Convert Mechanical Horsepower to Kilocalories per Hour
Convert Mechanical Horsepower (hp) to Kilocalories per Hour (kcal/h) instantly and accurately.
Conversion Formula
kcal/h = hp × 641.186476
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 Kilocalories per Hour
One kilocalorie per hour (kcal/h) equals exactly 1.163 W. It is the natural unit for human metabolic rate: sedentary adult ~60-70 kcal/h; walking 250-350 kcal/h; vigorous cycling 500-700 kcal/h; competitive rowing ~1,200 kcal/h. Treadmills and exercise bikes display kcal/h directly. Industrial drying and evaporation calcs in older metric systems (especially Asia) used kcal/h for heat duty; 1 Mcal/h = 1.163 kW. 1 kcal/h = 1.163 W.
Quick Reference Table
| Mechanical Horsepower (hp) | Kilocalories per Hour (kcal/h) |
|---|---|
| 1 hp | 641.186 kcal/h |
| 2 hp | 1282.37 kcal/h |
| 5 hp | 3205.93 kcal/h |
| 10 hp | 6411.86 kcal/h |
| 25 hp | 16029.7 kcal/h |
| 50 hp | 32059.3 kcal/h |
| 100 hp | 64118.6 kcal/h |