Length conversion
Millimetre to Inch
One millimetre is 0.03937 inches. Enter any value below to convert it instantly, or use the reference table further down for the numbers you need most often.
Conversion rate
1 mm = 0.03937 in
in = mm × 0.03937
1 mm = 0.03937 in
Reference
Millimetre to Inch table
The values people look up most often, rounded for practical use.
| Millimetre (mm) | Inch (in) | Written out |
|---|---|---|
| 1 mm | 0.03937 in | 1 millimetres = 0.03937 inches |
| 2 mm | 0.07874 in | 2 millimetres = 0.07874 inches |
| 3 mm | 0.11811 in | 3 millimetres = 0.11811 inches |
| 5 mm | 0.19685 in | 5 millimetres = 0.19685 inches |
| 10 mm | 0.3937 in | 10 millimetres = 0.3937 inches |
| 15 mm | 0.59055 in | 15 millimetres = 0.59055 inches |
| 20 mm | 0.7874 in | 20 millimetres = 0.7874 inches |
| 25 mm | 0.98425 in | 25 millimetres = 0.98425 inches |
| 50 mm | 1.968504 in | 50 millimetres = 1.968504 inches |
| 100 mm | 3.937008 in | 100 millimetres = 3.937008 inches |
| 250 mm | 9.84252 in | 250 millimetres = 9.84252 inches |
| 500 mm | 19.68504 in | 500 millimetres = 19.68504 inches |
| 1,000 mm | 39.37008 in | 1,000 millimetres = 39.37008 inches |
How to convert millimetres to inches
Multiply the number of millimetres by 0.03937. That is the whole calculation: in = mm × 0.03937. To go back the other way, divide instead, or multiply by 25.4.
Worked example: 12 millimetres × 0.03937 = 0.47244 inches.
Where this conversion comes up
Length conversions show up constantly in printing, DIY, engineering drawings and anything bought from a country using the other measurement system. If you are converting in order to set a page or grid size, the graph paper generator accepts spacing in millimetres directly — and the on-screen ruler lets you check a printed result against both scales.
Quick answers
- 1 millimetre = 0.03937 inches
- 2 millimetres = 0.07874 inches
- 5 millimetres = 0.19685 inches
- 10 millimetres = 0.3937 inches
- 100 millimetres = 3.937008 inches
More conversions
Other length conversions
Answers
Frequently asked questions
in = mm × 0.03937. The converter above applies it for you, but the formula is useful in a spreadsheet — put your value in column A and the formula in column B.Related tools
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