Inch to Millimeter (in → mm)
Convert inch to millimeter instantly. The conversion factor below is exact by international definition.
Realtime·length·imperial
Exact
in
× 25.4
mm
25.4
Precision [auto]
6
📐in to mm formulaExact
mm = in × 25.4
Inverse: in = mm × 0.03937007874
Worked example: 1 in = 25.4 mm
ℹ️About these units
Inch (in)
Source: NIST: 1 in = 0.0254 m exact.
Millimeter (mm)
📊Reference table: in → mm
| Inch (in) | Millimeter (mm) |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 5 | 127 |
| 10 | 254 |
| 15 | 381 |
| 20 | 508 |
| 25 | 635 |
| 50 | 1,270 |
| 100 | 2,540 |
| 250 | 6,350 |
| 500 | 12,700 |
| 750 | 19,050 |
| 1,000 | 25,400 |
Want a downloadable CSV? Append ?format=csv to the API /api/v1/table endpoint.
🔁Reverse & related
🔌API & widget
GET https://convertnavi.com/api/v1/convert?value=10&from=inch&to=millimeterEmbed this converter
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