Millimeters to Inches Converter
1 millimeter = 0.03937008 inches
Type a value in either box: the conversion between millimeters (mm) and inches (in) updates instantly.
Inches to Millimeters Converter
Good to know
Drill bits, wrenches and bolts come in metric (mm) and imperial (fractions of an inch) sizes. Exactly 25.4 mm make one inch.
How to convert millimeters to inches
To convert millimeters to inches, multiply the number of millimeters by 0.03937008. To go the other way, multiply inches by 25.4.
in = mm × 0.03937008
Worked examples
- 1 mm = 0.03937008 in
- 10 mm = 0.3937008 in
- 25.4 mm = 1 in
- 100 mm = 3.937008 in
Millimeters to Inches conversion table
| Millimeters (mm) | Inches (in) |
|---|---|
| 1 mm | 0.03937008 in |
| 2 mm | 0.07874016 in |
| 3 mm | 0.1181102 in |
| 4 mm | 0.1574803 in |
| 5 mm | 0.1968504 in |
| 6 mm | 0.2362205 in |
| 7 mm | 0.2755906 in |
| 8 mm | 0.3149606 in |
| 9 mm | 0.3543307 in |
| 10 mm | 0.3937008 in |
| 15 mm | 0.5905512 in |
| 20 mm | 0.7874016 in |
| 25 mm | 0.984252 in |
| 30 mm | 1.181102 in |
| 40 mm | 1.574803 in |
| 50 mm | 1.968504 in |
| 75 mm | 2.952756 in |
| 100 mm | 3.937008 in |
| 250 mm | 9.84252 in |
| 500 mm | 19.68504 in |
| 1,000 mm | 39.37008 in |
About the units
Millimeters (mm)
The millimeter (mm) is one thousandth of a meter. It is used for precise measurements in engineering, hardware and rainfall.
Inches (in)
The inch (in) is defined as exactly 2.54 centimeters. It is used in the US and UK for height, screen sizes, tools and construction.
Frequently asked questions
How do I convert millimeters to inches?
in = mm × 0.03937008What is 10 mm in inches?
How many inches are in a millimeter?
How many millimeters are in an inch?
Conversion factors use exact international definitions where they exist (for example 1 inch = 2.54 cm and 1 lb = 0.45359237 kg). Results are rounded for display only.