Convert Pounds-force to Newtons
1 pound-force (lbf) equals 4.448221615 newtons (N).
1 lbf = 4.448221615 N
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk pound-force to newton converter to paste a column from Excel.
How to Convert Pound-force to Newton
- 1 lbf = 4.448221615 N
- 1 N = 0.2248089431 lbf
- Example: convert 15 lbf to N: 15 lbf = 15 × 4.448221615 N = 66.72332423 N
Formula
N = lbf × 4.448221615261
Derivation from SI units:
- 1 lbf = 0.45359237 kg × 9.80665 m/s² = 4.4482216152605 N
- 1 N = 1 kg·m/s²
Both units are defined exactly, so the factor is exact. Pound-force definition: pound-force; Newton definition: newton.
Worked examples
- A 50 lbf pull is 222.4110808 N.
50 lbf × 4.448221615 = 222.4110808 N - A 1000 lbf thrust is 4448.221615 N.
1000 lbf × 4.448221615 = 4448.221615 N
Pound-force to Newton conversion table
| Pounds-force (lbf) | Newtons (N) |
|---|---|
| 1 lbf | 4.448221615 N |
| 5 lbf | 22.24110808 N |
| 10 lbf | 44.48221615 N |
| 25 lbf | 111.2055404 N |
| 50 lbf | 222.4110808 N |
| 100 lbf | 444.8221615 N |
| 200 lbf | 889.6443231 N |
| 500 lbf | 2224.110808 N |
| 1000 lbf | 4448.221615 N |
| 5000 lbf | 22241.10808 N |
| 10000 lbf | 44482.21615 N |
Where it's used
US force ratings in lbf are converted to newtons for SI calculations. Multiply by exactly 4.4482216152605.
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
Is a pound-force the same as a pound?
A pound (lb) is mass; a pound-force (lbf) is the weight of that mass under standard gravity, 4.448 N.
How many newtons are in 1 pound-force?
1 lbf = 4.448221615 N.
How do I convert pounds-force to newtons?
Multiply the value in lbf by 4.448221615. For example, 15 lbf × 4.448221615 = 66.72332423 N.
Is the lbf to N 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 4, coherent derived units with special names.
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 Newtons. Retrieved October 17, 2026, from https://scientificconverters.com/force/pound-force-to-newtons/
IEEE
Scientific Converters, "Convert Pounds-force to Newtons," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/force/pound-force-to-newtons/