Convert Foot-Pound Force to Joule
Live bidirectional calculator for Foot-Pounds Force (ft·lbf) and Joules (J) with verified formula and conversion charts.
Energy9 units
How the Calculation Works (Linear Scaling)
Since 1 Foot-Pound Force = 1.355818 Joules, multiply the value in Foot-Pounds Force by 1.355818.
Foot-Pound Force to Joule Conversion Table
Precomputed values for quick reference and printing.
| Foot-Pound Force | Joule |
|---|---|
| 1 ft·lbf | 1.3558 J |
| 2 ft·lbf | 2.7116 J |
| 3 ft·lbf | 4.0675 J |
| 4 ft·lbf | 5.4233 J |
| 5 ft·lbf | 6.7791 J |
| 6 ft·lbf | 8.1349 J |
| 7 ft·lbf | 9.4907 J |
| 8 ft·lbf | 10.8465 J |
| 9 ft·lbf | 12.2024 J |
| 10 ft·lbf | 13.5582 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 | 101.6863 J |
| 100 ft·lbf | 135.5818 J |
| Joule | Foot-Pound Force |
|---|---|
| 1 J | 0.7376 ft·lbf |
| 2 J | 1.4751 ft·lbf |
| 3 J | 2.2127 ft·lbf |
| 4 J | 2.9502 ft·lbf |
| 5 J | 3.6878 ft·lbf |
| 6 J | 4.4254 ft·lbf |
| 7 J | 5.1629 ft·lbf |
| 8 J | 5.9005 ft·lbf |
| 9 J | 6.6381 ft·lbf |
| 10 J | 7.3756 ft·lbf |
| 15 J | 11.0634 ft·lbf |
| 20 J | 14.7512 ft·lbf |
| 25 J | 18.4391 ft·lbf |
| 30 J | 22.1269 ft·lbf |
| 40 J | 29.5025 ft·lbf |
| 50 J | 36.8781 ft·lbf |
| 75 J | 55.3172 ft·lbf |
| 100 J | 73.7562 ft·lbf |
About Foot-Pound Force (ft·lbf)
The work done by a force of one pound-force acting through a displacement of one foot (≈ 1.355818 J).
History: Traditional imperial unit of mechanical work and kinetic energy in English engineering.
Common Uses: Firearm muzzle energies, mechanical torque work equivalents.
About Joule (J)
The SI coherent derived unit of energy, equal to the work done by a force of one newton over a distance of one meter (1 N·m or 1 W·s).
History: Named in honor of English physicist James Prescott Joule for his experiments on the mechanical equivalent of heat.
Common Uses: Physics, mechanical work, kinetic energy, laser pulse energy.
❓ Frequently Asked Questions
How many Joules are in 1 Foot-Pound Force?
There are exactly 1.355818 Joules in 1 Foot-Pound Force (1 ft·lbf = 1.355818 J).
What is the formula to convert Foot-Pound Force to Joule?
The formula is: Joule = Foot-Pound Force × 1.355818. Since 1 Foot-Pound Force = 1.355818 Joules, multiply the value in Foot-Pounds Force by 1.355818.
How do I convert 1 ft·lbf to J manually?
To convert 1 ft·lbf to J: apply the formula Joule = Foot-Pound Force × 1.355818. Substituting gives: 1 × 1.355818 = 1.3558 J.