Bengal bigha = 14,400 square feet. Twenty cottahs.
• 968 chatak = 1 acre, exactly. A round number nobody quotes and the only clean relation the chatak has to the survey system rather than to the Bengali chain.

The chatak does not meet the Bihar or Assam sub-units. A dhur is 68.0625 square feet and a lessa 144; the chatak is 45. They are three different answers to the same problem, in three states that share a bigha's name and nothing below it. Bihar answers it with a twentieth of the katha called a dhur, and Assam with a lessa.

The Small Units

This is already a small unit (forty-five square feet, about the floor of a large bathroom), so the units below it are given for completeness rather than use. All of them come out exact going down, because 6,480 square inches is a whole number and the metre conversion terminates. Going up is where the recurrence starts, and it starts at the acre.

Four Mistakes That Change the Answer

Searching for "chatak". The Calcutta record says chittack or chittak, 474 documents against 34. This is the single most likely reason a search for a Kolkata property returns nothing.

Taking 45 square feet as a sourced figure. No instrument states it. The record corroborates it twenty-one times over by never contradicting it, which is a different and weaker thing, and any document that turns on the number should cite the schedule in front of you rather than a converter.

Reading a chhatak of rice as a chatak of land. The same word weighs one-sixteenth of a seer. In a nineteenth- or twentieth-century document about produce, rent in kind or a sugar mill's shortages, chhatak is a weight and has no area at all.

Assuming the eastern sub-units interconvert. Chatak 45, dhur 68.0625, lessa 144. Bengal, Bihar and Assam each subdivided their katha differently, and a figure carried across a state line without conversion is wrong by up to a factor of three.

Frequently Asked Questions

What is a chatak in square feet? Forty-five, which is five square yards exactly. It is not a sourced figure: no instrument states it, and this page says so rather than presenting an arithmetic chain as a citation.

How many chatak in a katha or cottah? Sixteen, in West Bengal and the Bengal-facing districts of Jharkhand. Nothing states that either. What supports it is that twenty-one chittack figures read from Calcutta judgments between 1916 and 2025 never once reach sixteen, which is what a carry rule looks like from the outside.

Is it spelt chatak, chittack or chhatak? All three, and the choice matters when you search. The Calcutta High Court's record says chittack (253 documents) or chittak (221); chatak, the spelling on every conversion site, returns 34. Chhatak is mostly the weight, one-sixteenth of a seer, and appears in Patna and Allahabad rather than Calcutta.

Why does my search return nothing? Two likely reasons. You searched chatak rather than chittack; or you used OR between spellings, which Indian Kanoon reads as AND and which returns zero.

How many chatak in an acre? 968, exactly. It is the chatak's one clean relation to the survey system, as against the Bengali chain it was built inside.

Is the chatak the smallest Bengali land unit? It is the smallest named one. Below it a Bengal schedule simply uses square feet, "5 Cottahs 10 Chittaks and 34 square feet", which is why a Calcutta deed is exact to the square foot without a fourth unit. Bihar names a dhur below the katha and Assam a lessa; Bengal stopped naming and switched.

Does the chatak mean the same thing in Assam? The Katha page records that the Barak Valley (Cachar, Karimganj, Hailakandi) subdivides its katha into chataks on the Bengal pattern rather than into lessas. Whether the Barak Valley chatak is the same 45 square feet was searched for and not found, and this page does not assume it.

Sources and Method

Instruments. None. This is the finding, not an omission: no Act, rule, manual or judgment stating the chatak's size or its ratio to the cottah was located, and the value is graded reported throughout this site as a result, a grade this page corrected, the series having previously carried it as sourced.

Judgments, cited in the body by name, court and date. The specimen schedules are drawn from the sixteen matters named below, running between Nanda Lal Roy and Ors. v. Kazi Syed Abdul Aziz (28 February 1916) and Ganesh Saran Agarwala v. Kanhaya Lal (13 June 2025), including Purusattam Das Pashari v. First Land Acquisition Collector (24 November 1975), Rai Bahadur G.V. Swaika Estate P. Ltd. v. M.N. Tewari (8 August 1979), Amal Deb v. Biswanath Mitter (19 August 1983), Ajit Kumar Maulik v. Mukunda Lal Maulik (20 November 1987), Smt. Rinkoo Mitra v. State of West Bengal (2 August 2000), Hall and Anderson Ltd. v. Union of India (6 January 2005), Calcutta Municipal Corporation v. Om Prakash Agarwal (11 July 2008), Tridev Estate v. Board of Wakf (15 December 2009), Jaichandlal Ashok Kumar and Co. Pvt. Ltd. v. Nawab Yossef (22 August 2013), Salil Kumar Basak v. Mrs. Shefali Basak (24 February 2016), Shri Jaichandlal Ashok Kumar v. Nawab Yossuf (10 September 2018), Jayanta Krishna Datta v. Indian Oil Corporation Ltd. (17 February 2023), Dilip Kumar Khandelwal v. Essjay Ericsson (4 October 2023) and Great Eastern Retail Pvt. Ltd. v. Kolkata Municipal Corporation (28 February 2024). For the weight sense: Secretary of State v. Raghubar Dayal-Babu Ram (Allahabad HC, 10 April 1933), Belsand Sugar Co. Ltd. v. The State (Patna HC, 6 May 1964) and Vishnu Sugar Mills Ltd. v. Rameshwar Jute Mills Ltd. (Patna HC, 6 September 1969).

