Foot-pounds to Watt-hours Converter
One Foot-pound equals 0.0003766160968 Watt-hours (1 ft-lb = 0.0003766160968 Wh). Multiply a Foot-pound value by 0.0003766160967 to get the equivalent in Watt-hours. Enter your value in the calculator above. The formula and examples below show how to calculate it by hand.
Formula
Wh = ft-lb × 0.0003766160967
Multiply the Foot-pound value by 0.0003766160967 to get the equivalent value in Watt-hours.
Example Conversions
1 Foot-pound (ft-lb)
0.0003766160968 Watt-hour (Wh)
5 Foot-pound (ft-lb)
0.001883080484 Watt-hour (Wh)
10 Foot-pound (ft-lb)
0.003766160967 Watt-hour (Wh)
25 Foot-pound (ft-lb)
0.009415402419 Watt-hour (Wh)
100 Foot-pound (ft-lb)
0.03766160967 Watt-hour (Wh)
Conversion Table
| Foot-pound (ft-lb) | Watt-hour (Wh) |
|---|---|
| 0.1 | 0.00003766160967 |
| 0.5 | 0.0001883080484 |
| 1 | 0.0003766160968 |
| 2 | 0.0007532321935 |
| 5 | 0.001883080484 |
| 10 | 0.003766160967 |
| 25 | 0.009415402419 |
| 50 | 0.01883080484 |
| 100 | 0.03766160967 |
| 250 | 0.09415402419 |
| 500 | 0.1883080484 |
| 1000 | 0.3766160968 |
How to Convert Manually
Use these steps to convert Foot-pound values to Watt-hour without the calculator.
- Write down the value in Foot-pound (ft-lb) that you want to convert.
- Multiply that value by 0.0003766160967.
- For example, 10 Foot-pounds × 0.0003766160967 = 0.003766160967 Watt-hours.
- Label the result as Watt-hour (Wh).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Foot-pound and one Watt-hour.
About Foot-pound and Watt-hour
The foot-pound is about 1.3558 joules, the work of one pound-force through one foot. US mechanical engineering and firearm muzzle energy use foot-pounds. The watt-hour is exactly 3,600 joules: one watt sustained for one hour. Battery capacities for phones, laptops, and e-bikes are rated in watt-hours. One Foot-pound equals 0.0003766160968 Watt-hours (1 ft-lb = 0.0003766160968 Wh). Foot-pound is used in US mechanical engineering and in firearm muzzle energy. Watt-hour is used in battery capacity ratings.
Precision and Rounding:Energy factors mix exact definitions (1 kWh = 3,600,000 J; 1 cal = 4.184 J thermochemical) with measured conventions (1 BTU ≈ 1,055.056 J). Nutrition and utility bills round to whole units; engineering heat calculations should keep the full factor until the final step.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15Foot-pounds equals0.005649241451Watt-hours.
15 ft-lb × 0.0003766160967 = 0.005649241451 Wh
FAQ
How do I convert Foot-pound to Watt-hour?
Multiply the Foot-pound value by 0.0003766160967 to get the equivalent value in Watt-hours.
What is the formula for Foot-pound to Watt-hour?
The formula is Wh = ft-lb × 0.0003766160967.
How many Watt-hours are in 1 Foot-pound?
1 Foot-pound equals 0.0003766160968 Watt-hours.
Can I convert Watt-hour back to Foot-pound?
Yes. 1 Watt-hour equals 2655.223737 Foot-pounds, and the related converter can reverse the calculation.
What are common names for Foot-pound and Watt-hour?
Foot-pound is shown as ft-lb and may also be searched as foot-pound, foot pound, ft·lb. Watt-hour is shown as Wh and may also be searched as watt hour, watt-hour.
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