Convert Kilotons of TNT to Attojoules
Convert Kilotons of TNT (kt(TNT)) to Attojoules (aJ) instantly and accurately.
Conversion Formula
aJ = kt(TNT) × 4.184000000e+30
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 Attojoules
An attojoule (aJ) is 10⁻¹⁸ J - the scale of individual X-ray photons and superconducting qubit circuits. A 1 keV X-ray photon carries 160 aJ; a visible green photon (~550 nm) carries ~0.36 aJ. Josephson junction energies in superconducting qubits are set in tens to hundreds of aJ to achieve quantum coherence at millikelvin temperatures. XRISM's cryogenic TES X-ray spectrometer resolves individual photon energies at the hundreds-of-aJ level with ~7 eV FWHM resolution. 1 aJ = 10⁻¹⁸ J = 6.242 eV.
Quick Reference Table
| Kilotons of TNT (kt(TNT)) | Attojoules (aJ) |
|---|---|
| 1 kt(TNT) | 4.184 × 1030 aJ |
| 2 kt(TNT) | 8.368 × 1030 aJ |
| 5 kt(TNT) | 2.092 × 1031 aJ |
| 10 kt(TNT) | 4.184 × 1031 aJ |
| 25 kt(TNT) | 1.046 × 1032 aJ |
| 50 kt(TNT) | 2.092 × 1032 aJ |
| 100 kt(TNT) | 4.184 × 1032 aJ |