Convert Kilotons of TNT to Kilojoules
Convert Kilotons of TNT (kt(TNT)) to Kilojoules (kJ) instantly and accurately.
Conversion Formula
kJ = kt(TNT) × 4184000000
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 Kilojoules
A kilojoule (kJ) is exactly 1,000 J and is the standard energy unit for food and physical chemistry. EU, Australian, and NZ food labels are mandatory in kJ: recommended adult intake is ~8,400 kJ/day. Bond dissociation energies: C-H bond 413 kJ/mol; C=C double bond 614 kJ/mol; N≡N triple bond 945 kJ/mol. Specific heat of water: 4.184 kJ/(kg·K). A cyclist riding at 150 W for one hour expends 540 kJ. Charpy and Izod impact toughness tests record results in J and kJ. 1 kJ = 1,000 J = 239.0 cal = 0.94782 BTU = 0.27778 Wh.
Quick Reference Table
| Kilotons of TNT (kt(TNT)) | Kilojoules (kJ) |
|---|---|
| 1 kt(TNT) | 4.184 × 109 kJ |
| 2 kt(TNT) | 8.368 × 109 kJ |
| 5 kt(TNT) | 2.092 × 1010 kJ |
| 10 kt(TNT) | 4.184 × 1010 kJ |
| 25 kt(TNT) | 1.046 × 1011 kJ |
| 50 kt(TNT) | 2.092 × 1011 kJ |
| 100 kt(TNT) | 4.184 × 1011 kJ |