How to convert foot-pounds to joules
Formula: J = ft⋅lbf × 1.35582
Worked example: 100 ft⋅lbf → 100 × 1.35582 = 135.582 J
Foot-pounds to joules conversion chart
| Foot-pounds (ft⋅lbf) | Joules (J) |
|---|---|
| 1 ft⋅lbf | 1.35582 J |
| 2 ft⋅lbf | 2.71164 J |
| 3 ft⋅lbf | 4.06745 J |
| 4 ft⋅lbf | 5.42327 J |
| 5 ft⋅lbf | 6.77909 J |
| 6 ft⋅lbf | 8.13491 J |
| 7 ft⋅lbf | 9.49073 J |
| 8 ft⋅lbf | 10.8465 J |
| 9 ft⋅lbf | 12.2024 J |
| 10 ft⋅lbf | 13.5582 J |
| 12 ft⋅lbf | 16.2698 J |
| 15 ft⋅lbf | 20.3373 J |
| 20 ft⋅lbf | 27.1164 J |
| 25 ft⋅lbf | 33.8954 J |
| 30 ft⋅lbf | 40.6745 J |
| 40 ft⋅lbf | 54.2327 J |
| 50 ft⋅lbf | 67.7909 J |
| 75 ft⋅lbf | 101.686 J |
| 100 ft⋅lbf | 135.582 J |
| 250 ft⋅lbf | 338.954 J |
| 500 ft⋅lbf | 677.909 J |
| 1,000 ft⋅lbf | 1,355.82 J |
What is a foot-pound?
The foot-pound is the work done by a one-pound force over one foot, about 1.356 joules. It measures the energy of bullets and air guns in the US; the same unit also expresses torque on wrenches and engines.
What is a joule?
The joule is the SI unit of energy: the work done by a force of one newton over one meter, or one watt for one second. It is small; lifting an apple about one meter takes roughly one joule.