Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 kJ | 0.737561 ft·lb | |
| 0.01 kJ | 7.37561 ft·lb | |
| 0.1 kJ | 73.7561 ft·lb | |
| 1 kJ | 737.561 ft·lb | |
| 5 kJ | 3687.81 ft·lb | |
| 10 kJ | 7375.61 ft·lb | |
| 50 kJ | 36878.1 ft·lb | |
| 100 kJ | 73756.1 ft·lb | |
| 1000 kJ | 737561 ft·lb |
Formula: Foot-Pound = Kilojoule × 737.6
Multiply any kilojoule value by 737.6 to get foot-pound.
Reverse: Kilojoule = Foot-Pound × 0.001356
Common kilojoule values — factor: 1 kJ = 737.6 ft·lb
| Kilojoule (kJ) | Foot-Pound (ft·lb) | Context |
|---|---|---|
| 0.001 kJ | 0.7376 ft·lb | 1 J |
| 0.01 kJ | 7.376 ft·lb | 10 J |
| 0.1 kJ | 73.76 ft·lb | 100 J |
| 1 kJ | 737.6 ft·lb | 1 kJ |
| 4.184 kJ | 3,086 ft·lb | 1 kcal |
| 10 kJ | 7,376 ft·lb | 10 kJ |
| 100 kJ | 7.376e+04 ft·lb | 100 kJ |
| 1,000 kJ | 7.376e+05 ft·lb | 1 MJ |
| 3,600 kJ | 2.655e+06 ft·lb | 1 kWh |
| 1e+04 kJ | 7.376e+06 ft·lb | 10 MJ |
| 1e+05 kJ | 7.376e+07 ft·lb | 100 MJ |
| 1e+06 kJ | 7.376e+08 ft·lb | 1 GJ |
| 1e+08 kJ | 7.376e+10 ft·lb | 100 GJ |
| 1.000e+10 kJ | 7.376e+12 ft·lb | 10 TJ |
| 1.000e+12 kJ | 7.376e+14 ft·lb | 1 PJ |
1 kJ = 737.6 ft·lb. Memorize for instant estimates.
Use 737.6 as a quick mental multiplier.
Multiply result by 0.001356 to recover the original kJ value.
Labels food energy in kJ for metric-market nutritional information.
Calculates reaction heat, enthalpy changes, and process energy in kJ.
Measures athlete metabolic rate and substrate oxidation in kJ.
Teaches heat transfer, steam tables, and engine cycles using kJ.
Prescribes energy intake using kJ in countries using metric labels.
Calculates heat duty for reactors, heat exchangers, and distillation in kJ.
The kilojoule (kJ) equals 1,000 joules and is the practical energy unit for food, chemistry, and heating applications in metric countries. Food energy labels in Australia, Europe, and most of the world use kilojoules.
A dietary calorie (kcal) equals 4.184 kJ. A can of soda contains about 600 kJ. The specific heat of water (4.184 kJ/kg·°C) means heating 1 liter of water by 1°C requires 4.184 kJ.
Interesting fact: An average adult needs about 8,000-10,000 kJ (2,000-2,400 kcal) per day. Running a marathon burns approximately 12,500 kJ.
The foot-pound (ft·lb) is an Imperial unit of energy equal to the work done when a force of one pound-force moves an object one foot, equaling 1.35582 joules. It has been used in British and American engineering since the 18th century.
Foot-pounds are standard in US mechanical engineering for torque specifications, engine output (often ft·lb of torque), and ballistic energy measurements. Rifle bullet energies are commonly quoted in foot-pounds in American publications.
Interesting fact: A typical 9mm pistol bullet has about 350 ft·lb of muzzle energy. The torque specification for tightening a car wheel bolt is typically 80–100 ft·lb. One horsepower equals 550 ft·lb per second.
Converting kilojoule to foot-pound is common across energy, nutrition, engineering, and science. Different sectors use different energy units — joules in physics, kcal in nutrition, kWh in electricity, and BTU in HVAC — making accurate conversion essential for cross-disciplinary work and international comparisons.
Quick reference: 5 kJ = 3688 ft·lb and 10 kJ = 7376 ft·lb. Reverse: 1 ft·lb = 0.001356 kJ. Exact factor: 1 kJ = 737.6 ft·lb.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.