How Many centimetres make an inch?

2.5 centimetres(cm) equals 1 inch. Both ‘centimetres’ and ‘inches’ are units of measurement.

Now let’s discover one easy way to convert inches (inch) to centimetres (cm). Moreover, the world uses both cm and inch interchangeably. Therefore, it’s necessary to learn to use them.

Convert Inches Into Centimetres

3 simple steps to do this:-

  • Use a calculator or an app to calculate.

  • Type the number of ‘inches’ in the calculator that you want to convert into cm

  • Next, multiply(x) 2.54 and press the equal(=) symbol

Example: Suppose we want to know the value of 5 inches in centimetres.

Use a calculator and multiply 5 with 2.54. The results equal 12.7cm. Which means 5 inches is equal to 12.7cm.

Convert Centimetres into Inch

Similarly, follow these 3 simple steps for ‘cm’ to ‘inch’ conversion:-

  • Open up a calculating app.

  • Type the number of ‘cm’ in the calculator that you want to convert into inches

  • Next, divide that number by 2.54 and press the equal(=) symbol.

Example: Suppose we want to know the value of 10 centimetres in inches.

Use a calculator and divide 10 by 2.54. The results equal 3.93 inches. Which means 10 cm is equal to 3.93 inches.

Additionally, you should know what really an inch or centimetre is. Furthermore, it’s essential to learn where and when the world uses centimetres or inches.

Important differences between ‘inches’ & ‘Centimetres’

Inches and centimetres measure length differently. Here are the differences.

Centimetre is denoted by the symbol of ‘cm’. For example, 1cm and 30cm. Whereas, inches is denoted by ‘in’ or frequently with the symbol ( ” ). For example, 12in or 12”.

Besides this, a centimetre is a smaller unit of measurement than an inch.

Let’s go deep and dive into the definitions and history of ‘cm’ and ‘inch’. This is how we can understand the real differences.

The real meaning of ‘centimetre’

A centimeter (cm) is a metric unit of length, equal to one one-hundredth of a meter. It's widely used to measure length and height.

Imagine you have a 1 meter long rope. Now, if you cut that rope into one-hundred equal segments, that is, the length of each and every piece should strictly be equal in length to one another. Now you can say that each segment of the rope is 1 cm long.

You can also use a ruler to figure out how long a centimeter is. Additionally, 1 cm is equal to 10 millimeters or 10mm.

The "centi" in centimetre comes from the SI prefix for 1/100. It used to be the base unit for length in the old CGS system, which is no longer favoured. The word “SI” represents an International System of Measurements which is a convenient way to express mathematical measurements easily. Similarly, CGS is also a system of expressing measurement units including ‘cm’ and ‘inch’.

Let’s learn about ‘Inch’

An inch is a unit of length used in the US customary and imperial systems. It's commonly used to measure electronic devices like laptops, TVs, and mobile phone screens.

Definition: An inch is a customary unit of length equal to 1/12th of a foot. You can remember this in much simpler terms. Imagine that you take a rope which is 1 foot long and decide to cut it into exactly 12 equal segments. Then every segment of that rope which you will be holding in your hand would be considered to be 1 inch long.

Hope, this way of understanding is much smarter and simpler than the scientific definitions available out there. There are many objects that are 1 inch long. Take a look at them and then you will be able to feel what an inch looks like. Eg: a paper clip is roughly 1 inch.

Here, the US customary and imperial systems refer to the two different systems of measurement used primarily for length and weight in the United States and some other countries. However, the history of inch dates back to the 7th century. Ancient definitions of an inch are not used anymore in this modern age.


In summary, understanding the relationship between inches and centimetres, their distinctions, and historical context is essential for effective measurement comprehension. And also makes you smarter and feel confident about yourself.


Which is bigger than cm?

An inch is longer than a centimeter. Both are measurement units. To understand this, you need to know how measurements work. The first thing to keep in mind is to know what is the smallest unit of measurement is. For simplicity, ‘mm’ is generally considered the smallest.

Therefore, if we measure both the units, i.e., inch and cm, we’ll be able to understand which unit is bigger than the other.

  • 1 cm = 10mm
  • 1 inch = 25.4mm (2.54cm)
  • Therefore, 1 inch > 1 cm

How do you write 5 feet 2 inches?

5 feet 2 inches is the same as,  5’ 2”

Writing feet and inches in numerical terms is surprisingly simple. To write 5 feet 2 inches numerically, find out the symbols used to denote both ‘feet’ and ‘inch’.

Feet is denoted by a single prime ( ’ ). An inch is denoted by a double prime, ( ” ).

So, 5 feet 2 inches means in this case, 5’ 2”

Is 1 ruler 12 inches?

No, is the answer here. There are 2 kinds of rulers used commonly by us. One is 30 cm long and the other is 15 cm small. Therefore the long scale is 11.811 inches long and the small scale is 5.9 inches long.

Calculations are shown here:

  • 1 cm = 1/ 2.54 inch.,
  • 30cm = 30 x (1/2.54) = 11.811 inches
  • Similarly,  15 cm = 15/2.54 inches = 5.9 inch

What is below 1 cm?

A millimeter (mm) is the smallest unit in the C.G.S. system. And therefore ‘mm’ is smaller than centimeter ‘cm’.

Furthermore, 1 cm = 10 mm

What is 1 cm on a ruler?

Take a ruler and identify the longest vertical lines on it, those are known as centimeters. The ones that are numbered as well. Such as 0,1,2,3 and so on. Therefore, the second longest vertical line on a ruler after zero has to be 1 cm.

The ruler generally contains two kinds of vertical lines marked on it. The shorter array of lines are millimeters and the longer lines are centimeters. Start counting the shorter lines and start with the first short line. Then count go on counting until you reach the 10 lines. You’ll notice that the 10th line is longer. Moreover, it is the first of the long lines. For that reason, it is for sure taken as 1 cm.

How do you write 1 inch?

Generally, an inch is denoted by a double prime (”) or (in). Hence 1 inch is written as 1” or 1 in.

How long is a thumb?

The length of a thumb can be different for different people. Generally, it is 2 inches or 2”.

But if you want to measure how long your thumb is, you can get a rough estimate using a ruler or a flexible measuring tape or scale. Thus, we have briefed the topic for your knowledge.


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