Convert Foot-Pound-Force to Kilotons of TNT
Convert Foot-Pound-Force (ft·lbf) to Kilotons of TNT (kt(TNT)) instantly and accurately.
Conversion Formula
kt(TNT) = ft·lbf × 3.240482668e-13
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 Kilotons of TNT
A kiloton of TNT (kt(TNT)) = 10³ tons of TNT = exactly 4.184 TJ. It is the standard unit for sub-megaton nuclear weapon yields. Hiroshima's Little Boy: ~12-18 kt; Nagasaki's Fat Man: ~19-23 kt. The W88 warhead (Trident II) is ~475 kt; the W76 is ~100 kt. The Beirut port explosion (2020): estimated 0.5-1.1 kt. A magnitude 5.0 earthquake releases ~0.5-2 kt of seismic energy. A kiloton blast creates a fireball ~90-100 m radius and a lethal thermal radius of ~1-2 km. 1 kt(TNT) = 4.184 TJ = 1,162.8 MWh.
Quick Reference Table
| Foot-Pound-Force (ft·lbf) | Kilotons of TNT (kt(TNT)) |
|---|---|
| 1 ft·lbf | 3.24 × 10-13 kt(TNT) |
| 2 ft·lbf | 6.481 × 10-13 kt(TNT) |
| 5 ft·lbf | 1.62 × 10-12 kt(TNT) |
| 10 ft·lbf | 3.24 × 10-12 kt(TNT) |
| 25 ft·lbf | 8.101 × 10-12 kt(TNT) |
| 50 ft·lbf | 1.62 × 10-11 kt(TNT) |
| 100 ft·lbf | 3.24 × 10-11 kt(TNT) |