Convert Square feet per hour to Square inches per second
Convert Square feet per hour (ft²/h) to Square inches per second (in²/s) instantly and accurately.
Conversion Formula
in²/s = ft²/h × 0.04
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 inches per second
The square inch per second (in²/s) equals 0.0254² = 6.4516 × 10⁻⁴ m²/s. It is the coherent FPS kinematic unit based on the inch, found in US fluid power, hydraulics, and bearing-design references. 1 in²/s = 645.16 cSt = 6.4516 St.
Quick Reference Table
| Square feet per hour (ft²/h) | Square inches per second (in²/s) |
|---|---|
| 1 ft²/h | 0.04 in²/s |
| 2 ft²/h | 0.08 in²/s |
| 5 ft²/h | 0.2 in²/s |
| 10 ft²/h | 0.4 in²/s |
| 25 ft²/h | 1 in²/s |
| 50 ft²/h | 2 in²/s |
| 100 ft²/h | 4 in²/s |