Convert Megatons of TNT to Horsepower-Hours
Convert Megatons of TNT (Mt(TNT)) to Horsepower-Hours (hp·h) instantly and accurately.
Conversion Formula
hp·h = Mt(TNT) × 1558565673
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 Horsepower-Hours
A horsepower-hour (hp·h) is the energy from one mechanical horsepower (745.6999 W) for one hour - exactly 2,684,519.54 J ≈ 2.685 MJ. James Watt coined the horsepower to compare his steam engines with mine horses; billing in hp·h preceded the kilowatt-hour tariff. The metric horsepower (PS = 75 kgf·m/s = 735.499 W) gives a slightly smaller metric-hp·h = 2,647,795 J, used in European and Japanese engine datasheets. Today the hp·h appears in marine engineering logs, mining energy accounting, and vintage industrial equipment. 1 hp·h = 2.6845 MJ = 0.74570 kWh = 641.19 kcal.
Quick Reference Table
| Megatons of TNT (Mt(TNT)) | Horsepower-Hours (hp·h) |
|---|---|
| 1 Mt(TNT) | 1.559 × 109 hp·h |
| 2 Mt(TNT) | 3.117 × 109 hp·h |
| 5 Mt(TNT) | 7.793 × 109 hp·h |
| 10 Mt(TNT) | 1.559 × 1010 hp·h |
| 25 Mt(TNT) | 3.896 × 1010 hp·h |
| 50 Mt(TNT) | 7.793 × 1010 hp·h |
| 100 Mt(TNT) | 1.559 × 1011 hp·h |