Corpus counts. All run on Indian Kanoon, 10 September 2026, doctypes:kolkata for the Calcutta High Court, with the query printed beside each. Filters were validated by the method set out for the Punjab counts. These counts carry a re-run obligation: the corpus grows, and any republication should re-run all six spellings and re-date them.

The carry-rule evidence, and its limit. Twenty-one chittack figures and twenty square-foot remainders were read from the schedules quoted, together with twenty cottah figures used as a control. None of the chittack figures reaches 16; none of the square-foot remainders reaches 45; and no cottah figure reaches 20 in a schedule that also states bighas, while cottah figures reach 38 where no bigha is stated. This is consistency and not proof, it is stated as such on the page, and a single Calcutta schedule showing sixteen or more chittacks would end the reading.

Arithmetic. Two numbers are stored and everything else is a ratio of them: 45 square feet, and the foot at 0.3048 metre. Because 45 is nine times five, the square-yard column comes out whole and the metric column terminates, and no figure on this page needed a decimal until it was printed. A second script, which did not write the tables, re-derives every cell in the conversion core from the acre and fails the build if it disagrees.

The gaps, listed because they are the shape of this page. Six things were looked for and not found, and the first two are the reason this unit is graded the way it is: an instrument defining the chatak, and a judgment stating the sixteen-to-the-cottah ratio in terms rather than merely obeying it. Then: whether the Barak Valley chatak is the same forty-five square feet; whether any Calcutta schedule has ever been written uncarried, which is the one document that would undo the corroboration above; where the forty-five came from; and whether any West Bengal rule or prescribed form uses the word at all, as against the judgments that use it constantly. None of the six is assumed anywhere on this page.

On the sibling pages. The Katha page owns the Bengal chain, the cottah's regional values and the Barak Valley's position; the Dhur page and Lessa page own the Bihar and Assam sub-units this one is compared against; West Bengal's rules belong with the decimal and what the word decimal does and does not appear in. All are cited here and none is restated.

