Pound-force (lbf)
The pound-force (lbf) is the weight of one pound mass under standard gravity, exactly 4.4482216152605 N.
Symbol: lbf
Quantity: force
SI relation: 1 lbf = 4.448221615261 N (exact)
Derivation: 1 lbf = 0.45359237 kg × 9.80665 m/s² = 4.4482216152605 N
Exact: yes, by definition
Typical uses
- Thrust, tension and load ratings in US units
- Spring rates (lbf/in)
- Pressure in psi (lbf per square inch)
Convert pounds-force to other units
| Conversion | 1 lbf equals | Reverse |
|---|---|---|
| pound-force to newton | 4.448221615 N | newton to pound-force |
| pound-force to kilonewton | 0.004448221615 kN | kilonewton to pound-force |
| pound-force to kilogram-force | 0.45359237 kgf | kilogram-force to pound-force |
| pound-force to kip | 0.001 kip | kip to pound-force |
| pound-force to dyne | 444822.1615 dyn | dyne to pound-force |
| pound-force to gram-force | 453.59237 gf | gram-force to pound-force |
| pound-force to ounce-force | 16 ozf | ounce-force to pound-force |
Open the Force Converter to convert any value between all units.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "pound-force (lbf)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Pound-force (lbf). Retrieved October 17, 2026, from https://scientificconverters.com/units/pound-force/
IEEE
Scientific Converters, "Pound-force (lbf)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/pound-force/