Convert BTU inch per hour per square foot per degree Fahrenheit to BTU per second per foot per degree Fahrenheit
Convert BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) to BTU per second per foot per degree Fahrenheit (BTU/(s·ft·°F)) instantly and accurately.
Conversion Formula
BTU/(s·ft·°F) = BTU·in/(h·ft²·°F) × 2.314814815e-5
About BTU inch per hour per square foot per degree Fahrenheit
The BTU·in/(h·ft²·°F) equals (1055.05585262 × 0.0254 × 9)/(3600 × 0.09290304 × 5) W/(m·K) ≈0.1442 W/(m·K). The standard US k-factor unit for insulation per ASTM C177, C335, and C518. Mineral wool ≈0.25; expanded polystyrene ≈0.24; polyurethane foam ≈0.14 BTU·in/(h·ft²·°F). 1 BTU·in/(h·ft²·°F) ≈0.1442 W/(m·K).
About BTU per second per foot per degree Fahrenheit
The BTU per second per foot per degree Fahrenheit (BTU/(s·ft·°F)) equals (1055.05585262 × 9)/(0.3048 × 5) W/(m·K) ≈6230.6 W/(m·K). Equal to 3600 × BTU/(h·ft·°F). Reserved for extremely high-power transient applications in US engineering literature; copper ≈0.0617; carbon steel ≈0.0072 BTU/(s·ft·°F). 1 BTU/(s·ft·°F) = 3600 BTU/(h·ft·°F) ≈6230.6 W/(m·K).
Quick Reference Table
| BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) | BTU per second per foot per degree Fahrenheit (BTU/(s·ft·°F)) |
|---|---|
| 1 BTU·in/(h·ft²·°F) | 2.315 × 10-5 BTU/(s·ft·°F) |
| 2 BTU·in/(h·ft²·°F) | 4.63 × 10-5 BTU/(s·ft·°F) |
| 5 BTU·in/(h·ft²·°F) | 0.000115741 BTU/(s·ft·°F) |
| 10 BTU·in/(h·ft²·°F) | 0.000231481 BTU/(s·ft·°F) |
| 25 BTU·in/(h·ft²·°F) | 0.000578704 BTU/(s·ft·°F) |
| 50 BTU·in/(h·ft²·°F) | 0.00115741 BTU/(s·ft·°F) |
| 100 BTU·in/(h·ft²·°F) | 0.00231481 BTU/(s·ft·°F) |