Energy
foot-pounds to joules Converter
1 ft lb = 1.3558 J. Enter any value and the result updates instantly.
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Accuracy and rounding
Use energy units for accumulated work or heat. Do not confuse kWh with kW, which is power rather than energy.
Energy units share a fixed joule reference. Food Calories are kilocalories, while a small calorie is 4.1868 joules.
For billing, nutrition, or engineering, match the precision of the original joules data and keep the energy/power distinction explicit.
How to convert foot-pounds to joules
- Type the foot-pounds value in the calculator.
- Keep foot-pounds selected as the from unit and joules selected as the to unit.
- Use the instant result, or copy it with the copy button.
foot-pounds to joules chart
| foot-pounds | joules |
|---|---|
| 1 ft lb | 1.3558 J |
| 5 ft lb | 6.7791 J |
| 10 ft lb | 13.5582 J |
| 50 ft lb | 67.7909 J |
| 100 ft lb | 135.58 J |
Formula
J = ft lb x 1.355817948331
Example: 1 ft lb = 1.3558 J.
Source
Energy factors from NIST SI conversion tables, using the joule as the shared reference unit.
Common questions
How do I convert foot-pounds to joules?
Enter the foot-pounds value in the converter, or multiply by the factor shown in the formula. 1 ft lb = 1.3558 J.
What should I watch out for?
Do not confuse energy with power: kWh is accumulated energy, while kW is a rate of energy transfer.
Where does this energy conversion come from?
Energy factors from NIST SI conversion tables, using the joule as the shared reference unit. ConverterBase uses stable definitions and fixed conversion factors, not live or rounded market data.