Convert energy units — joules, kilowatt-hours, calories, BTU, electron volts and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 ft·lb | 1.35582e-09 MJ | |
| 0.01 ft·lb | 1.35582e-08 MJ | |
| 0.1 ft·lb | 1.35582e-07 MJ | |
| 1 ft·lb | 1.35582e-06 MJ | |
| 5 ft·lb | 6.7791e-06 MJ | |
| 10 ft·lb | 1.35582e-05 MJ | |
| 50 ft·lb | 6.7791e-05 MJ | |
| 100 ft·lb | 0.000135582 MJ | |
| 1000 ft·lb | 0.00135582 MJ |
Formula: Megajoule = Foot-Pound × 1.3558e-6
Multiply any foot-pound value by 1.3558e-6 to get megajoule.
Reverse: Foot-Pound = Megajoule × 737,600
Common foot-pound values — factor: 1 ft·lb = 1.3558e-6 MJ
| Foot-Pound (ft·lb) | Megajoule (MJ) | Context |
|---|---|---|
| 1 ft·lb | 1.356e-06 MJ | 1 ft·lb |
| 10 ft·lb | 1.356e-05 MJ | 10 ft·lb |
| 100 ft·lb | 0.0001356 MJ | 100 ft·lb |
| 350 ft·lb | 0.0004745 MJ | 9mm pistol |
| 550 ft·lb | 0.0007457 MJ | 1 HP/s |
| 1,000 ft·lb | 0.001356 MJ | Rifle bullet |
| 3,000 ft·lb | 0.004067 MJ | High-power rifle |
| 1e+04 ft·lb | 0.01356 MJ | 10 kft·lb |
| 1e+05 ft·lb | 0.1356 MJ | 100 kft·lb |
| 1e+06 ft·lb | 1.356 MJ | 1 Mft·lb |
| 1e+07 ft·lb | 13.56 MJ | 10 Mft·lb |
| 1.000e+09 ft·lb | 1,356 MJ | 1 Gft·lb |
| 1.000e+12 ft·lb | 1.356e+06 MJ | 1 Tft·lb |
| 1.000e+15 ft·lb | 1.356e+09 MJ | 1 Pft·lb |
| 1.000e+18 ft·lb | 1.356e+12 MJ | 1 Eft·lb |
1 ft·lb = 1.3558e-6 MJ. Memorize for instant estimates.
Use 1.3558e-6 as a quick mental multiplier.
Multiply result by 737,600 to recover the original ft·lb value.
Torques bolts and fasteners to specified ft·lb values using a torque wrench.
Rates firearm muzzle energy in ft·lb for US ammunition comparisons.
Calculates impact energy absorption in ft·lb for US building codes.
Measures and compares engine torque output in ft·lb on a dyno.
Specifies fall arrest and impact energy in ft·lb for OSHA compliance.
Evaluates hunting cartridge terminal energy in ft·lb for ethical dispatch.
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.
The megajoule (MJ) equals 1,000,000 joules and is used for large-scale energy measurements in engineering, transportation, and industrial processes.
One liter of petrol contains about 34 MJ of chemical energy. A bolt of lightning releases about 1-5 MJ. An adult's daily food intake is roughly 8-10 MJ. Electric vehicle batteries are typically rated at 40-100 MJ (11-28 kWh).
Interesting fact: The kinetic energy of a 1,000 kg car traveling at 100 km/h is about 0.385 MJ. TNT explosive releases about 4.6 MJ per kilogram when detonated.
Converting foot-pound to megajoule 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 ft·lb = 6.7791e-6 MJ and 10 ft·lb = 1.3558e-5 MJ. Reverse: 1 MJ = 737,600 ft·lb. Exact factor: 1 ft·lb = 1.3558e-6 MJ.
All conversions use IEEE 754 double-precision arithmetic, accurate to at least 8 significant figures.