Convert Millimetres to Inches (mm to in)
Enter a value in millimetres to convert it to inches instantly.
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Convert Millimetres to Inches (mm to in)
Millimetres (mm) are the metric unit for very small lengths used in engineering and DIY; inches (in) are the imperial equivalent. One millimetre equals 0.03937 in, so the calculator above gives the answer the instant you type.
The formula
inches = millimetres × 0.03937. To convert the other way, divide by 0.03937 (or use the swap button above).
Worked example
To convert 25 mm to inches: 25 × 0.03937 = 0.98425 in. 25.4 mm = exactly 1 inch.
Millimetres to Inches conversion table
| mm | in |
|---|---|
| 1 mm | 0.03937 in |
| 5 mm | 0.19685 in |
| 10 mm | 0.3937 in |
| 25 mm | 0.98425 in |
| 50 mm | 1.96851 in |
| 100 mm | 3.93701 in |
| 150 mm | 5.90551 in |
| 200 mm | 7.87402 in |
| 300 mm | 11.81103 in |
| 500 mm | 19.68505 in |
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Frequently Asked Questions
1 mm = 0.03937 in.
25 × 0.03937 = 0.98425 in.
Multiply the number of millimetres by 0.03937. 25.4 mm = exactly 1 inch.