Convert Watts to Foot-Pounds per Second
Convert Watts (W) to Foot-Pounds per Second (ft⋅lbf/s) instantly and accurately.
Conversion Formula
ft⋅lbf/s = W × 0.7375621493
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 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.
Quick Reference Table
| Watts (W) | Foot-Pounds per Second (ft⋅lbf/s) |
|---|---|
| 1 W | 0.737562 ft⋅lbf/s |
| 2 W | 1.47512 ft⋅lbf/s |
| 5 W | 3.68781 ft⋅lbf/s |
| 10 W | 7.37562 ft⋅lbf/s |
| 25 W | 18.4391 ft⋅lbf/s |
| 50 W | 36.8781 ft⋅lbf/s |
| 100 W | 73.7562 ft⋅lbf/s |