Foot Pounds to Watt Hours
Convert foot pounds to watt hours instantly — one foot-pound is 0.000376616 watt hours.
| Foot Pounds | Watt Hours |
|---|---|
| 1 ft·lb | 0.000377 Wh |
| 2 ft·lb | 0.000753 Wh |
| 3 ft·lb | 0.00113 Wh |
| 5 ft·lb | 0.001883 Wh |
| 10 ft·lb | 0.003766 Wh |
| 25 ft·lb | 0.009415 Wh |
| 50 ft·lb | 0.018831 Wh |
| 100 ft·lb | 0.037662 Wh |
How to use
- Enter a value in the Foot Pounds field.
- The Watt Hours figure appears immediately — no button to press.
- Typing in the Watt Hours field converts back to Foot Pounds the same way.
- Use the reference table for the values that come up most often.
Foot Pounds to Watt Hours formula
Converting foot pounds to watt hours is a single multiplication by 0.000376616097.
Wh = ft·lb × 0.000376616097
Why this factor: the foot-pound and the watt-hour are both defined against the joule, so dividing one definition by the other gives 0.000376616097 directly. Both definitions are set out in full below.
To go the other way, divide by 0.000376616097 — or use the Watt Hours to Foot Pounds converter, which is the same calculation reversed.
Worked example
Start with 500 ft·lb. Multiply by 0.000376616097 to get 0.188308 Wh.
500 ft·lb × 0.000376616097 = 0.188308 Wh
The converter above does this for any value you type, in either direction.
What is a foot-pound?
A foot-pound is the work done by one pound-force acting through one foot.
Definition: About 1.3558179 joules.
Where it is used: US mechanical work and torque figures, fastener specifications, and firearm muzzle energy.
Worth knowing: As a torque unit it is properly 'pound-foot' (lbf·ft); as an energy unit it is 'foot-pound'. The numbers coincide but the quantities differ.
What is a watt-hour?
A watt-hour is the energy delivered by one watt of power sustained for one hour.
Definition: Exactly 3,600 joules.
Where it is used: Battery capacity for laptops, e-bikes and power tools, and small-scale energy metering.
Worth knowing: Airline lithium-battery limits are set in watt-hours, which is why laptop and power-bank capacities are labelled in Wh.
Foot Pounds vs Watt Hours
The foot-pound is a US customary unit while the watt-hour is a specialized unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many watt hours are in a foot-pound?
One foot-pound equals 0.000376616097 watt hours.
What is the formula to convert foot pounds to watt hours?
Multiply the number of foot pounds by 0.000376616097. To reverse it, divide by 0.000376616097 instead.
How do I convert watt hours back to foot pounds?
Divide by 0.000376616097, which is the same as multiplying by 2655.22374.
How many watt hours are in 10 foot pounds?
10 ft·lb works out to 0.003766 Wh.
Is there anything to watch out for with foot pounds?
As a torque unit it is properly 'pound-foot' (lbf·ft); as an energy unit it is 'foot-pound'. The numbers coincide but the quantities differ.
How is the foot-pound defined?
About 1.3558179 joules.