Joules to Foot-Pounds Converter
Convert joules to foot-pounds — divide by 1.35582. Results update as you type; exact factors shown.
One joule is 0.7376 foot-pounds — see the exact factor, not a rounded rule of thumb.
How the joules to foot-pounds converter works
Energy converts through the joule. A thermochemical calorie is exactly 4.184 J, so a food Calorie (kcal) is 4.184 kJ. A kilowatt-hour is exactly 3.6 MJ. A BTU is 1,055.056 J and a US therm is 100,000 BTU.
The US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common energy conversions
| From | To | Units |
|---|---|---|
| 1 J | 0.7376 ft·lb | joule to foot-pounds |
| 10 J | 7.3756 ft·lb | joules to foot-pounds |
| 50 J | 36.8781 ft·lb | joules to foot-pounds |
| 100 J | 73.7562 ft·lb | joules to foot-pounds |
| 500 J | 368.7811 ft·lb | joules to foot-pounds |
| 1,000 J | 737.5621 ft·lb | joules to foot-pounds |
| 1,356 J | 1,000.1343 ft·lb | joules to foot-pounds |
| 2,000 J | 1,475.1243 ft·lb | joules to foot-pounds |
| 3,525 J | 2,599.9066 ft·lb | joules to foot-pounds |
| 5,000 J | 3,687.8107 ft·lb | joules to foot-pounds |
| 10,000 J | 7,375.6215 ft·lb | joules to foot-pounds |
| 100,000 J | 73,756.2149 ft·lb | joules to foot-pounds |
Units in this converter and their exact factors
| Unit | Symbol | One unit in joules |
|---|---|---|
| joule | J | 1 joule |
| kilojoule | kJ | 1,000 joule |
| megajoule | MJ | 1,000,000 joule |
| calorie (thermochemical) | cal | 4.184 joule |
| kilocalorie (food Calorie) | kcal | 4,184 joule |
| watt-hour | Wh | 3,600 joule |
| kilowatt-hour | kWh | 3,600,000 joule |
| British thermal unit | BTU | 1,055.05585262 joule |
| therm (US) | thm | 105,505,585.262 joule |
| foot-pound | ft·lb | 1.3558179483 joule |
FAQFrequently asked questions about energy conversion
How many foot-pounds in a joule?
0.7376 ft·lb.
What is 1,356 J?
About 1,000 foot-pounds.
What is a typical muzzle energy?
A .308 rifle round is around 3,500 J, or 2,600 ft·lb.
Why does the US use foot-pounds?
It is the natural energy unit in a system where force is in pounds and distance in feet.
Is a foot-pound large?
Small — about the energy of dropping a one-pound weight one foot. A joule is smaller still.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.