Convert Kilotons of TNT to Microjoules
Convert Kilotons of TNT (kt(TNT)) to Microjoules (µJ) instantly and accurately.
Conversion Formula
µJ = kt(TNT) × 4.184000000e+18
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 Microjoules
A microjoule (µJ) is 10⁻⁶ J - the scale of precision laser ablation, ESD damage events, and individual LIDAR pulses. LASIK eye surgery delivers 0.5-2 µJ per pulse at 193 nm, ablating ~0.25 µm of corneal tissue per pulse. ESD events that destroy IC gates correspond to 1-1,000 µJ; the Human Body Model test discharges ~500 µJ at 2 kV. Q-switched microchip laser pulses for rangefinding are 1-100 µJ. The kinetic energy of a 1 mg grain of sand falling 10 cm is mgh ≈ 0.98 µJ. 1 µJ = 10⁻⁶ J.
Quick Reference Table
| Kilotons of TNT (kt(TNT)) | Microjoules (µJ) |
|---|---|
| 1 kt(TNT) | 4.184 × 1018 µJ |
| 2 kt(TNT) | 8.368 × 1018 µJ |
| 5 kt(TNT) | 2.092 × 1019 µJ |
| 10 kt(TNT) | 4.184 × 1019 µJ |
| 25 kt(TNT) | 1.046 × 1020 µJ |
| 50 kt(TNT) | 2.092 × 1020 µJ |
| 100 kt(TNT) | 4.184 × 1020 µJ |