Millimetres to inches converter
Inches (in)
1 millimetre = 0.03937007874 inches
How to convert millimetres to inches
in = mm × 0.0393700787402
Multiply the number of millimetres by 0.0393700787402 to get inches. Going the other way, divide by 0.0393700787402 (or multiply by 25.4).
One millimetre is exactly defined as 0.0393700787402 inches (to 12 significant figures), and one inch is 25.4 millimetres.
Worked examples
- Convert 5 millimetres: 5 × 0.0393700787402 = 0.1968503937 0.1968503937 inches.
- Convert 12.5 millimetres: 12.5 × 0.0393700787402 = 0.4921259843 0.4921259843 inches.
- Convert 250 millimetres: 250 × 0.0393700787402 = 9.842519685 9.842519685 inches.
Quick-reference table
| mm | in |
|---|---|
| 1 | 0.03937007874 |
| 2 | 0.07874015748 |
| 3 | 0.1181102362 |
| 5 | 0.1968503937 |
| 10 | 0.3937007874 |
| 15 | 0.5905511811 |
| 20 | 0.7874015748 |
| 25 | 0.9842519685 |
| 50 | 1.968503937 |
| 75 | 2.952755906 |
| 100 | 3.937007874 |
| 1,000 | 39.37007874 |
| in | mm |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 3 | 76.2 |
| 5 | 127 |
| 10 | 254 |
| 15 | 381 |
| 20 | 508 |
| 25 | 635 |
| 50 | 1,270 |
| 75 | 1,905 |
| 100 | 2,540 |
| 1,000 | 25,400 |
Related conversions
Frequently asked questions
How many inches are in 1 millimetre?
1 millimetre equals 0.03937007874 inches.
What is the formula to convert millimetres to inches?
Use in = mm × 0.0393700787402. Multiply the number of millimetres by 0.0393700787402 to get inches. Going the other way, divide by 0.0393700787402 (or multiply by 25.4).
What is 100 millimetres in inches?
100 millimetres is 3.937007874 inches.