Convert between newtons, pound-force, kilogram-force, and more force units.
Force is a physical quantity that describes the push or pull on an object. It's defined by Newton's second law: F = ma (force equals mass times acceleration).
The SI unit of force is the Newton (N), defined as the force required to accelerate 1 kilogram of mass at 1 meter per second squared.
Other common force units include:
All conversions use Newton (N) as the intermediate SI standard.
Convert 100 lbf to N (step-by-step)
Step 1: Identify conversion factor
Step 2: Multiply input by factor
| Newtons (N) | Pound-force (lbf) | Kilogram-force (kgf) |
|---|---|---|
| 1 | 0.224809 | 0.101972 |
| 10 | 2.24809 | 1.01972 |
| 100 | 22.4809 | 10.1972 |
| 444.822 | 100 | 45.3592 |
| 1000 | 224.809 | 101.972 |
| 4448.22 | 1000 | 453.592 |
Weight is a specific type of force — it's the force of gravity acting on a mass. On Earth, 1 kilogram of mass experiences a gravitational force (weight) of 9.80665 N or 1 kgf. Weight changes with location, but mass stays constant.
Different engineering disciplines and countries developed their own systems. The Newton is the SI standard, but pound-force is common in the US, while kgf is used in some older engineering references.
The dyne is part of the CGS (centimeter-gram-second) system, used in some physics and older scientific literature. 1 dyne is a very small force — it takes 100,000 dynes to equal 1 Newton.
The conversion factors used are internationally standardized to high precision. Results are displayed with up to 6 decimal places, which is more than sufficient for most engineering applications.
"lb" is a unit of mass (pound-mass), while "lbf" is a unit of force (pound-force). In Earth's gravity, a 1 lb mass experiences 1 lbf of gravitational force, but they're fundamentally different quantities.
Kips (1 kip = 1,000 lbf) are commonly used in structural engineering for buildings and bridges where forces are very large. It's easier to say 'the beam can handle 50 kips' than '50,000 pound-force.'
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