How to convert foot-pounds to watt-hours
To convert a measurement in foot-pounds to watt-hours, multiply the value by 0.000376616097. The conversion factor comes from the relationship between both units and the joule.
For example, to convert 5 ft·lb to watt-hours: 5 × 0.000376616097 = 0.001883080484 Wh.
What is a foot-pound?
A foot-pound is an imperial unit of energy equal to the work done when a force of one pound-force acts through a distance of one foot, about 1.356 joules. The foot-pound comes from imperial mechanics and is still used in the US for torque and energy, notably to describe the muzzle energy of firearms and the output of engines.
Common uses of foot-pounds include: Firearm muzzle energy; Torque specifications (as ft·lbf); Mechanical work in imperial units; Engine and tool energy ratings.
What is a watt-hour?
A watt-hour is the energy delivered by one watt of power over one hour, equal to 3,600 joules. The watt-hour emerged with the electrical industry as a practical measure of energy use over time. It underpins the kilowatt-hour that appears on electricity bills worldwide.
Common uses of watt-hours include: Battery capacity ratings; Small electronics energy use; Solar panel and storage sizing; Portable power station specifications.
Foot-pounds to watt-hours worked examples
Here are some common values converted:
1 ft·lb = 0.000376616097 Wh 5 ft·lb = 0.001883080484 Wh 10 ft·lb = 0.003766160968 Wh 50 ft·lb = 0.018830804838 Wh 100 ft·lb = 0.037661609676 Wh
Frequently asked questions
How many watt-hours are in one foot-pound?
One foot-pound (ft·lb) equals 0.000376616097 watt-hours (Wh). Multiply any value in foot-pounds by 0.000376616097 to convert to watt-hours.
How do I convert foot-pounds to watt-hours?
Multiply the value in foot-pounds by 0.000376616097. For example, 5 ft·lb × 0.000376616097 = 0.001883080484 Wh.
How do I convert watt-hours to foot-pounds?
Multiply the value in watt-hours by 2,655.2237, or divide by 0.000376616097. Use the swap button on the converter above to reverse the direction.
Is the foot-pound to watt-hour conversion exact?
The thermochemical calorie is defined as exactly 4.184 J and the BTU as 1055.056 J. Conversions between SI energy units are exact.
What is the formula for foot-pounds to watt-hours?
The formula is: Wh = ft·lb × 0.000376616097. This comes from the definition of both units relative to the joule.