Convert Square inches per minute to Square feet per hour
Convert Square inches per minute (in²/min) to Square feet per hour (ft²/h) instantly and accurately.
Conversion Formula
ft²/h = in²/min × 0.4166666667
About Square inches per minute
The square inch per minute (in²/min) equals ≈1.075 × 10⁻⁵ m²/s, found in US military and aerospace specifications for thermal protection materials and ablative heat shields. Some NASA technical reports on reentry vehicle TPS (Thermal Protection System) materials quote diffusivity in in²/min. 1 in²/min = 0.00064516/60 m²/s.
About Square feet per hour
The square foot per hour (ft²/h) equals ≈2.581 × 10⁻⁵ m²/s and is the dominant unit in US engineering practice for thermal diffusivity of building materials and industrial insulation. ASHRAE handbooks, Perry's Chemical Engineers' Handbook, and NFPA fire-resistance tables all list diffusivity in ft²/h. Steel: ≈0.4-0.5 ft²/h; concrete: ≈0.023 ft²/h; mineral wool: ≈0.005 ft²/h. 1 ft²/h = 0.09290304/3600 m²/s.
Quick Reference Table
| Square inches per minute (in²/min) | Square feet per hour (ft²/h) |
|---|---|
| 1 in²/min | 0.416667 ft²/h |
| 2 in²/min | 0.833333 ft²/h |
| 5 in²/min | 2.08333 ft²/h |
| 10 in²/min | 4.16667 ft²/h |
| 25 in²/min | 10.4167 ft²/h |
| 50 in²/min | 20.8333 ft²/h |
| 100 in²/min | 41.6667 ft²/h |