Convert Foot-Pound-Force to Megatons of TNT
Convert Foot-Pound-Force (ft·lbf) to Megatons of TNT (Mt(TNT)) instantly and accurately.
Conversion Formula
Mt(TNT) = ft·lbf × 3.240482668e-16
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 Megatons of TNT
A megaton of TNT (Mt(TNT)) = 10⁶ tons of TNT = exactly 4.184 PJ. The Soviet Tsar Bomba (1961) yielded ~50 Mt - the largest human-made explosion ever, with a fireball 8 km in diameter. Castle Bravo (1954) yielded ~15 Mt, 2.5× its 6 Mt design yield. Modern thermonuclear warheads typically range from 0.1-1.2 Mt. The 2011 Tōhoku earthquake released ~500 Mt in seismic energy. The Krakatoa 1883 eruption released ~200 Mt; Tambora 1815 ~33,000 Mt. 1 Mt(TNT) = 4.184 PJ = 1,162,800 MWh.
Quick Reference Table
| Foot-Pound-Force (ft·lbf) | Megatons of TNT (Mt(TNT)) |
|---|---|
| 1 ft·lbf | 3.24 × 10-16 Mt(TNT) |
| 2 ft·lbf | 6.481 × 10-16 Mt(TNT) |
| 5 ft·lbf | 1.62 × 10-15 Mt(TNT) |
| 10 ft·lbf | 3.24 × 10-15 Mt(TNT) |
| 25 ft·lbf | 8.101 × 10-15 Mt(TNT) |
| 50 ft·lbf | 1.62 × 10-14 Mt(TNT) |
| 100 ft·lbf | 3.24 × 10-14 Mt(TNT) |