Convert Foot-Pound-Force to Horsepower-Hours
Convert Foot-Pound-Force (ft·lbf) to Horsepower-Hours (hp·h) instantly and accurately.
Conversion Formula
hp·h = ft·lbf × 5.050505051e-7
About Foot-Pound-Force
A foot-pound-force (ft·lbf) is the work done by one pound-force through one foot - exactly 1.3558179483314004 J. It is the standard torque and energy unit in US engineering. Automotive engine torque: Honda Civic ~125 lb-ft; Ford F-150 EcoBoost ~500 lb-ft. Muzzle energies: .22 LR ~140 ft·lbf; .308 Winchester ~2,600 ft·lbf; .50 BMG ~14,000 ft·lbf. Diesel pile hammers deliver 15,000-600,000 ft·lbf/blow. SAE Grade 8 bolts are specified at 7-950 ft·lbf. 1 ft·lbf = 12 in·lbf = 1.35582 J = 0.32405 cal.
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
| Foot-Pound-Force (ft·lbf) | Horsepower-Hours (hp·h) |
|---|---|
| 1 ft·lbf | 5.051 × 10-7 hp·h |
| 2 ft·lbf | 1.01 × 10-6 hp·h |
| 5 ft·lbf | 2.525 × 10-6 hp·h |
| 10 ft·lbf | 5.051 × 10-6 hp·h |
| 25 ft·lbf | 1.263 × 10-5 hp·h |
| 50 ft·lbf | 2.525 × 10-5 hp·h |
| 100 ft·lbf | 5.051 × 10-5 hp·h |