Newton to Pound-force Converter
Converts newton (N) to pound-force (lbf) and back. The conversion factor is shown below every result.
How to Convert Newton to Pound-force
What Is a Newton?
The newton (N) is the SI unit of force, defined as the force needed to accelerate 1 kilogram at 1 meter per second squared.
What Is a Pound-force?
The pound-force (lbf) is a US customary unit of force, defined as exactly 4.4482216152605 newtons (a pound-mass under standard gravity, 9.80665 m/s²).
Common Newton to Pound-force Reference Points
Real-world reference values for quick sanity checks.
| Item | Newton (N) | Pound-force (approx.) |
|---|---|---|
| Force to hold up a medium apple (approx.) | 1 N | 0.225 lbf |
| A typical adult's body weight force (approx.) | 700 N | 157.37 lbf |
| Reference values are illustrative approximations for common items, not measured specifications. | ||
Newton to Pound-force Conversion Table
| Newton (N) | Pound-force (lbf) |
|---|---|
| 1 N | 0.224809 lbf |
| 5 N | 1.124045 lbf |
| 10 N | 2.248089 lbf |
| 50 N | 11.240447 lbf |
| 100 N | 22.480894 lbf |
| 500 N | 112.404472 lbf |
| 700 N | 157.36626 lbf |
| 1000 N | 224.808943 lbf |
| Source: NIST SP 811, Appendix B (1 lbf = 4.4482216152605 N exactly) | |
Frequently Asked Questions
How do I convert newtons to pounds-force?
Multiply the newton value by 0.2248089431. For example, 100 N × 0.2248089431 = 22.481 lbf.
Is this the same "pounds" used for body weight on a bathroom scale?
Related but not identical. A bathroom scale reads pound-mass (the everyday pound used on the Weight & Mass converter). Pound-force is the force that mass exerts under standard gravity. On Earth's surface the numbers are close enough that people often use them interchangeably, but they're technically different quantities (mass vs. force).
Why is the factor 0.2248089431 and not something rounder?
It's the reciprocal of the exact newtons-per-pound-force definition (4.4482216152605 N), which itself comes from multiplying the exact pound-mass (0.45359237 kg) by exact standard gravity (9.80665 m/s²).
Related Force Converters
A good measuring tool marked in both N and lbf removes the guesswork at the point of use.