Millimeters to Inches Converter
1 millimeter ≈ 0.0393700787 inches
1 millimeter equals 0.0393701 inches
How to convert millimeters to inches
Feet, inches, yards and miles use the international foot (0.3048 m). Older US survey-foot records use a different definition; check the survey document before applying these factors.
in = mm × 0.03937007874One millimeter is 0.03937007874 inches, so a single multiplication converts any value.
0.393701 in ≈ 10 × 0.03937007874Millimeters to inches conversion table
Common values in millimeters, converted to inches.
| Millimeters (mm) | Inches (in) |
|---|---|
| 1 | 0.039370079 |
| 2 | 0.078740157 |
| 3 | 0.11811024 |
| 4 | 0.15748031 |
| 5 | 0.19685039 |
| 10 | 0.39370079 |
| 20 | 0.78740157 |
| 25 | 0.98425197 |
| 50 | 1.9685039 |
| 100 | 3.9370079 |
| 250 | 9.8425197 |
| 500 | 19.685039 |
| 1,000 | 39.370079 |
About these units
millimetermm
One thousandth of a metre, the usual unit for engineering drawings.
inchin
Exactly 2.54 centimetres since the 1959 international agreement.
Reference: International Yard and Pound Agreement (1959).
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.