Convert Square feet per hour to Square feet per second
Convert Square feet per hour (ft²/h) to Square feet per second (ft²/s) instantly and accurately.
Conversion Formula
ft²/s = ft²/h × 0.0002777777778
About Square feet per hour
The square foot per hour (ft²/h) equals 0.3048²/3600 ≈ 2.581 × 10⁻⁵ m²/s. It is the standard US unit for thermal diffusivity in the BTU-ft-h system, used alongside heat-transfer and mass-transfer calculations. Air at 20 °C ≈ 0.573 ft²/h; water at 20 °C ≈ 0.0096 ft²/h. 1 ft²/h ≈ 25.81 cSt.
About Square feet per second
The square foot per second (ft²/s) equals 0.3048² = 0.09290304 m²/s. It is the coherent FPS kinematic viscosity unit, used in US aerospace, hydraulic machinery, and civil/coastal engineering. Water at 20 °C ≈ 1.082 × 10⁻⁵ ft²/s; air at 20 °C ≈ 1.632 × 10⁻⁴ ft²/s. 1 ft²/s ≈ 92903 cSt.
Quick Reference Table
| Square feet per hour (ft²/h) | Square feet per second (ft²/s) |
|---|---|
| 1 ft²/h | 0.000277778 ft²/s |
| 2 ft²/h | 0.000555556 ft²/s |
| 5 ft²/h | 0.00138889 ft²/s |
| 10 ft²/h | 0.00277778 ft²/s |
| 25 ft²/h | 0.00694444 ft²/s |
| 50 ft²/h | 0.0138889 ft²/s |
| 100 ft²/h | 0.0277778 ft²/s |