Millimeters to Inches Converter (mm to in)
Millimeters are the workshop unit for engineering drawings, fasteners and sheet material. There are exactly 25.4 millimeters in one inch, so divide millimeters by 25.4.
Convert units
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1 mm = 0.03937007874 in
Calculation working
- Result = input × source factor ÷ target factor
- 1 × 0.001 ÷ 0.0254 = 0.0393700787401575 in
- Factors refer to the same base quantity. Rounding is applied to the display, not intermediate calculations.
Display: 10 significant digits. More digits do not make the original measurement more accurate.
Try a practical example
Batch conversion
One value per line, up to 200. Uses the selected mm → in units. Invalid rows stay visible in the results and CSV.
Compare all units
Using this length converter
Check drawing dimensions, product sizes, travel distances or a measured length without changing the physical distance.
The foot and inch here are the international definitions. Convert the measured dimension first, then apply any tolerance or construction allowance separately.
Check before using the result
- A length factor cannot convert square feet or cubic feet. Select Area or Volume for those quantities.
- A value written as 5 ft 6 in must first be combined into one unit: 66 in or 5.5 ft. Do not enter 5.6 ft.
Definitions and method: NIST: unit conversion factors and rounding. Calculations use double-precision arithmetic; the display precision can be adjusted above.
Millimeters to Inches conversion chart
| Millimeter (mm) | Inch (in) |
|---|---|
| 1 | 0.03937008 |
| 2 | 0.07874016 |
| 3 | 0.11811024 |
| 5 | 0.19685039 |
| 10 | 0.39370079 |
| 12 | 0.47244094 |
| 16 | 0.62992126 |
| 20 | 0.78740157 |
| 25 | 0.98425197 |
| 50 | 1.96850394 |
| 100 | 3.93700787 |
| 300 | 11.81102362 |
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