Convert foot-pound to joule
Enter the value to convert from foot-pound to joule.
How to Convert Foot-pound to Joule
Converting foot-pound to joule is straightforward using our conversion calculator.
Conversion Formula
J = ft⋅lbf × 1.35581795Reverse conversion: Convert joule to foot-pound
Comparison: Foot-pound vs Joule
When to Use Each Unit
Foot-pound: Used in United States for mechanical work, torque specifications, ballistics, and engineering calculations.
Joule: Universal scientific unit for all forms of energy: mechanical, electrical, thermal, chemical, and nuclear energy worldwide.
Common Conversion Values
- 1 ft⋅lbf ≈ 1.356 J
- 1 ft⋅lbf ≈ 0.00128 BTU
- 1 ft⋅lbf ≈ 0.000324 kcal
- 778 ft⋅lbf ≈ 1 BTU
About Foot-pound
Definition: The foot-pound (symbol: ft⋅lbf) is the energy expended when applying one pound-force through one foot of distance.
History: Imperial unit derived from mechanical work measurements. Standard for engineering applications in imperial system.
Current Use: Used in United States for mechanical work, torque specifications, ballistics, and engineering calculations.
Examples: Bullet energy: 1000-4000 ft⋅lbf, bow arrow: 50-100 ft⋅lbf, hammer blow: 25 ft⋅lbf, car engine: 300,000 ft⋅lbf
About Joule
Definition: The joule (symbol: J) is the SI unit of energy, equal to the energy expended when applying one newton of force through one meter of distance.
History: Named after English physicist James Prescott Joule in 1889. Established the mechanical equivalent of heat and energy conservation.
Current Use: Universal scientific unit for all forms of energy: mechanical, electrical, thermal, chemical, and nuclear energy worldwide.
Examples: Apple: 350,000 J, car battery: 4.3 MJ, lightning bolt: 1-5 billion J, human daily intake: 8-10 MJ