Chatak Conversion Quick Reference

Conversion	1 Chatak	Note
Acre	0.001033	Recurring; Exact by definition: 43,560 sq ft = 4,840 sq yd
Ankanam	0.625 (Standard)	Region-specific; also 1.25 (Tirupati)
Ares	0.041806368	Exact; 100 m², the metric are
Bigha	0.003125 (West Bengal / Assam / Jharkhand)	Region-specific; also 0.001653 (UP pucca / Bihar / Rajasthan pucca) · 0.004959 (UP kachha (6⅔ biswa)) · 0.006612 (UP kachha (5 biswa) / Uttarakhand hills)
Biswa	0.033058 (UP / Rajasthan pucca)	Region-specific; also 0.051653 (Rajasthan kachha) · 0.099174 (Punjab / Haryana old records) · 0.103306 (Himachal Pradesh)
Biswa Kacha	0.099174 (Punjab / Haryana revenue definition)	Region-specific; also 0.051653 (Rajasthan kachha reading)
Cent	0.103306	Recurring; One hundredth of an acre, exactly
Decimal	0.103306	Recurring; One hundredth of an acre, exactly
Dhur	0.661157 (Bihar / Jharkhand (Patna chain))	Region-specific; also 12.5 (Tripura)
Dismil	0.103306	Recurring; The decimal under another name
Gaj	5	Exact; The square yard, 9 sq ft
Gajam	5	Exact; The square yard in Telugu, 9 sq ft
Ground	0.01875	Exact; Tamil Nadu Urban Land Tax Act 1966, s.2(8-A): "an area comprising two hundred and twenty three square metres (two thousand and four hundred square feet)"
Guntha	0.041322	Recurring; 121 sq yd; 40 guntha = 1 acre exactly
Hectare	0.00041806368	Exact; 10,000 m² exactly
Kanal	0.008264 (Standard (66-inch karam))	Region-specific; also 0.01 (Majha belt (60-inch karam)) · 0.010888 (Doaba belt (57.5-inch karam)) · 0.012346 (Kapurthala belt (54-inch karam))
Katha	0.0625 (West Bengal / Jharkhand)	Region-specific; also 0.033058 (Bihar state standard) · 0.015625 (Assam) · 0.025826 (Bihar (Chhapra))
Killa	0.001033	Recurring; The acre under its Punjabi name
Lessa	0.3125	Exact; The 12-foot mauzadari jar squared (Assam Land Records Manual r.117); 20 to a katha, 100 to a bigha
Marla	0.165289 (Standard (66-inch karam))	Region-specific; also 0.2 (Majha belt (60-inch karam)) · 0.217769 (Doaba belt (57.5-inch karam)) · 0.246914 (Kapurthala belt (54-inch karam))
Murabba	0.0000413 (Punjab canal colony)	Region-specific; also 0.0000661 (Rajasthan (Indira Gandhi Canal))
Nali	0.020833	Recurring; 240 sq yd; 16 mutthi of 135 sq ft. No instrument located states the figure
Perch	0.165289	Recurring; 30.25 sq yd; 160 perches = 1 acre
Pura	0.00078125	Exact; 4 Assam bigha of 14,400 sq ft. The 4:1 ratio is SOURCED -- the Supreme Court states it in 1961 and 1971 and the Gauhati High Court in 1986, 2023, 2024 and 2026 -- but no instrument, judgment or manual states the square-foot figure, which is derived from the Assam bigha
Square Centimeter	41,806.368	Exact; One ten-thousandth of a square metre
Square Feet	45	Exact; The base of this series
Square Inch	6,480	Exact; One 144th of a square foot
Square Karam	1.487603 (Standard (66-inch karam))	Region-specific; also 1.8 (Majha belt (60-inch karam)) · 1.959924 (Doaba belt (57.5-inch karam)) · 2.222222 (Kapurthala belt (54-inch karam))
Square Kilometer	0.0000041806368	Exact; 1,000,000 m²
Square Meter	4.1806368	Exact; The SI unit of area
Square Mile	0.00000161	Recurring; Standards of Weights and Measures Act 1976, Schedule (see s.79): "1 square mile = 2 589 988.110 336 square metres"; 640 acres exactly
Square Yard	5	Exact; 9 sq ft exactly

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Chatak to Acre

1 chatak = 0.001033 acres, recurring. An acre is exact by definition: 43,560 sq ft = 4,840 sq yd.

Computed on the chatak of 45 square feet, which this series grades reported, not sourced: no instrument, judgment or manual located states that figure.

Chatak to Acre Formula

Acre = Chatak ÷ 968

Popular Chatak to Acre Conversions

Chatak	Acre
1	0.001033
2	0.002066
3	0.003099
5	0.005165
10	0.010331
20	0.020661
50	0.051653
100	0.103306
200	0.206612
500	0.516529
1,000	1.033058

Worked Example

5 chatak ÷ 968 = 0.005165 acres

Reverse Conversion: Acre to Chatak

Chatak = Acre × 968

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Chatak to Bigha

1 chatak = 0.003125 bigha on the West Bengal / Assam / Jharkhand definition. The bigha has no single national value. It is also 0.001653 (UP pucca / Bihar / Rajasthan pucca) · 0.004959 (UP kachha (6⅔ biswa)) · 0.006612 (UP kachha (5 biswa) / Uttarakhand hills) and 5 more per chatak. Every definition this series has located is set out with the evidence behind it.

Computed on the chatak of 45 square feet, which this series grades reported, not sourced: no instrument, judgment or manual located states that figure.

Where the bigha fits into the chatak's own record is set out in Chatak to Cottah, Bigha and the Eastern Units above; what follows is the arithmetic.

Chatak to Bigha Formula

Bigha = Chatak × 0.003125 (West Bengal / Assam / Jharkhand)

Popular Chatak to Bigha Conversions

Chatak	Bigha (West Bengal / Assam / Jharkhand)
1	0.003125
2	0.00625
3	0.009375
5	0.015625
10	0.03125
20	0.0625
50	0.15625
100	0.3125
200	0.625
500	1.5625
1,000	3.125

