Home› Conversions› Energy› Joules to Foot-pounds
Energy
Joules to Foot-pounds
Convert joules (J) to foot-pounds (ft·lb). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 J = 0.737561 ft·lb
Joules to Foot-pounds Conversion Table
Common values, ready to copy:
| joules | foot-pounds |
|---|---|
| 1 J | 0.737561 ft·lb |
| 2 J | 1.4751 ft·lb |
| 5 J | 3.6878 ft·lb |
| 10 J | 7.3756 ft·lb |
| 25 J | 18.439 ft·lb |
| 50 J | 36.8781 ft·lb |
| 100 J | 73.7561 ft·lb |
| 1,000 J | 737.56 ft·lb |
Formula
foot-pounds = joules × 7.37561033e-1
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 Joules and Foot-pounds
Joules (J): The SI unit of energy; named for James Prescott Joule, whose 19th-century experiments established the equivalence of mechanical work and heat. Common uses: Physics calculations, food calorie labeling in metric countries (kilojoules), battery capacity, and chemistry.
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.
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 foot-pounds = joules × 7.37561033e-1, 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 joules and foot-pounds 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.