Convert Watt-hours to Foot-pounds
1 watt-hour is 2,655.223737 ft·lbf. One watt-hour is exactly 2655.2237374 foot-pounds.
One watt-hour is 2655.2237 foot-pounds. To convert watt-hours to foot-pounds, multiply by 2655.2237; to go the other way, divide by 2655.2237 or multiply by 3.7662 × 10^-4. The factor is exact rather than rounded: it follows from NIST Special Publication 811. One watt sustained for an hour, so exactly 3,600 joules.
Factor checked against the defining standard · How we check
- Watt-hours × 2655.2237
value * 2655.22373742,655.224 ft·lbf
1 watt-hour in every energy unit
| Unit | Value | Exact factor |
|---|---|---|
| joules | 3,600 J | × 3,600 |
| kilojoules | 3.6 kJ | × 3.6 |
| calories | 860.4206501 cal | × 860.420650096 |
| kilocalories | 0.8604206501 kcal | × 0.860420650096 |
| watt-hours (as entered) | 1 Wh | — |
| kilowatt-hours | 0.001 kWh | × 0.001 |
| British thermal units | 3.412141633 BTU | × 3.41214163313 |
| foot-pounds | 2,655.223737 ft·lbf | × 2,655.2237374 |
Factors are entered by hand from NIST Special Publication 811 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert watt-hours to foot-pounds?
- 1.Take the measurement in watt-hours.
- 2.Multiply by 2655.2237 — that is how many foot-pounds fit in one watt-hour.
- 3.To go back the other way, divide by 2655.2237, or multiply by 3.7662 × 10^-4.
Worked example: 25 watt-hours to foot-pounds
- Formula
- Wh × 2655.2237 = ft·lbf
- Arithmetic
- 25 × 2655.2237 = 66,380.593435 ft·lbf
- Answer
- 25 Wh = 66,380.593435 ft·lbf
The factor is rounded for display; the figure above is computed from the full value.
Watt-hours to foot-pounds conversion table
| Watt-hours | Foot-pounds |
|---|---|
| 1 Wh | 2,655.223737 ft·lbf |
| 2 Wh | 5,310.447475 ft·lbf |
| 3 Wh | 7,965.671212 ft·lbf |
| 4 Wh | 10,620.89495 ft·lbf |
| 5 Wh | 13,276.118687 ft·lbf |
| 6 Wh | 15,931.342424 ft·lbf |
| 7 Wh | 18,586.566162 ft·lbf |
| 8 Wh | 21,241.789899 ft·lbf |
| 9 Wh | 23,897.013637 ft·lbf |
| 10 Wh | 26,552.237374 ft·lbf |
| 12 Wh | 31,862.684849 ft·lbf |
| 15 Wh | 39,828.356061 ft·lbf |
| 20 Wh | 53,104.474748 ft·lbf |
| 25 Wh | 66,380.593435 ft·lbf |
| 50 Wh | 132,761.18687 ft·lbf |
| 100 Wh | 265,522.37374 ft·lbf |
| 200 Wh | 531,044.74748 ft·lbf |
| 300 Wh | 796,567.12122 ft·lbf |
| 500 Wh | 1,327,611.8687 ft·lbf |
| 1000 Wh | 2,655,223.7374 ft·lbf |
| 2000 Wh | 5,310,447.4748 ft·lbf |
| 5000 Wh | 13,276,118.687 ft·lbf |
| 10000 Wh | 26,552,237.374 ft·lbf |
What is a watt-hour?
One watt sustained for an hour, so exactly 3,600 joules. Battery capacity is quoted here because it is an amount of energy rather than a rate.
What is a foot-pound?
A pound-force acting through one foot. The same arithmetic as the torque unit of that name, and a different quantity: this one is work done, not twist applied.
How many foot-pounds are in a watt-hour?
One watt-hour is 2655.2237 foot-pounds. Going the other way, one foot-pound is 3.7662 × 10^-4 watt-hours. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every energy unit here
| Unit | Symbol | One of these is |
|---|---|---|
| Joules | J | the base unit |
| Kilojoules | kJ | 1000 joule |
| Calories | cal | 4.184 joule |
| Kilocalories | kcal | 4184 joule |
| Watt-hours | Wh | 3600 joule |
| Kilowatt-hours | kWh | 3600000 joule |
| British thermal units | BTU | 1055.0559 joule |
| Foot-pounds | ft·lbf | 1.3558179 joule |
Source: NIST Special Publication 811 — the thermochemical calorie is exactly 4.184 J
Questions people actually ask
- How many foot-pounds are in a watt-hour?
- 2655.2237. A pound-force acting through one foot. The same arithmetic as the torque unit of that name, and a different quantity: this one is work done, not twist applied.
- How do I convert foot-pounds back to watt-hours?
- Divide by 2655.2237, or multiply by 3.7662 × 10^-4 — they are the same operation.
Other energy conversions
Foot-pounds to watt-hours — the same conversion the other way.