Bigha by Region

Bigha definition	Where it applies	1 bigha in sq ft	Bigha per chatak	Terminates?	Evidence
UP pucca / Bihar / Rajasthan pucca	Purvanchal, Awadh, Patna belt, east Rajasthan	27,225	0.001653	Recurring	sourced
UP kachha (6⅔ biswa)	West Uttar Pradesh	9,075	0.004959	Recurring	sourced
UP kachha (5 biswa) / Uttarakhand hills	West UP, Kumaon and Garhwal hills	6,806.25	0.006612	Recurring	sourced
Rajasthan kachha / Gujarat vigha / Uttarakhand Terai	Marwar, Gujarat, Terai	17,424	0.002583	Recurring	sourced
Madhya Pradesh	Madhya Pradesh	12,000	0.00375	Exact	reported, not sourced
West Bengal / Assam / Jharkhand (the definition used here)	West Bengal, Assam, Ranchi	14,400	0.003125	Exact	sourced
Himachal Pradesh / Haryana Rohtak belt	Himachal Pradesh, Rohtak, Hisar	8,712	0.005165	Recurring	sourced
Punjab / west Haryana	Punjab, kanal belt of Haryana	21,780	0.002066	Recurring	sourced
Haryana Ambala belt	Ambala, Gurugram, Faridabad, Karnal, Panipat	8,100	0.005556	Recurring	sourced

Not every definition above rests on an instrument. 1 of the 9 are marked reported or no instrument located: in circulation and internally consistent, but this series could not find a rule, manual or judgment stating them. What was searched for each is recorded with that unit. Terminates? answers only whether the ratio has a finite decimal, not whether the figure behind it is verified.

To convert against one of the other definitions, multiply by its factor.

Worked Example

5 chatak × 0.003125 = 0.015625 bigha

Reverse Conversion: Bigha to Chatak

Chatak = Bigha × 320 (West Bengal / Assam / Jharkhand)

Chatak = Bigha × 605 (UP pucca / Bihar / Rajasthan pucca) Chatak = Bigha × 605/3 (UP kachha (6⅔ biswa)) Chatak = Bigha × 151.25 (UP kachha (5 biswa) / Uttarakhand hills) Chatak = Bigha × 387.2 (Rajasthan kachha / Gujarat vigha / Uttarakhand Terai) Chatak = Bigha ÷ 0.00375 (Madhya Pradesh) Chatak = Bigha × 193.6 (Himachal Pradesh / Haryana Rohtak belt) Chatak = Bigha × 484 (Punjab / west Haryana) Chatak = Bigha × 180 (Haryana Ambala belt)

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Chatak to Dhur

1 chatak = 0.661157 dhur on the Bihar / Jharkhand (Patna chain) definition. The dhur has no single national value. It is also 12.5 (Tripura) per chatak. Every definition this series has located is set out with the evidence behind it.

Computed on the chatak of 45 square feet, which this series grades reported, not sourced: no instrument, judgment or manual located states that figure.

The ratio is the fraction 80/121, 0.66115702…, which recurs.

Chatak to Dhur Formula

Dhur = Chatak ÷ 1.5125 (Bihar / Jharkhand (Patna chain))

Popular Chatak to Dhur Conversions

Chatak	Dhur (Bihar / Jharkhand (Patna chain))
1	0.661157
2	1.322314
3	1.983471
5	3.305785
10	6.61157
20	13.22314
50	33.057851
100	66.115702
200	132.231405
500	330.578512
1,000	661.157025

Dhur by Region

Dhur definition	Where it applies	1 dhur in sq ft	Dhur per chatak	Terminates?	Evidence
Bihar / Jharkhand (Patna chain) (the definition used here)	Patna belt, and Jharkhand districts counting in the Patna katha	68.0625	0.661157	Recurring	reported, not sourced
Tripura	Tripura	3.6	12.5	Exact	sourced

Not every definition above rests on an instrument. 1 of the 2 are marked reported or no instrument located: in circulation and internally consistent, but this series could not find a rule, manual or judgment stating them. What was searched for each is recorded with that unit. Terminates? answers only whether the ratio has a finite decimal, not whether the figure behind it is verified.

Popular Chatak to Dhur, Tripura

Chatak	Dhur (3.6 sq ft)
1	12.5
2	25
3	37.5
5	62.5
10	125
20	250
50	625
100	1,250
200	2,500
500	6,250
1,000	12,500

Worked Example

5 chatak ÷ 1.5125 = 3.305785 dhur

Reverse Conversion: Dhur to Chatak

Chatak = Dhur × 1.5125 (Bihar / Jharkhand (Patna chain))

Chatak = Dhur × 0.08 (Tripura)

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Chatak to Hectare

1 chatak = 0.00041806368 hectares, exact. A hectare is 10,000 m² exactly.

Computed on the chatak of 45 square feet, which this series grades reported, not sourced: no instrument, judgment or manual located states that figure.

The ratio is the fraction 1,306,449/3,125,000,000, or 0.00041806368 exactly.

