Work from one pound-force over one foot.
Foot-pounds to Watt-hours Converter — ft-lb to Wh
Convert Foot-pound (ft-lb) to Watt-hour (Wh) using the exact conversion factor (1 foot-pound = 0.0003766161 watt-hour). See the formula, worked examples, conversion table, and common uses.
Foot-pounds to Watt-hours converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
A watt-hour is 3,600 joules.
Result = input x 1.355817948 / 3600.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Foot-pounds to Watt-hours
Foot-pound and Watt-hour both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Work from one pound-force over one foot, and a watt-hour is 3,600 joules.
Formula
watt-hours = foot-pounds × 0.000376616096759
This factor comes from each unit's defined relationship to the category's base unit: 1 foot-pound equals 1.35581794833 base units, and 1 watt-hour equals 3600 base units, so dividing one by the other gives the direct foot-pound-to-watt-hour factor of 0.000376616096759.
Simple example
1 ft-lb × 0.0003766160968 = 0.0003766161 Wh
1 foot-pound = 0.0003766161 watt-hours.
Real-world example
100 ft-lb × 0.0003766160968 = 0.0376616097 Wh
100 foot-pounds = 0.0376616097 watt-hours.
Conversion table
| Foot-pound (ft-lb) | Watt-hour (Wh) |
|---|---|
| 1 ft-lb | 0.0003766161 Wh |
| 10 ft-lb | 0.003766161 Wh |
| 50 ft-lb | 0.0188308048 Wh |
| 100 ft-lb | 0.0376616097 Wh |
| 500 ft-lb | 0.1883080484 Wh |
| 1,000 ft-lb | 0.3766160968 Wh |
Reverse conversion: Watt-hour to Foot-pound
0.0003766161 Wh × 2655.223737 = 1.000000009 ft-lb
0.0003766161 watt-hours = 1.000000009 foot-pounds.
foot-pounds = watt-hours × 2655.2237374
For a page dedicated to this direction, see Watt-hour to Foot-pound.
Understanding the Foot-pound (ft-lb)
Work from one pound-force over one foot.
Understanding the Watt-hour
Watt-hour (Wh) measures energy. The energy delivered by one watt of power sustained for one hour — equal to 3,600 joules. It is classified as a metric derived energy unit.
Where it's used: Universal — standard consumer-electronics and battery energy unit worldwide
Wh vs. kWh. The same unit at different scales: 1,000 Wh equals 1 kWh. Wh suits small consumer-electronics batteries; kWh is used for household electricity billing and larger energy storage.
Uses of the Watt-hour today
- Phone, laptop, and power-bank battery capacity ratings
- Electric-vehicle battery capacity specifications
- Small-scale renewable energy (solar panel) output ratings
Watt-hour — sources
- BIPM SI Brochure — Watt-hour as a common energy unit derived from the coherent SI units watt and second (via the hour).
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many watt-hours are in 1 foot-pound?
1 foot-pound equals 0.0003766161 watt-hours, using the exact defined conversion factor rather than an estimate.
How do I convert foot-pound to watt-hour?
Multiply the foot-pound value by 0.0003766160968. The converter above does this instantly to whatever precision you set.
How do I convert watt-hour back to foot-pound?
Use the reverse factor: 1 watt-hour equals 2,655.223737 foot-pounds. You can also use the swap control in the converter above to flip the direction instantly.
What is a foot-pound?
Foot-pound (ft-lb) is a unit of engineering.
What is a watt-hour?
Watt-hour (Wh) measures energy. The energy delivered by one watt of power sustained for one hour — equal to 3,600 joules. It is classified as a metric derived energy unit.
Is the foot-pound to watt-hour conversion exact?
Yes. Both foot-pound and watt-hour are defined by fixed standards rather than physical artifacts, so the factor of 0.0003766160968 used above is exact to as many digits as you choose to display.
What is the difference between wh vs. kwh?
The same unit at different scales: 1,000 Wh equals 1 kWh. Wh suits small consumer-electronics batteries; kWh is used for household electricity billing and larger energy storage.