Unit converter
Enter a value and pick its unit to see all the other units of the same kind. Handy for reading metric and inch catalogs side by side (SFM, IPR, psi, lbf) and the kgf-based units still used on Japanese machines and drawings.
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About the conversion factors
- 1 kgf (kilogram-force) = 9.80665 N, fixed by standard gravity.
- 1 in = 25.4 mm, 1 ft = 0.3048 m and 1 lb = 0.45359237 kg are exact by international agreement.
- 1 psi = 1 lbf/in² ≈ 6894.76 Pa; 1 MPa = 1 N/mm².
- Cutting speed: 1 SFM (surface feet per minute) = 0.3048 m/min. Feed: 1 IPR (inch per revolution) = 25.4 mm/rev.
Source: NIST Special Publication 811 (Guide for the Use of the International System of Units), Appendix B