Convert BTU per Second to Kilocalories per Hour
Convert BTU per Second (BTU/s) to Kilocalories per Hour (kcal/h) instantly and accurately.
Conversion Formula
kcal/h = BTU/s × 907.18474
About BTU per Second
One BTU per second (BTU/s) ≈ 1,055 W - close to 1 kW but slightly larger. Used when heat rates are so high that per-hour or per-minute numbers become unwieldy. In fire protection engineering, large house fires peak at 500-2,000 BTU/s; industrial fires at millions of BTU/s. Blast characterisation for petrochemical safety and large industrial heat exchangers with duties of millions of BTU/h are conveniently expressed in BTU/s. Since 1 BTU/s ≈ 1.055 kW, conversion to SI is straightforward. 1 BTU/s = 1,055.056 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
| BTU per Second (BTU/s) | Kilocalories per Hour (kcal/h) |
|---|---|
| 1 BTU/s | 907.185 kcal/h |
| 2 BTU/s | 1814.37 kcal/h |
| 5 BTU/s | 4535.92 kcal/h |
| 10 BTU/s | 9071.85 kcal/h |
| 25 BTU/s | 22679.6 kcal/h |
| 50 BTU/s | 45359.2 kcal/h |
| 100 BTU/s | 90718.5 kcal/h |