Conversion table
| Foot-pounds (ft·lb) | Joules (J) |
|---|---|
| 1 ft·lb | 1.36 |
| 10 ft·lb | 13.56 |
| 25 ft·lb | 33.9 |
| 50 ft·lb | 67.79 |
| 100 ft·lb | 135.58 |
| 250 ft·lb | 338.95 |
| 500 ft·lb | 677.91 |
| 1000 ft·lb | 1355.82 |
How to convert ft·lb to J
- ft·lb
- foot-pounds of energy you enter
- J
- the result in joules
- 1.35582
- joules in one foot-pound of energy
The energy foot-pound and the torque foot-pound share a name and the same numerical factor to the metric side, but they are different quantities. Energy is force along a line, torque is force on a lever arm. Ballistics and physics use the energy one; wrenches use the torque one.
If your value is a torque spec, use newton-metres to foot-pounds instead, which converts twist. This page converts energy.
Frequently asked questions
How many joules is 100 ft-lb of energy?
100 foot-pounds of energy is about 135.6 joules.
How many foot-pounds is 200 J?
200 joules is about 147.5 foot-pounds of energy.
Is this the same as the torque foot-pound?
No. The factor to metric is the same number, but energy and torque are different quantities, so keep them apart.
Why is muzzle energy in foot-pounds?
It is customary in the shooting world; the figure is the kinetic energy of the projectile, which converts straight to joules here.
What is 1 joule in foot-pounds of energy?
One joule is about 0.7376 foot-pounds of energy.