Convert Foot-Pounds per Second to BTU per Hour
Convert Foot-Pounds per Second (ft⋅lbf/s) to BTU per Hour (BTU/h) instantly and accurately.
Conversion Formula
BTU/h = ft⋅lbf/s × 4.626242868
About Foot-Pounds per Second
One foot-pound per second (ft·lbf/s) ≈ 1.3558 W - the natural power unit in the foot-pound-second (FPS) system. Since 1 mechanical horsepower = exactly 550 ft·lbf/s, the conversion 1 ft·lbf/s = 1/550 hp is exact. Used in FPS structural and fluid dynamics: beam deflection power, pump and turbine output, and ballistic energy-transfer calculations. 19th-century American industry rated waterwheel output in ft·lbf/s before horsepower standardisation. 1 ft·lbf/s = 1.35582 W.
About BTU per Hour
One BTU per hour (BTU/h) ≈ 0.2931 W - the dominant HVAC capacity unit in the US and Canada. Room air conditioners are universally rated in BTU/h: 12,000 BTU/h = 1 ton of refrigeration = 3,517 W. Home furnaces range from 40,000-150,000 BTU/h. Office building cooling demand is calculated in BTU/h per ft². Engineers convert: BTU/h × 0.2931 = W; or W × 3.412 = BTU/h. 1 BTU/h = 0.29307 W.
Quick Reference Table
| Foot-Pounds per Second (ft⋅lbf/s) | BTU per Hour (BTU/h) |
|---|---|
| 1 ft⋅lbf/s | 4.62624 BTU/h |
| 2 ft⋅lbf/s | 9.25249 BTU/h |
| 5 ft⋅lbf/s | 23.1312 BTU/h |
| 10 ft⋅lbf/s | 46.2624 BTU/h |
| 25 ft⋅lbf/s | 115.656 BTU/h |
| 50 ft⋅lbf/s | 231.312 BTU/h |
| 100 ft⋅lbf/s | 462.624 BTU/h |