Pound-force to Newtons Converter
1 lbf = 4.44822 N. A 100 lbf load equals 444.8 N. Gravity on Earth: 1 lb mass weighs 1 lbf = 4.448 N.
Inverse conversion
1 N = 0.224809 lbf. Gravity on Earth exerts 9.80665 N per kg, so a 1 kg mass weighs 2.205 lbf.
Note
lbf (pound-force) is a force unit. Do not confuse with lb (pound-mass).
Formula
Formula
N = lbf × 4.44822
Worked example
To convert 100 lbf to newtons: 100 × 4.44822 = 444.82 N.
Quick reference table
| lbf | N |
|---|---|
| 1 | 4.448222 |
| 5 | 22.241108 |
| 10 | 44.482216 |
| 25 | 111.20554 |
| 50 | 222.411081 |
| 100 | 444.822162 |
| 250 | 1112.055404 |
| 500 | 2224.110808 |
| 1000 | 4448.221615 |
Unit definitions
Pound-force (lbf)
The pound-force (lbf) is the gravitational force exerted on a mass of 1 pound at standard gravity. It is distinct from the pound-mass (lb).
Newton (N)
The newton (N) is the SI unit of force. Named after Isaac Newton, 1 N = 1 kg·m/s².
Common use cases
- Converting US engineering specs to SI
- Fastener tension specifications
- Spring force ratings
- Load cell calibration