Convert Foot-pounds to Watt-hours
1 foot-pound (ft·lbf) equals 0.0003766160968 watt-hours (Wh).
1 ft·lbf = 0.0003766160968 Wh
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk foot-pound to watt-hour converter to paste a column from Excel.
How to Convert Foot-pound to Watt-hour
- 1 ft·lbf = 0.0003766160968 Wh
- 1 Wh = 2655.223737 ft·lbf
- Example: convert 15 ft·lbf to Wh: 15 ft·lbf = 15 × 0.0003766160968 Wh = 0.005649241451 Wh
Formula
Wh = ft·lbf × 0.0003766160967587
or Wh = ft·lbf ÷ 2655.223737398
Derivation from SI units:
- 1 ft·lbf = 0.3048 m × 4.4482216152605 N = 1.3558179483314 J
- 1 Wh = 1 W × 3600 s = 3600 J
- 1 ft·lbf = 1.355817948331 J ÷ 3600 J per Wh = 0.0003766160967587 Wh
Both units are defined exactly, so the factor is exact. Foot-pound definition: foot-pound; Watt-hour definition: watt-hour.
Worked examples
- A reading of 25 ft·lbf converts to 0.009415402419 Wh.
25 ft·lbf × 0.0003766160968 = 0.009415402419 Wh - A value of 250 ft·lbf is 0.09415402419 Wh.
250 ft·lbf × 0.0003766160968 = 0.09415402419 Wh
Foot-pound to Watt-hour conversion table
| Foot-pounds (ft·lbf) | Watt-hours (Wh) |
|---|---|
| 1 ft·lbf | 0.0003766160968 Wh |
| 5 ft·lbf | 0.001883080484 Wh |
| 10 ft·lbf | 0.003766160968 Wh |
| 25 ft·lbf | 0.009415402419 Wh |
| 50 ft·lbf | 0.01883080484 Wh |
| 100 ft·lbf | 0.03766160968 Wh |
| 250 ft·lbf | 0.09415402419 Wh |
| 500 ft·lbf | 0.1883080484 Wh |
| 1000 ft·lbf | 0.3766160968 Wh |
| 2000 ft·lbf | 0.7532321935 Wh |
Where it's used
Foot-pounds are used for muzzle energy of firearms and air rifles, while watt-hours appear in battery capacity (phone ≈ 15 Wh; airline limit 100 Wh per power bank). Both measure energy, work and heat, so the conversion is a fixed factor.
Foot-pound to other energy units
| Conversion | 1 ft·lbf equals |
|---|---|
| foot-pound to joule | 1.355817948 J |
| foot-pound to kilojoule | 0.001355817948 kJ |
| foot-pound to megajoule | 0.000001355817948 MJ |
| foot-pound to calorie | 0.3240482668 cal |
| foot-pound to kilocalorie | 0.0003240482668 kcal |
| foot-pound to watt-hour | 0.0003766160968 Wh |
| foot-pound to kilowatt-hour | 3.766160968 × 10⁻⁷ kWh |
| foot-pound to BTU | 0.001285067463 BTU |
| foot-pound to therm | 1.285374295 × 10⁻⁸ thm |
| foot-pound to electronvolt | 8.462350028 × 10¹⁸ eV |
| foot-pound to erg | 13558179.48 erg |
Frequently asked questions
How many watt-hours are in 1 foot-pound?
1 ft·lbf = 0.0003766160968 Wh.
How do I convert foot-pounds to watt-hours?
Multiply the value in ft·lbf by 0.0003766160968, or divide it by 2655.223737. For example, 15 ft·lbf × 0.0003766160968 = 0.005649241451 Wh.
Is the ft·lbf to Wh 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, "foot pound-force (ft·lbf)".
- 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, "watt hour (W·h)".
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 Foot-pounds to Watt-hours. Retrieved October 17, 2026, from https://scientificconverters.com/energy/foot-pounds-to-watt-hours/
IEEE
Scientific Converters, "Convert Foot-pounds to Watt-hours," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/energy/foot-pounds-to-watt-hours/