Convert Kilojoules to Foot-pounds
1 kilojoule (kJ) equals 737.5621493 foot-pounds (ft·lbf).
1 kJ = 737.5621493 ft·lbf
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk kilojoule to foot-pound converter to paste a column from Excel.
How to Convert Kilojoule to Foot-pound
- 1 kJ = 737.5621493 ft·lbf
- 1 ft·lbf = 0.001355817948 kJ
- Example: convert 15 kJ to ft·lbf: 15 kJ = 15 × 737.5621493 ft·lbf = 11063.43224 ft·lbf
Formula
ft·lbf = kJ × 737.5621492773
Derivation from SI units:
- 1 kJ = 10³ J
- 1 ft·lbf = 0.3048 m × 4.4482216152605 N = 1.3558179483314 J
- 1 kJ = 1000 J ÷ 1.355817948331 J per ft·lbf = 737.5621492773 ft·lbf
Both units are defined exactly, so the factor is exact. Kilojoule definition: kilojoule; Foot-pound definition: foot-pound.
Worked examples
- A reading of 100 kJ converts to 73756.21493 ft·lbf.
100 kJ × 737.5621493 = 73756.21493 ft·lbf - A value of 1000 kJ is 737562.1493 ft·lbf.
1000 kJ × 737.5621493 = 737562.1493 ft·lbf
Kilojoule to Foot-pound conversion table
| Kilojoules (kJ) | Foot-pounds (ft·lbf) |
|---|---|
| 1 kJ | 737.5621493 ft·lbf |
| 4.184 kJ | 3085.960033 ft·lbf |
| 10 kJ | 7375.621493 ft·lbf |
| 50 kJ | 36878.10746 ft·lbf |
| 100 kJ | 73756.21493 ft·lbf |
| 250 kJ | 184390.5373 ft·lbf |
| 500 kJ | 368781.0746 ft·lbf |
| 840 kJ | 619552.2054 ft·lbf |
| 1000 kJ | 737562.1493 ft·lbf |
| 2000 kJ | 1475124.299 ft·lbf |
| 8700 kJ | 6416790.699 ft·lbf |
| 10000 kJ | 7375621.493 ft·lbf |
Where it's used
Kilojoules are used for nutrition labels (kJ per serving), while foot-pounds appear in muzzle energy of firearms and air rifles. Both measure energy, work and heat, so the conversion is a fixed factor.
Kilojoule to other energy units
| Conversion | 1 kJ equals |
|---|---|
| kilojoule to joule | 1000 J |
| kilojoule to megajoule | 0.001 MJ |
| kilojoule to calorie | 239.0057361 cal |
| kilojoule to kilocalorie | 0.2390057361 kcal |
| kilojoule to watt-hour | 0.2777777778 Wh |
| kilojoule to kilowatt-hour | 0.0002777777778 kWh |
| kilojoule to BTU | 0.9478171203 BTU |
| kilojoule to therm | 0.00000948043428 thm |
| kilojoule to electronvolt | 6.241509074 × 10²¹ eV |
| kilojoule to foot-pound | 737.5621493 ft·lbf |
| kilojoule to erg | 10000000000 erg |
Frequently asked questions
How many foot-pounds are in 1 kilojoule?
1 kJ = 737.5621493 ft·lbf.
How do I convert kilojoules to foot-pounds?
Multiply the value in kJ by 737.5621493. For example, 15 kJ × 737.5621493 = 11063.43224 ft·lbf.
Is the kJ to ft·lbf 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
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- 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, "foot pound-force (ft·lbf)".
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 Kilojoules to Foot-pounds. Retrieved October 17, 2026, from https://scientificconverters.com/energy/kilojoules-to-foot-pounds/
IEEE
Scientific Converters, "Convert Kilojoules to Foot-pounds," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/kilojoules-to-foot-pounds/