Converter
Method, assumptions and limitations
Conversion uses exact definitions (1 in = 25.4 mm, 1 lb = 0.45359237 kg, 1 lbf = 4.4482216152605 N; psi and ksi derived from these; °F = °C × 9/5 + 32; K = °C + 273.15). Results are rounded for display. Hardness scales are not included because conversions between hardness scales are material-dependent approximations.
Common conversions
| From | To | Factor |
|---|---|---|
| 1 in | mm | 25.4 (exact) |
| 1 lb | kg | 0.45359237 (exact) |
| 1 ksi | MPa | 6.894757 |
| 1 MPa | psi | 145.0377 |
| 1 µm Ra | µin Ra | 39.37 |
| 1 ft·lbf | J | 1.355818 |
| 1 lb/in³ | g/cm³ | 27.6799 |