Convert Horsepower-Hours to Kilowatt-Hours
Convert Horsepower-Hours (hp·h) to Kilowatt-Hours (kWh) instantly and accurately.
Conversion Formula
kWh = hp·h × 0.7456998716
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 Kilowatt-Hours
A kilowatt-hour (kWh) is the energy consumed by 1 kW for one hour - exactly 3,600,000 J = 3.6 MJ. All domestic electricity meters bill in kWh. Appliance benchmarks: fridge 180-250 kWh/year; washing machine 0.5-2.0 kWh/cycle; air conditioner 1-3 kWh/h. EVs consume 13-25 kWh/100 km; the Lucid Air achieves ~15.9 kWh/100 km (WLTP). Producing 1 tonne of primary aluminium requires ~13,000-15,000 kWh. Global electricity generation is ~29,165 TWh ≈ 2.9 × 10¹³ kWh/year. 1 kWh = 3.6 MJ = 3,412.1 BTU = 859.85 kcal.
Quick Reference Table
| Horsepower-Hours (hp·h) | Kilowatt-Hours (kWh) |
|---|---|
| 1 hp·h | 0.7457 kWh |
| 2 hp·h | 1.4914 kWh |
| 5 hp·h | 3.7285 kWh |
| 10 hp·h | 7.457 kWh |
| 25 hp·h | 18.6425 kWh |
| 50 hp·h | 37.285 kWh |
| 100 hp·h | 74.57 kWh |