Convert Femtojoules to Megatons of TNT
Convert Femtojoules (fJ) to Megatons of TNT (Mt(TNT)) instantly and accurately.
Conversion Formula
Mt(TNT) = fJ × 2.390057361e-31
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.
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
| Femtojoules (fJ) | Megatons of TNT (Mt(TNT)) |
|---|---|
| 1 fJ | 2.39 × 10-31 Mt(TNT) |
| 2 fJ | 4.78 × 10-31 Mt(TNT) |
| 5 fJ | 1.195 × 10-30 Mt(TNT) |
| 10 fJ | 2.39 × 10-30 Mt(TNT) |
| 25 fJ | 5.975 × 10-30 Mt(TNT) |
| 50 fJ | 1.195 × 10-29 Mt(TNT) |
| 100 fJ | 2.39 × 10-29 Mt(TNT) |