Convert Megajoules to Kilotons of TNT
Convert Megajoules (MJ) to Kilotons of TNT (kt(TNT)) instantly and accurately.
Conversion Formula
kt(TNT) = MJ × 2.390057361e-7
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.
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
| Megajoules (MJ) | Kilotons of TNT (kt(TNT)) |
|---|---|
| 1 MJ | 2.39 × 10-7 kt(TNT) |
| 2 MJ | 4.78 × 10-7 kt(TNT) |
| 5 MJ | 1.195 × 10-6 kt(TNT) |
| 10 MJ | 2.39 × 10-6 kt(TNT) |
| 25 MJ | 5.975 × 10-6 kt(TNT) |
| 50 MJ | 1.195 × 10-5 kt(TNT) |
| 100 MJ | 2.39 × 10-5 kt(TNT) |