Foot-pounds Force to Joules Converter
1 foot-pound force ≈ 1.35581795 joules
Energy and torque share these dimensions. For fastener torque see the Torque category, where the same quantity is written lbf·ft.
1 foot-pound force equals 1.35582 joules
How to convert foot-pounds force to joules
Calories here are thermochemical (4.184 J), while BTU uses the International Table definition. A kilowatt-hour is energy (3.6 MJ), not power; a food Calorie is a kilocalorie.
J = ft·lbf × 1.355817948One foot-pound force is 1.355817948 joules, so a single multiplication converts any value.
13.5582 J ≈ 10 × 1.355817948Energy and torque share these dimensions. For fastener torque see the Torque category, where the same quantity is written lbf·ft.
Foot-pounds force to joules conversion table
Common values in foot-pounds force, converted to joules.
| Foot-pounds force (ft·lbf) | Joules (J) |
|---|---|
| 1 | 1.3558179 |
| 2 | 2.7116359 |
| 3 | 4.0674538 |
| 4 | 5.4232718 |
| 5 | 6.7790897 |
| 10 | 13.558179 |
| 20 | 27.116359 |
| 25 | 33.895449 |
| 50 | 67.790897 |
| 100 | 135.58179 |
| 250 | 338.95449 |
| 500 | 677.90897 |
| 1,000 | 1,355.8179 |
About these units
foot-pound forceft·lbf
The work done by one pound-force acting through one foot.
jouleJ
The SI derived unit of energy: one newton acting through one metre.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.