Convert Megatons of TNT to Millijoules
Convert Megatons of TNT (Mt(TNT)) to Millijoules (mJ) instantly and accurately.
Conversion Formula
mJ = Mt(TNT) × 4.184000000e+18
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.
About Millijoules
A millijoule (mJ) is 10⁻³ J - the scale of surgical lasers, spark ignition, and the kinetic energy of small everyday objects. Nd:YAG lasers for ophthalmology and tattoo removal deliver 10-200 mJ per pulse. The minimum spark energy to ignite methane-air is ~0.29 mJ; an automotive spark plug discharges 30-60 mJ per cycle. A 2 g mosquito flying at 1 m/s has kinetic energy ½ × 0.002 × 1² = 1 mJ. Electrocautery monopolar pulses deliver 50-500 mJ to coagulate blood vessels. 1 mJ = 10⁻³ J = 0.2390 cal.
Quick Reference Table
| Megatons of TNT (Mt(TNT)) | Millijoules (mJ) |
|---|---|
| 1 Mt(TNT) | 4.184 × 1018 mJ |
| 2 Mt(TNT) | 8.368 × 1018 mJ |
| 5 Mt(TNT) | 2.092 × 1019 mJ |
| 10 Mt(TNT) | 4.184 × 1019 mJ |
| 25 Mt(TNT) | 1.046 × 1020 mJ |
| 50 Mt(TNT) | 2.092 × 1020 mJ |
| 100 Mt(TNT) | 4.184 × 1020 mJ |