Chatak to Hectare Formula

Hectare = Chatak × 0.00041806368

Popular Chatak to Hectare Conversions

Chatak	Hectare
1	0.00041806368
2	0.00083612736
3	0.00125419104
5	0.0020903184
10	0.0041806368
20	0.0083612736
50	0.020903184
100	0.041806368
200	0.083612736
500	0.20903184
1,000	0.41806368

Worked Example

5 chatak × 0.00041806368 = 0.0020903184 hectares

Reverse Conversion: Hectare to Chatak

Chatak = Hectare ÷ 0.00041806368

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Chatak to Katha

1 chatak = 0.0625 katha on the West Bengal / Jharkhand definition. The katha has no single national value. It is also 0.033058 (Bihar state standard) · 0.015625 (Assam) · 0.025826 (Bihar (Chhapra)) and 2 more per chatak. Every definition this series has located is set out with the evidence behind it.

Computed on the chatak of 45 square feet, which this series grades reported, not sourced: no instrument, judgment or manual located states that figure.

Sixteen chatak to the katha in West Bengal. The chatak is the finest rung of the Bengal ladder still written into deeds.

Chatak to Katha Formula

Katha = Chatak × 0.0625 (West Bengal / Jharkhand)

Popular Chatak to Katha Conversions

Chatak	Katha (West Bengal / Jharkhand)
1	0.0625
2	0.125
3	0.1875
5	0.3125
10	0.625
20	1.25
50	3.125
100	6.25
200	12.5
500	31.25
1,000	62.5

Katha by Region

Katha definition	Where it applies	1 katha in sq ft	Katha per chatak	Terminates?	Evidence
Bihar state standard	Patna, Arrah	1,361.25	0.033058	Recurring	sourced
West Bengal / Jharkhand (the definition used here)	Rural West Bengal, Ranchi	720	0.0625	Exact	sourced
Assam	Assam (except Barak Valley)	2,880	0.015625	Exact	sourced
Bihar (Chhapra)	Saran	1,742.4	0.025826	Recurring	sourced
Bihar (Hajipur)	Vaishali	1,901.25	0.023669	Recurring	sourced
Bihar (Bettiah)	West Champaran	3,267	0.013774	Recurring	sourced

To convert against one of the other definitions, multiply by its factor.

Worked Example

5 chatak × 0.0625 = 0.3125 katha

Reverse Conversion: Katha to Chatak

Chatak = Katha × 16 (West Bengal / Jharkhand)

Chatak = Katha × 30.25 (Bihar state standard) Chatak = Katha × 64 (Assam) Chatak = Katha × 38.72 (Bihar (Chhapra)) Chatak = Katha × 42.25 (Bihar (Hajipur)) Chatak = Katha × 72.6 (Bihar (Bettiah))

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Chatak to Lessa

1 chatak = 0.3125 lessa, exact. A lessa is the 12-foot mauzadari jar squared (Assam Land Records Manual r.117); 20 to a katha, 100 to a bigha.

Computed on the chatak of 45 square feet, which this series grades reported, not sourced: no instrument, judgment or manual located states that figure.

The ratio is the fraction 5/16, or 0.3125 exactly.

Chatak to Lessa Formula

Lessa = Chatak × 0.3125

Popular Chatak to Lessa Conversions

Chatak	Lessa
1	0.3125
2	0.625
3	0.9375
5	1.5625
10	3.125
20	6.25
50	15.625
100	31.25
200	62.5
500	156.25
1,000	312.5

Worked Example

5 chatak × 0.3125 = 1.5625 lessa

Reverse Conversion: Lessa to Chatak

Chatak = Lessa × 3.2

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Chatak to Square Feet

1 chatak = 45 square feet, exact. A square foot is the base of this series.

Computed on the chatak of 45 square feet, which this series grades reported, not sourced: no instrument, judgment or manual located states that figure.

45 square feet to the chatak, five square yards. Sixteen make a West Bengal katha and 320 a Bengal bigha.

Where the square foot fits into the chatak's own record is set out in Chatak to Square Feet, Square Yards and Square Metres above; what follows is the arithmetic.

Chatak to Square Feet Formula

Square Feet = Chatak × 45

Popular Chatak to Square Feet Conversions

Chatak	Square Feet
1	45
2	90
3	135
5	225
10	450
20	900
50	2,250
100	4,500
200	9,000
500	22,500
1,000	45,000

Worked Example

5 chatak × 45 = 225 square feet

Reverse Conversion: Square Feet to Chatak

Chatak = Square Feet ÷ 45

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Chatak to Square Meter

1 chatak = 4.1806368 square metres, exact. A square metre is the SI unit of area.

Computed on the chatak of 45 square feet, which this series grades reported, not sourced: no instrument, judgment or manual located states that figure.

The ratio is the fraction 1,306,449/312,500, or 4.1806368 exactly.

