Convert Foot-Pound to Joule
Use this free converter to change foot-pounds (ft·lb) into joules (J). Foot-pound and joule both measure energy. As a quick reference, 1 ft·lb equals 1.3558179 J, and 1 J equals 0.73756215 ft·lb.
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Joule (J)
1.3558179
1 ft·lb = 1.3558179 J
Energy conversion table
| Foot-Pound | Joule |
|---|---|
| 0.01 | 0.013558179 |
| 0.1 | 0.13558179 |
| 0.5 | 0.67790897 |
| 1 | 1.3558179 |
| 2 | 2.7116359 |
| 3 | 4.0674538 |
| 5 | 6.7790897 |
| 10 | 13.558179 |
| 20 | 27.116359 |
| 25 | 33.895449 |
| 50 | 67.790897 |
| 100 | 135.58179 |
| 1,000 | 1355.8179 |
How to convert Foot-Pound to Joule
Multiply the foot-pound value by 1.3558179 to get joules.
- Enter the number of foot-pounds you want to convert.
- The converter instantly shows the equivalent value in joules.
- Worked example: 15 ft·lb × 1.3558179 = 20.337269 J.
- Use the swap button to reverse the conversion (joule to foot-pound).
About these units
Foot-Pound (ft·lb)
- Definition
- A foot-pound (ft·lb) is the work done by a one-pound force acting over one foot, about 1.356 joules.
- History
- It comes from the imperial system of mechanics.
- Current use
- Foot-pounds express torque and energy in US engineering and firearms.
Joule (J)
- Definition
- The joule (J) is the SI unit of energy, the work done by a force of one newton over one meter.
- History
- Named after physicist James Prescott Joule, who studied the link between heat and work.
- Current use
- Joules measure energy, work, and heat throughout science and engineering.
Frequently asked questions
How many joules are in a foot-pound?
There are 1.3558179 J in 1 ft·lb. To convert, multiply the number of foot-pounds by 1.3558179.
How do I convert foot-pounds to joules?
Multiply the foot-pound value by 1.3558179 to get joules. For example, 10 ft·lb = 13.558179 J.
Is this foot-pound-to-joule converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Foot-Pound to other energy units
| Unit | 1 Foot-Pound equals |
|---|---|
| Joule (J) | 1.3558179 J |
| Kilojoule (kJ) | 0.0013558179 kJ |
| Calorie (cal) | 0.32404827 cal |
| Kilocalorie (kcal) | 0.00032404827 kcal |
| Watt Hour (Wh) | 0.0003766161 Wh |
| Kilowatt Hour (kWh) | 3.7662e-7 kWh |
| Electronvolt (eV) | 8.4624e+18 eV |
| British Thermal Unit (BTU) | 0.0012850675 BTU |