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Convert between newtons, pounds-force, dynes, kgf, and more force units.
Force is a push or pull on an object measured in newtons (N). It equals mass times acceleration (F = ma) and is converted between SI, imperial, and CGS unit systems.
| Description | N | lbf | kgf |
|---|---|---|---|
| Apple weight | 1 | 0.22 | 0.10 |
| Human bite | 700 | 157 | 71 |
| Adult weight (70 kg) | 686 | 154 | 70 |
| Car engine thrust | 5,000 | 1,124 | 510 |
| Elevator cable (full) | 25,000 | 5,620 | 2,549 |
| Jet engine thrust | 300,000 | 67,443 | 30,592 |
Divide newtons by 4.44822 or multiply by 0.2248 to get lbf.
lbf = N × 0.224809
Divide newtons by 9.80665 to get kgf (weight of 1 kg on Earth).
kgf = N ÷ 9.80665
1 newton is the force needed to accelerate 1 kg at 1 m/s².
F = m × a (N = kg × m/s²)
Formula
F = m × a | 1 N = 1 kg·m/s² | 1 lbf = 4.44822 NF = Force in newtons (N)
m = Mass in kilograms (kg)
a = Acceleration in metres per second squared (m/s²)
lbf = Pound-force — the gravitational force on a 1 lb mass at standard gravity (9.80665 m/s²)
Worked Example
Convert 100 lbf to Newtons
Did you know? The newton is named after Isaac Newton and became the SI unit of force in 1948. One newton is approximately the force needed to hold a medium apple (102 g) against gravity — making it a surprisingly relatable everyday unit.
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