Convert Mechanical Horsepower to Calories per Hour
Convert Mechanical Horsepower (hp) to Calories per Hour (cal/h) instantly and accurately.
Conversion Formula
cal/h = hp × 641186.476
About Mechanical Horsepower
The mechanical horsepower (hp) is exactly 550 ft·lbf/s ≈ 745.7 W - defined by James Watt by timing mine horses to set a comparable steam engine rating. A typical compact car produces 100-150 hp (75-112 kW); a sports car 300-600 hp; an F1 car ~1,000 hp (745 kW). SAE net horsepower is measured at the flywheel with all accessories fitted. Marine diesel engines, aircraft piston engines, and lawn equipment are still rated in hp. 1 hp = 550 ft·lbf/s = 745.6998715822704 W.
About Calories per Hour
One calorie per hour (cal/h) equals exactly 0.001163 W - the rate of transferring one thermochemical calorie (4.1868 J) per hour. A resting adult generates ~70-80 W ≈ 60,000-70,000 cal/h of heat. The unit appears in European and Asian HVAC standards for small-appliance heat loads and in laboratory calorimetry reporting metabolic activity of small organisms. Calorimetric enzyme assays also express catalytic heat in cal/h per unit enzyme. 1 cal/h = 0.001163 W.
Quick Reference Table
| Mechanical Horsepower (hp) | Calories per Hour (cal/h) |
|---|---|
| 1 hp | 641186 cal/h |
| 2 hp | 1282370 cal/h |
| 5 hp | 3205930 cal/h |
| 10 hp | 6411860 cal/h |
| 25 hp | 16029700 cal/h |
| 50 hp | 32059300 cal/h |
| 100 hp | 64118600 cal/h |