Inches to Millimeters
Convert inches to millimeters instantly. 1 in = 25.4 mm
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Quick answers
- 1 in = 25.4 mm
- 5 in = 127 mm
- 10 in = 254 mm
- 20 in = 508 mm
- 50 in = 1,270 mm
- 100 in = 2,540 mm
Inches to Millimeters conversion table
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 4 in | 101.6 mm |
| 5 in | 127 mm |
| 6 in | 152.4 mm |
| 7 in | 177.8 mm |
| 8 in | 203.2 mm |
| 9 in | 228.6 mm |
| 10 in | 254 mm |
| 15 in | 381 mm |
| Inches (in) | Millimeters (mm) |
|---|---|
| 20 in | 508 mm |
| 25 in | 635 mm |
| 30 in | 762 mm |
| 40 in | 1,016 mm |
| 50 in | 1,270 mm |
| 75 in | 1,905 mm |
| 100 in | 2,540 mm |
| 250 in | 6,350 mm |
| 500 in | 12,700 mm |
| 1,000 in | 25,400 mm |
Conversion formula
millimeters = inches × 25.4
Example: 10 in × 25.4 = 254 mm
An inch is exactly 2.54 centimeters, fixed by the 1959 international yard and pound agreement. A millimeter is one thousandth of a meter, about the thickness of a credit card.
You may also see this conversion written as “inches to mm”, “inches in mm” or “inches to millimetres”.
Questions
How many millimeters are in one inch?
One inch is 25.4 millimeters.
How do you convert inches to millimeters?
Multiply by 25.4. The factor comes from the exact definitions of both units, so the only rounding is in the display.
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