Convert Foot-Pound-Force to Tons of TNT
Convert Foot-Pound-Force (ft·lbf) to Tons of TNT (t(TNT)) instantly and accurately.
Conversion Formula
t(TNT) = ft·lbf × 3.240482668e-10
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 Tons of TNT
A ton of TNT is an energy unit defined as exactly 10⁹ thermochemical calories = 4.184 GJ. The Trinity test (first nuclear weapon, 1945) yielded ~21 kilotons TNT = 87.9 TJ. The Tsar Bomba yielded ~50 megatons TNT = 209 PJ - the largest human-made explosion in history. Hiroshima's Little Boy yielded ~15 kilotons = 62.8 TJ. The Tunguska 1908 airburst released ~10-15 megatons TNT. Earthquake magnitude 6.0 releases ~63 kilotons TNT equivalent in seismic energy. 1 t(TNT) = 4.184 GJ = 4,184 MJ = 1,162.8 kWh.
Quick Reference Table
| Foot-Pound-Force (ft·lbf) | Tons of TNT (t(TNT)) |
|---|---|
| 1 ft·lbf | 3.24 × 10-10 t(TNT) |
| 2 ft·lbf | 6.481 × 10-10 t(TNT) |
| 5 ft·lbf | 1.62 × 10-9 t(TNT) |
| 10 ft·lbf | 3.24 × 10-9 t(TNT) |
| 25 ft·lbf | 8.101 × 10-9 t(TNT) |
| 50 ft·lbf | 1.62 × 10-8 t(TNT) |
| 100 ft·lbf | 3.24 × 10-8 t(TNT) |