Chatak to Square Meter Formula

Square Meter = Chatak × 4.1806368

Popular Chatak to Square Meter Conversions

Chatak	Square Meter
1	4.1806368
2	8.3612736
3	12.5419104
5	20.903184
10	41.806368
20	83.612736
50	209.03184
100	418.06368
200	836.12736
500	2,090.3184
1,000	4,180.6368

Worked Example

5 chatak × 4.1806368 = 20.903184 square metres

Reverse Conversion: Square Meter to Chatak

Chatak = Square Meter ÷ 4.1806368

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Chatak to the Remaining Units

Exactness of the method is not exactness of the result: where a ratio does not terminate, the table says so and the formula gives the fraction.

Chatak to Ankanam

1 chatak = 0.625 ankanam on the Standard definition; 1.25 on the Tirupati definition. Ankanam = Chatak × 0.625 (Standard) · reverse Chatak = Ankanam × 1.6

Chatak	Ankanam (Standard)
1	0.625
2	1.25
3	1.875
5	3.125
10	6.25
20	12.5
50	31.25
100	62.5
200	125
500	312.5
1,000	625

Every definition as a factor. Multiply chatak by the figure shown.

Ankanam definition	Where	Ankanam per chatak
Standard (the definition used here)	Andhra Pradesh, Telangana, parts of Karnataka	0.625
Tirupati	Tirupati and parts of Chittoor	1.25

Chatak to Biswa

1 chatak = 0.033058 biswa on the UP / Rajasthan pucca definition; 0.051653 on the Rajasthan kachha definition · 0.099174 on the Punjab / Haryana old records definition · 0.103306 on the Himachal Pradesh definition. Biswa = Chatak ÷ 30.25 (UP / Rajasthan pucca) · reverse Chatak = Biswa × 30.25

Chatak	Biswa (UP / Rajasthan pucca)
1	0.033058
2	0.066116
3	0.099174
5	0.165289
10	0.330579
20	0.661157
50	1.652893
100	3.305785
200	6.61157
500	16.528926
1,000	33.057851

Every definition as a factor. Multiply chatak by the figure shown.

Biswa definition	Where	Biswa per chatak
UP / Rajasthan pucca (the definition used here)	Uttar Pradesh, east Rajasthan	0.033058
Rajasthan kachha; no instrument located	Marwar	0.051653
Punjab / Haryana old records	Punjab, Haryana	0.099174
Himachal Pradesh; no instrument located	Himachal Pradesh	0.103306

Chatak to Biswa Kacha

1 chatak = 0.099174 biswa kacha on the Punjab / Haryana revenue definition; 0.051653 on the Rajasthan kachha reading definition. Biswa Kacha = Chatak × 12/121 (Punjab / Haryana revenue) · reverse Chatak = Biswa Kacha × 121/12

Chatak	Biswa Kacha (Punjab / Haryana revenue)
1	0.099174
2	0.198347
3	0.297521
5	0.495868
10	0.991736
20	1.983471
50	4.958678
100	9.917355
200	19.834711
500	49.586777
1,000	99.173554

Every definition as a factor. Multiply chatak by the figure shown.

Biswa Kacha definition	Where	Biswa Kacha per chatak
Punjab / Haryana revenue definition (the definition used here)	Punjab, Haryana	0.099174
Rajasthan kachha reading; no instrument located	Marwar	0.051653

Chatak to Kanal

1 chatak = 0.008264 kanal on the Standard (66-inch karam) definition; 0.01 on the Majha belt (60-inch karam) definition · 0.010888 on the Doaba belt (57.5-inch karam) definition · 0.012346 on the Kapurthala belt (54-inch karam) definition. Kanal = Chatak ÷ 121 (Standard (66-inch karam)) · reverse Chatak = Kanal × 121

Chatak	Kanal (Standard (66-inch karam))
1	0.008264
2	0.016529
3	0.024793
5	0.041322
10	0.082645
20	0.165289
50	0.413223
100	0.826446
200	1.652893
500	4.132231
1,000	8.264463

Every definition as a factor. Multiply chatak by the figure shown.

Kanal definition	Where	Kanal per chatak
Standard (66-inch karam) (the definition used here)	Most of Punjab, Haryana, Himachal, J&K	0.008264
Majha belt (60-inch karam); reported, not sourced	Amritsar, Gurdaspur, Tarn Taran	0.01
Doaba belt (57.5-inch karam); reported, not sourced	Jalandhar, Kapurthala and Hoshiarpur, and Kangra in Himachal	0.010888
Kapurthala belt (54-inch karam); reported, not sourced	Parts of Kapurthala	0.012346

Chatak to Marla

1 chatak = 0.165289 marla on the Standard (66-inch karam) definition; 0.2 on the Majha belt (60-inch karam) definition · 0.217769 on the Doaba belt (57.5-inch karam) definition · 0.246914 on the Kapurthala belt (54-inch karam) definition · 0.2 on the HSVP urban estate definition. Marla = Chatak ÷ 6.05 (Standard (66-inch karam)) · reverse Chatak = Marla × 6.05

Chatak	Marla (Standard (66-inch karam))
1	0.165289
2	0.330579
3	0.495868
5	0.826446
10	1.652893
20	3.305785
50	8.264463
100	16.528926
200	33.057851
500	82.644628
1,000	165.289256

Every definition as a factor. Multiply chatak by the figure shown.

