Millimetres to Inches Converter
Type a value in millimetres to see it in inches. It works both ways: type in the inches box to convert back.
Formula
To convert millimetres to inches, divide by 25.4 (the same as multiplying by 0.03937007874).
1 mm = 0.0393700787402 in and 1 in = 25.4 mm.
Millimetres to inches table
| Millimetres | Inches |
|---|---|
| 1 mm | 0.03937008 in |
| 2 mm | 0.07874016 in |
| 3 mm | 0.1181102 in |
| 5 mm | 0.1968504 in |
| 6 mm | 0.2362205 in |
| 8 mm | 0.3149606 in |
| 10 mm | 0.3937008 in |
| 12 mm | 0.4724409 in |
| 15 mm | 0.5905512 in |
| 20 mm | 0.7874016 in |
| 25 mm | 0.984252 in |
| 50 mm | 1.968504 in |
| 100 mm | 3.937008 in |
Worked examples
2 mm in inches
2 mm
0.07874016 in
2 × 0.03937007874 = 0.07874015748
10 mm in inches
10 mm
0.3937008 in
10 × 0.03937007874 = 0.3937007874
50 mm in inches
50 mm
1.968504 in
50 × 0.03937007874 = 1.968503937
About Millimetres to Inches Converter
This converter turns millimetres into inches as you type, and works the other way too: type in the inches box to convert back. To convert millimetres to inches, divide by 25.4 (the same as multiplying by 0.03937007874). For example, 2 mm is 0.07874016 in, and 10 mm is 0.3937008 in.
The UK uses metric units for most measurements, but road signs are in miles and yards, and many people still think of height in feet and inches, so length conversions come up every day. Both units have exact definitions, so the converter gives an exact result, rounded only for display. Use the table below for common values, or set the decimal places to round the answer for a form or a label.
How to use Millimetres to Inches Converter
- Type the amount in millimetres in the first box.
- Read the answer in inches in the second box and in the result line below.
- To convert the other way, type in the inches box instead, or use the swap button to open the inches to millimetres page.
- Choose a number of decimal places if you need a rounded figure, then copy the result line.
Common uses
- Checking a product size listed in another system
- Following plans, patterns or instructions from abroad
- Converting a height or a distance for a form
- Helping with homework that mixes metric and imperial units
Frequently asked questions
How many inches are in one millimetre?
There are 0.03937007874 inches in one millimetre. This figure is exact, because both units have fixed definitions.
How do I convert millimetres to inches?
To convert millimetres to inches, divide by 25.4 (the same as multiplying by 0.03937007874). For example, 50 mm is 1.968504 in.
How do I convert inches to millimetres?
Going the other way, multiply by 25.4. The inches to millimetres converter does this for you.
What is 20 mm in inches?
20 mm is 0.7874016 in.
Why does the UK still use miles?
Road distances and speed limits stayed in miles and yards when the UK moved to metric units for trade and science. The Weights and Measures Act allows miles, yards, feet and inches for road traffic signs, so you will meet both systems.