Convert Megajoules to Megatons of TNT
Convert Megajoules (MJ) to Megatons of TNT (Mt(TNT)) instantly and accurately.
Conversion Formula
Mt(TNT) = MJ × 2.390057361e-10
About Megajoules
A megajoule (MJ) is 10⁶ J - the scale of fuel combustion in vehicles and kinetic energy of road traffic. Energy content: 1 L diesel ~34.9 MJ; 1 L petrol ~32.2 MJ. A 1,500 kg car at 100 km/h has KE = ½ × 1,500 × 27.78² ≈ 0.579 MJ; at 200 km/h it carries 2.31 MJ - explaining crash severity's quadratic speed dependence. A 60 kWh EV battery stores 60 × 3.6 = 216 MJ. Detonation of 1 kg TNT releases 4.184 MJ. Adults at rest metabolise ~6-9 MJ/day. 1 MJ = 10⁶ J = 239.0 kcal = 0.27778 kWh = 947.8 BTU.
About Megatons of TNT
A megaton of TNT (Mt(TNT)) = 10⁶ tons of TNT = exactly 4.184 PJ. The Soviet Tsar Bomba (1961) yielded ~50 Mt - the largest human-made explosion ever, with a fireball 8 km in diameter. Castle Bravo (1954) yielded ~15 Mt, 2.5× its 6 Mt design yield. Modern thermonuclear warheads typically range from 0.1-1.2 Mt. The 2011 Tōhoku earthquake released ~500 Mt in seismic energy. The Krakatoa 1883 eruption released ~200 Mt; Tambora 1815 ~33,000 Mt. 1 Mt(TNT) = 4.184 PJ = 1,162,800 MWh.
Quick Reference Table
| Megajoules (MJ) | Megatons of TNT (Mt(TNT)) |
|---|---|
| 1 MJ | 2.39 × 10-10 Mt(TNT) |
| 2 MJ | 4.78 × 10-10 Mt(TNT) |
| 5 MJ | 1.195 × 10-9 Mt(TNT) |
| 10 MJ | 2.39 × 10-9 Mt(TNT) |
| 25 MJ | 5.975 × 10-9 Mt(TNT) |
| 50 MJ | 1.195 × 10-8 Mt(TNT) |
| 100 MJ | 2.39 × 10-8 Mt(TNT) |