Convert Kilojoules to Kilotons of TNT
Convert Kilojoules (kJ) to Kilotons of TNT (kt(TNT)) instantly and accurately.
Conversion Formula
kt(TNT) = kJ × 2.390057361e-10
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.
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
| Kilojoules (kJ) | Kilotons of TNT (kt(TNT)) |
|---|---|
| 1 kJ | 2.39 × 10-10 kt(TNT) |
| 2 kJ | 4.78 × 10-10 kt(TNT) |
| 5 kJ | 1.195 × 10-9 kt(TNT) |
| 10 kJ | 2.39 × 10-9 kt(TNT) |
| 25 kJ | 5.975 × 10-9 kt(TNT) |
| 50 kJ | 1.195 × 10-8 kt(TNT) |
| 100 kJ | 2.39 × 10-8 kt(TNT) |