Inches to Millimeters – inch to millimeter Converter
1 in = 25.4 mm
Formula
mm = in × 25.4
Inches to millimeters conversion table
| inches (in) | millimeters (mm) |
|---|---|
| 0.5 in | 12.7 mm |
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 20 in | 508 mm |
| 25 in | 635 mm |
| 50 in | 1270 mm |
| 75 in | 1905 mm |
| 100 in | 2540 mm |
| 250 in | 6350 mm |
| 500 in | 12700 mm |
| 1000 in | 25400 mm |
| 5000 in | 127000 mm |
Inches and millimeters are both length units. One inch equals 25.4 millimeters; enter any value above for an instant result, or use the table for common conversions.
Sanity-check examples
1 in = 25.4 mm10 in = 254 mm100 in = 2540 mm
Common pitfalls and look-alike units
The international statute mile is exactly 1.60934 km; the nautical mile is a different unit (1 nmi = 1.852 km) that shows up in knots. Chinese market units follow the modern definitions 1 li = 500 m, 1 chi = 1/3 m, 1 cun = 1/30 m — older chi varied by dynasty (roughly 0.32–0.35 m), so do not apply them to historical measurements.
Frequently asked questions
How many millimeters are in a inch?
1 inch (in) equals 25.4 millimeter (mm).
How do I convert inches to millimeters?
Multiply the inch value by 25.4 to get millimeter — for example, 2 inches = 50.8 millimeter.
How do I convert millimeters back to inches?
1 millimeter is approximately 0.0393701 inch. Use the swap button or the reverse conversion page linked on this page.