Convert Foot-Pound-Force to Megajoules
Convert Foot-Pound-Force (ft·lbf) to Megajoules (MJ) instantly and accurately.
Conversion Formula
MJ = ft·lbf × 1.355817948e-6
About Foot-Pound-Force
A foot-pound-force (ft·lbf) is the work done by one pound-force through one foot - exactly 1.3558179483314004 J. It is the standard torque and energy unit in US engineering. Automotive engine torque: Honda Civic ~125 lb-ft; Ford F-150 EcoBoost ~500 lb-ft. Muzzle energies: .22 LR ~140 ft·lbf; .308 Winchester ~2,600 ft·lbf; .50 BMG ~14,000 ft·lbf. Diesel pile hammers deliver 15,000-600,000 ft·lbf/blow. SAE Grade 8 bolts are specified at 7-950 ft·lbf. 1 ft·lbf = 12 in·lbf = 1.35582 J = 0.32405 cal.
About Megajoules
A megajoule (MJ) is 10⁶ J - the scale of fuel combustion in vehicles and kinetic energy of road traffic. Energy content: 1 L diesel ~34.9 MJ; 1 L petrol ~32.2 MJ. A 1,500 kg car at 100 km/h has KE = ½ × 1,500 × 27.78² ≈ 0.579 MJ; at 200 km/h it carries 2.31 MJ - explaining crash severity's quadratic speed dependence. A 60 kWh EV battery stores 60 × 3.6 = 216 MJ. Detonation of 1 kg TNT releases 4.184 MJ. Adults at rest metabolise ~6-9 MJ/day. 1 MJ = 10⁶ J = 239.0 kcal = 0.27778 kWh = 947.8 BTU.
Quick Reference Table
| Foot-Pound-Force (ft·lbf) | Megajoules (MJ) |
|---|---|
| 1 ft·lbf | 1.356 × 10-6 MJ |
| 2 ft·lbf | 2.712 × 10-6 MJ |
| 5 ft·lbf | 6.779 × 10-6 MJ |
| 10 ft·lbf | 1.356 × 10-5 MJ |
| 25 ft·lbf | 3.39 × 10-5 MJ |
| 50 ft·lbf | 6.779 × 10-5 MJ |
| 100 ft·lbf | 0.000135582 MJ |