Convert Megatons of TNT to Femtojoules
Convert Megatons of TNT (Mt(TNT)) to Femtojoules (fJ) instantly and accurately.
Conversion Formula
fJ = Mt(TNT) × 4.184000000e+30
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 Femtojoules
A femtojoule (fJ) is 10⁻¹⁵ J - the scale of gamma-ray photons, molecular motor work, and state-of-the-art digital logic. The electron rest-mass energy is 81.87 fJ; a 100 keV X-ray photon carries 16.02 fJ. A single myosin II motor protein power stroke dissipates ~5-40 fJ. ATP hydrolysis under cellular conditions yields ~80-100 fJ of free energy. Advanced 3 nm CMOS gates switch at ~0.1-1 fJ per operation. Ultrafast fiber laser oscillators produce pulses of 0.1-10 fJ before amplification. 1 fJ = 10⁻¹⁵ J = 6.242 keV.
Quick Reference Table
| Megatons of TNT (Mt(TNT)) | Femtojoules (fJ) |
|---|---|
| 1 Mt(TNT) | 4.184 × 1030 fJ |
| 2 Mt(TNT) | 8.368 × 1030 fJ |
| 5 Mt(TNT) | 2.092 × 1031 fJ |
| 10 Mt(TNT) | 4.184 × 1031 fJ |
| 25 Mt(TNT) | 1.046 × 1032 fJ |
| 50 Mt(TNT) | 2.092 × 1032 fJ |
| 100 Mt(TNT) | 4.184 × 1032 fJ |