force · International · Modern
SI derived unit of force; 1 N = 1 kg·m·s⁻².
Converter
force · US and international engineering · Modern
pound-force
exact
- Record
- M315
- Definition quality
- Exact by definition
- Conversion mode
- multiplicative
- Calculator
- Fully calculable
Definition
1 lbf = 4.4482216152605 N
Reference value
One pound-force is exactly 4.4482216153 newtons.
History & use
Pound-force remains part of engineering practice built around foot–pound–second and U.S. customary units.
Modern use
Modern use is context-dependent and varies by region or measurement system.
Sources & evidence
Source tier — · confidence high
- Ambler Thompson and Barry N. Taylor, National Institute of Standards and Technology — https://www.nist.gov/pml/special-publication-811
- National Bureau of Standards / Commonwealth national standards laboratories — https://www.nist.gov/pml/us-surveyfoot
- Conférence Générale des Poids et Mesures / BIPM — https://www.bipm.org/en/committees/cg/cgpm
Related measurements
force · Scientific legacy · Modern/historical
1 dyn = 10⁻⁵ N
force · International legacy/specialist · Modern/historical
1 kgf = 9.80665 N