Convert Pounds-force to Kilonewtons
1 pound-force (lbf) equals 0.004448221615 kilonewtons (kN).
1 lbf = 0.004448221615 kN
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk pound-force to kilonewton converter to paste a column from Excel.
How to Convert Pound-force to Kilonewton
- 1 lbf = 0.004448221615 kN
- 1 kN = 224.8089431 lbf
- Example: convert 15 lbf to kN: 15 lbf = 15 × 0.004448221615 kN = 0.06672332423 kN
Formula
kN = lbf × 0.004448221615261
or kN = lbf ÷ 224.8089430997
Derivation from SI units:
- 1 lbf = 0.45359237 kg × 9.80665 m/s² = 4.4482216152605 N
- 1 kN = 10³ N
- 1 lbf = 4.448221615261 N ÷ 1000 N per kN = 0.004448221615261 kN
Both units are defined exactly, so the factor is exact. Pound-force definition: pound-force; Kilonewton definition: kilonewton.
Worked examples
- A 5000 lbf winch is rated 22.24110808 kN.
5000 lbf × 0.004448221615 = 22.24110808 kN - 10000 lbf is 44.48221615 kN.
10000 lbf × 0.004448221615 = 44.48221615 kN
Pound-force to Kilonewton conversion table
| Pounds-force (lbf) | Kilonewtons (kN) |
|---|---|
| 1 lbf | 0.004448221615 kN |
| 5 lbf | 0.02224110808 kN |
| 10 lbf | 0.04448221615 kN |
| 25 lbf | 0.1112055404 kN |
| 50 lbf | 0.2224110808 kN |
| 100 lbf | 0.4448221615 kN |
| 200 lbf | 0.8896443231 kN |
| 500 lbf | 2.224110808 kN |
| 1000 lbf | 4.448221615 kN |
| 5000 lbf | 22.24110808 kN |
| 10000 lbf | 44.48221615 kN |
Where it's used
Large US forces in lbf are converted to kilonewtons for metric structural and lifting calculations.
Pound-force to other force units
| Conversion | 1 lbf equals |
|---|---|
| pound-force to newton | 4.448221615 N |
| pound-force to kilonewton | 0.004448221615 kN |
| pound-force to kilogram-force | 0.45359237 kgf |
| pound-force to kip | 0.001 kip |
| pound-force to dyne | 444822.1615 dyn |
| pound-force to ounce-force | 16 ozf |
| pound-force to gram-force | 453.59237 gf |
Frequently asked questions
How many kN is 1000 lbf?
1000 lbf = 4.448221615 kN.
How many kilonewtons are in 1 pound-force?
1 lbf = 0.004448221615 kN.
How do I convert pounds-force to kilonewtons?
Multiply the value in lbf by 0.004448221615, or divide it by 224.8089431. For example, 15 lbf × 0.004448221615 = 0.06672332423 kN.
Is the lbf to kN conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "pound-force (lbf)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Pounds-force to Kilonewtons. Retrieved October 17, 2026, from https://scientificconverters.com/force/pound-force-to-kilonewtons/
IEEE
Scientific Converters, "Convert Pounds-force to Kilonewtons," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/force/pound-force-to-kilonewtons/