Marla definition	Where	Marla per chatak
Standard (66-inch karam) (the definition used here)	Most of Punjab, Haryana, Himachal, J&K	0.165289
Majha belt (60-inch karam); reported, not sourced	Amritsar, Gurdaspur, Tarn Taran	0.2
Doaba belt (57.5-inch karam); reported, not sourced	Jalandhar, Kapurthala and Hoshiarpur, and Kangra in Himachal	0.217769
Kapurthala belt (54-inch karam); reported, not sourced	Parts of Kapurthala	0.246914
HSVP urban estate	Haryana urban estates	0.2

Chatak to Murabba

1 chatak = 0.0000413 murabba on the Punjab canal colony definition; 0.0000661 on the Rajasthan (Indira Gandhi Canal) definition. Murabba = Chatak ÷ 24,200 (Punjab canal colony) · reverse Chatak = Murabba × 24,200

Chatak	Murabba (Punjab canal colony)
1	0.0000413
2	0.0000826
3	0.000124
5	0.000207
10	0.000413
20	0.000826
50	0.002066
100	0.004132
200	0.008264
500	0.020661
1,000	0.041322

Every definition as a factor. Multiply chatak by the figure shown.

Murabba definition	Where	Murabba per chatak
Punjab canal colony (the definition used here); reported, not sourced	Punjab, Haryana canal colonies	0.0000413
Rajasthan (Indira Gandhi Canal)	Sri Ganganagar, Hanumangarh, Bikaner, Jaisalmer	0.0000661

Chatak to Square Karam

1 chatak = 1.487603 square karam on the Standard (66-inch karam) definition; 1.8 on the Majha belt (60-inch karam) definition · 1.959924 on the Doaba belt (57.5-inch karam) definition · 2.222222 on the Kapurthala belt (54-inch karam) definition. Square Karam = Chatak × 180/121 (Standard (66-inch karam)) · reverse Chatak = Square Karam × 121/180

Chatak	Square Karam (Standard (66-inch karam))
1	1.487603
2	2.975207
3	4.46281
5	7.438017
10	14.876033
20	29.752066
50	74.380165
100	148.760331
200	297.520661
500	743.801653
1,000	1,487.603306

Every definition as a factor. Multiply chatak by the figure shown.

Square Karam definition	Where	Square Karam per chatak
Standard (66-inch karam) (the definition used here)	Most of Punjab, Haryana, Himachal, J&K	1.487603
Majha belt (60-inch karam); reported, not sourced	Amritsar, Gurdaspur, Tarn Taran	1.8
Doaba belt (57.5-inch karam); reported, not sourced	Jalandhar, Kapurthala and Hoshiarpur, and Kangra in Himachal	1.959924
Kapurthala belt (54-inch karam); reported, not sourced	Parts of Kapurthala	2.222222

Chatak to Ares

1 chatak = 0.041806368 ares (exact). Ares = Chatak × 0.041806368 · reverse Chatak = Ares ÷ 0.041806368

Chatak	Ares
1	0.041806368
2	0.083612736
3	0.125419104
5	0.20903184
10	0.41806368
20	0.83612736
50	2.0903184
100	4.1806368
200	8.3612736
500	20.903184
1,000	41.806368

Chatak to Cent

1 chatak = 0.103306 cent (recurring). Cent = Chatak ÷ 9.68 · reverse Chatak = Cent × 9.68

Chatak	Cent
1	0.103306
2	0.206612
3	0.309917
5	0.516529
10	1.033058
20	2.066116
50	5.165289
100	10.330579
200	20.661157
500	51.652893
1,000	103.305785

Chatak to Gaj

1 chatak = 5 gaj (exact). Gaj = Chatak × 5 · reverse Chatak = Gaj × 0.2

Chatak	Gaj
1	5
2	10
3	15
5	25
10	50
20	100
50	250
100	500
200	1,000
500	2,500
1,000	5,000

Chatak to Ground

1 chatak = 0.01875 ground (exact). Ground = Chatak × 0.01875 · reverse Chatak = Ground ÷ 0.01875

Chatak	Ground
1	0.01875
2	0.0375
3	0.05625
5	0.09375
10	0.1875
20	0.375
50	0.9375
100	1.875
200	3.75
500	9.375
1,000	18.75

