Convert Watts to Calories per Hour
Convert Watts (W) to Calories per Hour (cal/h) instantly and accurately.
Conversion Formula
cal/h = W × 859.8452279
About Watts
The watt (W) is the SI unit of power - 1 J/s - named after James Watt (1736-1819). Familiar power levels: smartphone charging 5-65 W; laptop 15-100 W; microwave 700-1,200 W; electric kettle 2,000-3,000 W; human resting metabolism ~80 W; peak sprint ~2,000 W. The now-obsolete 100 W incandescent bulb is replaced by a 10-15 W LED producing the same light. In AC circuits, reactive power uses the var and apparent power the VA, both derived from watts. 1 W = 1 J/s = 1 kg·m²/s³.
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
| Watts (W) | Calories per Hour (cal/h) |
|---|---|
| 1 W | 859.845 cal/h |
| 2 W | 1719.69 cal/h |
| 5 W | 4299.23 cal/h |
| 10 W | 8598.45 cal/h |
| 25 W | 21496.1 cal/h |
| 50 W | 42992.3 cal/h |
| 100 W | 85984.5 cal/h |