Convert Exajoules to Horsepower-Hours
Convert Exajoules (EJ) to Horsepower-Hours (hp·h) instantly and accurately.
Conversion Formula
hp·h = EJ × 372506136000
About Exajoules
An exajoule (EJ) is 10¹⁸ J - the scale of global energy consumption. World primary energy supply in 2022 was ~580-610 EJ: coal ~160 EJ; oil ~190 EJ; gas ~145 EJ; nuclear ~26 EJ; wind ~8 EJ; solar PV ~8 EJ. Global electricity generation of ~29,000 TWh = 104 EJ. Solar energy incident on Earth's atmosphere is ~5.5 × 10⁶ EJ/year - approximately 9,000× total human demand. Annual fossil fuel combustion releases ~490 EJ/year, producing ~36.8 Gt CO₂. 1 EJ = 10¹⁸ J = 277.78 TWh = 238.85 Mtoe.
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
| Exajoules (EJ) | Horsepower-Hours (hp·h) |
|---|---|
| 1 EJ | 3.725 × 1011 hp·h |
| 2 EJ | 7.45 × 1011 hp·h |
| 5 EJ | 1.863 × 1012 hp·h |
| 10 EJ | 3.725 × 1012 hp·h |
| 25 EJ | 9.313 × 1012 hp·h |
| 50 EJ | 1.863 × 1013 hp·h |
| 100 EJ | 3.725 × 1013 hp·h |