Metric to Inches Calculator

Created by Arturo Barrantes
Reviewed by Dominika Miszewska, MD, PhD candidate
Last updated: Mar 11, 2022

In the handy metric to inches calculator, we convert mm to inches and the following metric units:

  • centimeter,
  • meter,
  • kilometer.

We will also show how to use our metric to inches calculator, so you won't ever get lost again with the imperial system.

What is the metric system? Meter definition

The metric measurement system is a worldwide accepted way of defining the distance between two points. It is based on the meter. Some of them are:

  • picometers (pm)
  • nanometers (nm)
  • micrometers (μm)
  • millimeter (mm)
  • centimeters (cm)
  • decimeters (dm)
  • meters (m)
  • kilometers (km)

But, what is the meter? The meter definition considers it to be 1/299,792,458 of the distance that light travels in a vacuum space in one second.

However, it is not the only way of measuring distance. The imperial measurement system also exists, which rules in US and UK. One of their most relevant units is the inch.

How to convert metric values to inches?

Relevant organizations have changed the inch definition through history; however, the current one is:

1 inch = 25.4 mm, which, if we want to express it in centimeters:
1 inch = 2.54 cm.

Also, if we use our metric to inches calculator, we will discover that:

1 inch = 0.0254m
1 km = 0.0000254

How to use our metric to inches calculator?

Our metric to inches calculator is pretty easy to use.

  1. Type the value in the metric unit of your preference. Our tool will indicate the inch value.
  2. Also, you can start typing the inch value. Metric values magically will appear.

Lets see some examples:

  • Convert in to mm:
    1/4 inch = 0.25 in
    0.25 in * 25.4 mm / in = 6.35 mm

  • Convert 10 mm to inches:
    10 mm / 25.4 mm per inch = 0.3937 inches

Note that when we want to convert mm to inches, we divide by 25.4. Contrarily, the other way around requires a multiplication per 25.4. You can use the conversion list in the section above or forget about it and use our metric to inches calculator.


How many mm are in an inch?

25.4mm You can check our metric to inches calculator and seek for inch definition. Also, you can calculate as follows:

  1. Remember that 1 inch is 2.54 cm.
  2. Convert 2.54 cm to millimeters by multiplying that value by 10. Therefore, 1 inch is 25.4 mm.

How much it is 10 mm to inches?

0.3937. Let's see how to calculate it.

  1. Remember how many mm are in 1 inch? Yes, 25.4. There are 25.4 mm in an inch. Therefore, we divide 10 mm by 25.4 mm.
  2. The result is the amount in inches we are looking for.
Arturo Barrantes
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