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Energy
Foot-pounds to Watt-hours
Convert foot-pounds (ft·lb) to watt-hours (Wh). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 ft·lb = 0.000377 Wh
Foot-pounds to Watt-hours Conversion Table
Common values, ready to copy:
| foot-pounds | watt-hours |
|---|---|
| 1 ft·lb | 0.000377 Wh |
| 2 ft·lb | 0.000753 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 |
| 1,000 ft·lb | 0.376617 Wh |
Formula
watt-hours = foot-pounds × 3.76616667e-4
Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.
About Foot-pounds and Watt-hours
Foot-pounds (ft·lb): The work done lifting one pound through one foot against gravity; 1 ft·lb = 1.35582 J. Common uses: Torque specifications in US automotive contexts (lug nuts, bolt torque), and some US engineering work.
Watt-hours (Wh): The energy consumed by a 1-watt device in 1 hour; equals 3,600 joules. Common uses: Small battery capacities (laptop batteries are typically 40-100 Wh), and lighting energy use.
How the conversion works
Energy uses the SI joule. Food calories (kcal) are 1,000 small calories: 1 kcal = 4,184 J. 1 kWh = 3.6 MJ = 3,600,000 J. 1 BTU = 1,055.06 J.
The exact relationship is watt-hours = foot-pounds × 3.76616667e-4, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between foot-pounds and watt-hours comes up wherever energy measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.