Inches to Millimeters
Convert inches (in) to millimeters (mm). Live results, batch values, CSV export, formula and examples. Free, no sign-up.
Runs on your device · no data upload
Up to 500 values. Calculations stay on this device. Decimal point: dot. Results use floating-point arithmetic and the selected display precision.
Results
1 values converted
| row | input | from | result | to | error |
|---|---|---|---|---|---|
| 1 | 1 | in | 25.4 | mm | — |
International inch and foot definitions are used. A nautical mile is exactly 1,852 meters.
Raw response
[
{
"row": 1,
"input": 1,
"from": "in",
"result": "25.4",
"to": "mm"
}
]How to convert inches to millimeters
Enter one value or paste one value per line. Change precision, swap units, then copy or export the results. Invalid values are reported individually.
result = (value × 0.0254 + 0 − 0) ÷ 0.001
International inch and foot definitions are used. A nautical mile is exactly 1,852 meters.
| Inches (in) | Millimeters (mm) |
|---|---|
| 0 | 0 |
| 1 | 25.4 |
| 10 | 254 |
| 100 | 2540 |
Reference: NIST unit conversion factors. Decimal and binary storage prefixes are distinct; rounded display values do not change the underlying calculation.