How to convert foot-pounds to joules
J = ft⋅lbf × 1.355817948Multiply the value in foot-pounds by 1.355817948. To go the other way, multiply by 0.7375621493 (or divide by 1.355817948).
A foot-pound is larger than a joule: one foot-pound contains 1.355817948 joules.
Worked examples
- 1 foot-pound1 ft⋅lbf × 1.355817948 = 1.355817948 J
- 5 foot-pounds5 ft⋅lbf × 1.355817948 = 6.779089742 J
- 10 foot-pounds10 ft⋅lbf × 1.355817948 = 13.55817948 J
- 20 foot-pounds20 ft⋅lbf × 1.355817948 = 27.11635897 J
- 100 foot-pounds100 ft⋅lbf × 1.355817948 = 135.5817948 J
Foot-pounds to joules conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Foot-pounds (ft⋅lbf) | Joules (J) |
|---|---|
| 0.1 ft⋅lbf | 0.13558179 J |
| 0.25 ft⋅lbf | 0.33895449 J |
| 0.5 ft⋅lbf | 0.67790897 J |
| 1 ft⋅lbf | 1.3558179 J |
| 2 ft⋅lbf | 2.7116359 J |
| 3 ft⋅lbf | 4.0674538 J |
| 4 ft⋅lbf | 5.4232718 J |
| 5 ft⋅lbf | 6.7790897 J |
| 6 ft⋅lbf | 8.1349077 J |
| 7 ft⋅lbf | 9.4907256 J |
| 8 ft⋅lbf | 10.846544 J |
| 9 ft⋅lbf | 12.202362 J |
| 10 ft⋅lbf | 13.558179 J |
| Foot-pounds (ft⋅lbf) | Joules (J) |
|---|---|
| 12 ft⋅lbf | 16.269815 J |
| 15 ft⋅lbf | 20.337269 J |
| 20 ft⋅lbf | 27.116359 J |
| 25 ft⋅lbf | 33.895449 J |
| 30 ft⋅lbf | 40.674538 J |
| 40 ft⋅lbf | 54.232718 J |
| 50 ft⋅lbf | 67.790897 J |
| 75 ft⋅lbf | 101.68635 J |
| 100 ft⋅lbf | 135.58179 J |
| 250 ft⋅lbf | 338.95449 J |
| 500 ft⋅lbf | 677.90897 J |
| 1,000 ft⋅lbf | 1,355.8179 J |
About the units
Foot-pound (ft⋅lbf)
The foot-pound (ft⋅lbf) is a unit of energy in the US customary system. One foot-pound equals 1.355817948 joules (J).
Joule (J)
The SI unit of energy: the work done by a force of one newton over one metre, or one watt for one second. Lifting an apple by one metre takes about 1 J.
Frequently asked questions
How many joules are in one foot-pound?
There are 1.355817948 joules in one foot-pound, and this value is exact by definition.
How do I convert foot-pounds to joules?
Multiply the number of foot-pounds by 1.355817948. For example, 10 ft⋅lbf × 1.355817948 = 13.55817948 J.
How many foot-pounds are in one joule?
One joule equals 0.7375621493 foot-pounds. That is the reverse factor, 1 ÷ 1.355817948.
What is 10 foot-pounds in joules?
10 ft⋅lbf = 13.55817948 J.
Is this ft⋅lbf to J converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.