Chatak to Guntha

1 chatak = 0.041322 guntha (recurring). Guntha = Chatak ÷ 24.2 · reverse Chatak = Guntha × 24.2

Chatak	Guntha
1	0.041322
2	0.082645
3	0.123967
5	0.206612
10	0.413223
20	0.826446
50	2.066116
100	4.132231
200	8.264463
500	20.661157
1,000	41.322314

Chatak to Nali

1 chatak = 0.020833 nali (recurring). Nali = Chatak ÷ 48 · reverse Chatak = Nali × 48

Chatak	Nali
1	0.020833
2	0.041667
3	0.0625
5	0.104167
10	0.208333
20	0.416667
50	1.041667
100	2.083333
200	4.166667
500	10.416667
1,000	20.833333

Chatak to Pura

1 chatak = 0.00078125 pura (exact). Pura = Chatak × 0.00078125 · reverse Chatak = Pura × 1,280

Chatak	Pura
1	0.00078125
2	0.0015625
3	0.00234375
5	0.00390625
10	0.0078125
20	0.015625
50	0.0390625
100	0.078125
200	0.15625
500	0.390625
1,000	0.78125

Chatak to Square Centimeter

1 chatak = 41,806.368 square centimeter (exact). Square Centimeter = Chatak × 41,806.368 · reverse Chatak = Square Centimeter ÷ 41,806.368

Chatak	Square Centimeter
1	41,806.368
2	83,612.736
3	125,419.104
5	209,031.84
10	418,063.68
20	836,127.36
50	2,090,318.4
100	4,180,636.8
200	8,361,273.6
500	20,903,184
1,000	41,806,368

Chatak to Square Inch

1 chatak = 6,480 square inch (exact). Square Inch = Chatak × 6,480 · reverse Chatak = Square Inch ÷ 6,480

Chatak	Square Inch
1	6,480
2	12,960
3	19,440
5	32,400
10	64,800
20	129,600
50	324,000
100	648,000
200	1,296,000
500	3,240,000
1,000	6,480,000

Chatak to Square Kilometer

1 chatak = 0.0000041806368 square kilometer (exact). Square Kilometer = Chatak × 0.0000041806368 · reverse Chatak = Square Kilometer ÷ 0.0000041806368

Chatak	Square Kilometer
1	0.0000041806368
2	0.0000083612736
3	0.0000125419104
5	0.000020903184
10	0.000041806368
20	0.000083612736
50	0.00020903184
100	0.00041806368
200	0.00083612736
500	0.0020903184
1,000	0.0041806368

Chatak to Square Mile

1 chatak = 0.00000161 square mile (recurring). Square Mile = Chatak ÷ 619,520 · reverse Chatak = Square Mile × 619,520

Chatak	Square Mile
1	0.00000161
2	0.00000323
3	0.00000484
5	0.00000807
10	0.0000161
20	0.0000323
50	0.0000807
100	0.000161
200	0.000323
500	0.000807
1,000	0.001614

Chatak to the Units That Are the Same Area

Six of the thirty-two units are two names for one area with another, so their figures are identical to the last digit.

Chatak to Decimal

1 chatak = 0.103306 decimal. A decimal and a cent are the same area, 435.6 square feet, so any Chatak figure converts to the same number of either. Decimal = Chatak ÷ 9.68 · reverse Chatak = Decimal × 9.68

Chatak to Dismil

1 chatak = 0.103306 dismil. A dismil and a cent are the same area, 435.6 square feet, so any Chatak figure converts to the same number of either. Dismil = Chatak ÷ 9.68 · reverse Chatak = Dismil × 9.68

Chatak to Gajam

1 chatak = 5 gajam. A gajam and a gaj are the same area, 9 square feet, so any Chatak figure converts to the same number of either. Gajam = Chatak × 5 · reverse Chatak = Gajam × 0.2

Chatak to Killa

1 chatak = 0.001033 killa. A killa and an acre are the same area, 43,560 square feet, so any Chatak figure converts to the same number of either. Killa = Chatak ÷ 968 · reverse Chatak = Killa × 968

Chatak to Perch

1 chatak = 0.165289 perches. A perch and a marla are the same area, 272.25 square feet, so any Chatak figure converts to the same number of either. Perch = Chatak ÷ 6.05 · reverse Chatak = Perch × 6.05

Chatak to Square Yard

1 chatak = 5 square yards. A square yard and a gaj are the same area, 9 square feet, so any Chatak figure converts to the same number of either. Square Yard = Chatak × 5 · reverse Chatak = Square Yard × 0.2

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The tables above are arithmetic, and for a chatak the arithmetic is the easy half. What decides whether the figure you started with is the right one to convert at all is Five Spellings, and the Rarest Is the Famous One.