Convert Kilotons of TNT to Nanojoules
Convert Kilotons of TNT (kt(TNT)) to Nanojoules (nJ) instantly and accurately.
Conversion Formula
nJ = kt(TNT) × 4.184000000e+21
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 Nanojoules
A nanojoule (nJ) is 10⁻⁹ J - the scale of ultrashort laser pulses, flash memory write operations, and cellular ATP reserves. A Ti:sapphire laser oscillator produces pulses of 1-20 nJ at 80 MHz. Flash NAND programming costs ~1-10 nJ/bit written; a read is ~0.1 nJ/bit. The total ATP energy stored in a single red blood cell is ~1-5 nJ. The kinetic energy of a 1 µg particle at 1.4 m/s is ~1 nJ, illustrating that nanojoules describe real nanoscale mechanical events. 1 nJ = 10⁻⁹ J.
Quick Reference Table
| Kilotons of TNT (kt(TNT)) | Nanojoules (nJ) |
|---|---|
| 1 kt(TNT) | 4.184 × 1021 nJ |
| 2 kt(TNT) | 8.368 × 1021 nJ |
| 5 kt(TNT) | 2.092 × 1022 nJ |
| 10 kt(TNT) | 4.184 × 1022 nJ |
| 25 kt(TNT) | 1.046 × 1023 nJ |
| 50 kt(TNT) | 2.092 × 1023 nJ |
| 100 kt(TNT) | 4.184 × 1023 nJ |