Convert Horsepower-Hours to Kilotons of TNT
Convert Horsepower-Hours (hp·h) to Kilotons of TNT (kt(TNT)) instantly and accurately.
Conversion Formula
kt(TNT) = hp·h × 6.416155683e-7
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.
About Kilotons of TNT
A kiloton of TNT (kt(TNT)) = 10³ tons of TNT = exactly 4.184 TJ. It is the standard unit for sub-megaton nuclear weapon yields. Hiroshima's Little Boy: ~12-18 kt; Nagasaki's Fat Man: ~19-23 kt. The W88 warhead (Trident II) is ~475 kt; the W76 is ~100 kt. The Beirut port explosion (2020): estimated 0.5-1.1 kt. A magnitude 5.0 earthquake releases ~0.5-2 kt of seismic energy. A kiloton blast creates a fireball ~90-100 m radius and a lethal thermal radius of ~1-2 km. 1 kt(TNT) = 4.184 TJ = 1,162.8 MWh.
Quick Reference Table
| Horsepower-Hours (hp·h) | Kilotons of TNT (kt(TNT)) |
|---|---|
| 1 hp·h | 6.416 × 10-7 kt(TNT) |
| 2 hp·h | 1.283 × 10-6 kt(TNT) |
| 5 hp·h | 3.208 × 10-6 kt(TNT) |
| 10 hp·h | 6.416 × 10-6 kt(TNT) |
| 25 hp·h | 1.604 × 10-5 kt(TNT) |
| 50 hp·h | 3.208 × 10-5 kt(TNT) |
| 100 hp·h | 6.416 × 10-5 kt(TNT) |