How many watt-hours are in one foot-pound?

1 foot-pound (ft·lbf) equals 0.000376616 watt-hours (Wh). This derives from 1 ft·lbf = 1.35582 J and 1 Wh = 3,600 J, so 1 ft·lbf ÷ 3,600 = 0.000376616 Wh.

How do I convert foot-pounds to watt-hours?

Multiply the ft·lbf value by 0.000376616. For example, 1,000 ft·lbf × 0.000376616 = 0.376616 Wh. This tool does the calculation automatically in real time.

What is a watt-hour (Wh)?

A watt-hour is the energy delivered by one watt of power over one hour. It equals 3,600 joules. Wh is used to rate batteries, household electricity consumption, and electrical appliances.

What is a foot-pound (ft·lbf)?

A foot-pound is an imperial unit of energy or work. It equals the energy transferred when a one-pound force moves an object one foot. It is used in the US for engine torque, firearm muzzle energy, and structural impact values.

How many foot-pounds equal one watt-hour?

1 watt-hour equals 2,655.22 foot-pounds (ft·lbf). To convert Wh to ft·lbf, multiply by 2,655.22.

Why convert foot-pounds to watt-hours?

Engineers bridging mechanical systems (torque, impact, ballistics) with electrical systems (batteries, motors, power supplies) need to compare energies across unit systems. Watt-hours are the standard for electrical energy; foot-pounds are common in US mechanical specs.

Foot Pounds to Watt Hours Converter

Name: Foot Pounds to Watt Hours Converter
Availability: InStock
Author: Nham Vu

Enter foot-pounds or watt-hours for instant bidirectional energy conversion with a reference table of common values.

Foot-Pounds ↔ Watt-Hours Converter

Foot-Pounds (ft·lbf)

ft·lbf

⇅

Watt-Hours (Wh)

Milliwatt-Hours (mWh)

mWh

1 ft·lbf = 0.000376616 Wh — 1 Wh = 2,655.22 ft·lbf

Quick Reference Table

Common ft·lbf values in watt-hours (1 ft·lbf = 0.000376616 Wh)

ft·lbf	Watt-Hours (Wh)	mWh

1 ft·lbf = 1.35581794833 J ÷ 3,600 = 0.000376616 Wh

Common real-world references

9mm pistol muzzle energy: ~370 ft·lbf (0.139 Wh)
.308 rifle muzzle energy: ~2,650 ft·lbf (0.998 Wh)
AA alkaline battery: ~4,500 Wh / 1.5V ≈ ~11,950,000 ft·lbf total energy
Lifting a 1 lb weight 1 foot: 1 ft·lbf = 0.376 mWh
One food calorie (kcal): ~3,085 ft·lbf (1.162 Wh)

Summary

Enter foot-pounds or watt-hours for instant bidirectional energy conversion with a reference table of common values.

How it works

Enter a foot-pound value in the ft·lbf field to see the watt-hour (and milliwatt-hour) equivalent instantly.
Enter a value in the Wh field to reverse-convert back to foot-pounds.
The mWh field also accepts input and converts in all directions.
All three fields update in real time — no button click needed.
Click any row in the reference table to load that value into the converter.

Use cases

Estimate battery energy storage needed to perform mechanical work measured in ft·lbf.
Convert motor output specifications from foot-pounds to watt-hours for electrical planning.
Compare firearm muzzle energy in ft·lbf with equivalent electrical energy in watt-hours.
Translate mechanical energy figures in US engineering documents to SI electrical units.
Verify energy balance calculations that mix imperial mechanical and SI electrical units.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu