Convert Kilotons of TNT to Exajoules
Convert Kilotons of TNT (kt(TNT)) to Exajoules (EJ) instantly and accurately.
Conversion Formula
EJ = kt(TNT) × 4.184000000e-6
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.
About Exajoules
An exajoule (EJ) is 10¹⁸ J - the scale of global energy consumption. World primary energy supply in 2022 was ~580-610 EJ: coal ~160 EJ; oil ~190 EJ; gas ~145 EJ; nuclear ~26 EJ; wind ~8 EJ; solar PV ~8 EJ. Global electricity generation of ~29,000 TWh = 104 EJ. Solar energy incident on Earth's atmosphere is ~5.5 × 10⁶ EJ/year - approximately 9,000× total human demand. Annual fossil fuel combustion releases ~490 EJ/year, producing ~36.8 Gt CO₂. 1 EJ = 10¹⁸ J = 277.78 TWh = 238.85 Mtoe.
Quick Reference Table
| Kilotons of TNT (kt(TNT)) | Exajoules (EJ) |
|---|---|
| 1 kt(TNT) | 4.184 × 10-6 EJ |
| 2 kt(TNT) | 8.368 × 10-6 EJ |
| 5 kt(TNT) | 2.092 × 10-5 EJ |
| 10 kt(TNT) | 4.184 × 10-5 EJ |
| 25 kt(TNT) | 0.0001046 EJ |
| 50 kt(TNT) | 0.0002092 EJ |
| 100 kt(TNT) | 0.0004184 EJ |