Engineering Design Tables
Published source-linked values only; unverified material and section datasets are not displayed.
VERIFIED TABLE
Exact engineering length conversions
Exact SI and inch/foot conversion factors used by the Length Unit Converter.
| Quantity | Exact relationship | Decimal conversion |
|---|---|---|
| metre to millimetre | 1 m = 1000 mm | 1000 mm |
| inch to millimetre | 1 in = 25.4 mm | 25.4 mm |
| foot to millimetre | 1 ft = 12 in | 304.8 mm |
Source: NIST Special Publication 811, Guide for the Use of the International System of Units (SI).
Open source metadata →