Convert Calories per Hour to Electrical Horsepower
Convert Calories per Hour (cal/h) to Electrical Horsepower (hp(E)) instantly and accurately.
Conversion Formula
hp(E) = cal/h × 1.558981233e-6
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.
About Electrical Horsepower
The electrical horsepower (hp(E)) is defined as exactly 746 W - the US NEMA rounding used on electric motor nameplates. It differs from mechanical hp (745.7 W) by only 0.04%. Every NEMA-rated motor in the US carries a horsepower nameplate: a '5 hp motor' delivers 5 × 746 = 3,730 W. NEC motor branch-circuit sizing tables, overload relay selection, and starter ratings are all based on hp(E). Despite global kW adoption, US industrial motor infrastructure remains standardised in electrical horsepower. 1 hp(E) = 746 W.
Quick Reference Table
| Calories per Hour (cal/h) | Electrical Horsepower (hp(E)) |
|---|---|
| 1 cal/h | 1.559 × 10-6 hp(E) |
| 2 cal/h | 3.118 × 10-6 hp(E) |
| 5 cal/h | 7.795 × 10-6 hp(E) |
| 10 cal/h | 1.559 × 10-5 hp(E) |
| 25 cal/h | 3.897 × 10-5 hp(E) |
| 50 cal/h | 7.795 × 10-5 hp(E) |
| 100 cal/h | 0.000155898 hp(E) |