# How long is a centimeter on a ruler?

It is a difficult question, because it is not easy to explain how long a centimetre. This unit is contractual which means that people around the world have agreed that 1 centimetre is a specific length.

Generally, the centimetre is approximately **equal to** the length of adult fingernails. We can also present a centimetre in inches. To do this we have to convert **cm to inch**.

The **inch to cm ratio **says that **1 inch is equal to 2.54 cm**. According to this information when we divide 1 by 2.54 we will get the result which will tell us **how many inches in a cm** are.

So, the mentioned dividing would look like this:

**1 / 2.54 = 0.3937007870 inch.**

It means that 1 cm on a ruler is equal to 0.3937007870 inch.

## Inch to cm conversion

What do you have to do when you have a ruler with inches, but you want to know the length of an object in centimetres? In this case you have to **change from inches to cm**. **Conversion for inch to cm** is based on the mentioned above an **inch to cm ratio** and the general** inch to cm equation**. This equation looks like this:

**The length in inches * 2.54 = The length in centimetres.**

It is all you have to remember to do manual **inch to cm conversion**. According to this knowledge when you would want to convert, for instance, **58 inches to cm**, you would have to multiply 58 inches by 2.54 to get the right result in centimetres:

**58 inches * 2.54 = 147.32 cm.**

The same principle concerns all** inch to cm equations** you want to calculate. It is quite a simple thing, but you can have problems with fast manual calculations, if you want to convert values in **inches to cm** with a lot of decimal numbers. Let’s convert, for example, **123.568 inches to cm**:

**123.568 inches * 2.54 cm = 313.86272 cm.**

This equation is more difficult than the previous one, because no one person can calculate a lot of decimal numbers quickly. There is a need to use paper and pen to write all calculations to don’t make any mistakes. It can be tiring to convert **inches to cm** manually when it concerns high values with a lot of decimal numbers. But, there is another way to do similar **inch to cm conversions** easily.

## An online inch to cm calculator

The mentioned way is to use an online **inch to cm calculator** like our installed on this website. Such a device can calculate any **inch to cm equation **very quickly and doesn’t make mistakes, even when it has to convert very high values in **inches to cm** with a lot of decimal numbers.

It works just like a physical, traditional calculator. You have to type the value in inches you want to convert and then you have to press enter. The internal system of the web-based **inch to cm converter** will calculate everything on the basis of the described above **inch to cm ratio** and the general **inch to cm equation**. You will see the right result immediately after typing the value.

**It is a very comfortable way to do the conversion for inch to cm. If you want to convert inches to cm easily and quickly, check our online device for free. You will forget about tiring manual calculations.**