Convert millimeters to inches
1 mm = 0.0393700787402 in — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
0.039 370 078 740 2in
As a fraction: 5/127
1 mm = 0.0393700787402 in
How to convert millimeters to inches
Multiply the number of millimeters by 0.0393700787402 to get inches.
Inch: Defined as exactly 25.4 mm by the 1959 international yard and pound agreement.
Millimeter to Inch conversion table
| Millimeters (mm) | Inches (in) |
|---|---|
| 1 mm | 0.039 370 079 |
| 2 mm | 0.078 740 157 |
| 3 mm | 0.118 110 24 |
| 5 mm | 0.196 850 39 |
| 10 mm | 0.393 700 79 |
| 20 mm | 0.787 401 57 |
| 25 mm | 0.984 251 97 |
| 50 mm | 1.968 503 9 |
| 100 mm | 3.937 007 9 |
| 250 mm | 9.842 519 7 |
| 500 mm | 19.685 039 |
| 1000 mm | 39.370 079 |
Inch to Millimeter conversion table
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 in | 25.4 |
| 2 in | 50.8 |
| 3 in | 76.2 |
| 5 in | 127 |
| 10 in | 254 |
| 20 in | 508 |
| 25 in | 635 |
| 50 in | 1270 |
| 100 in | 2540 |
| 250 in | 6350 |
| 500 in | 12 700 |
| 1000 in | 25 400 |
Frequently asked
How many inches are in a millimeter?
One millimeter equals 0.03937007874 inches (mm → in). That figure is exact, not rounded.
How do you convert millimeters to inches?
Multiply the number of millimeters by 0.0393700787402 to get inches.
What is 1 in in millimeters?
One inch is 25.4 millimeters.
What is 10 mm in in?
10 mm = 0.393 700 79 in.
What exactly is a inch?
Defined as exactly 25.4 mm by the 1959 international yard and pound agreement.