Convert BTU inch per hour per square foot per degree Fahrenheit to BTU per hour per foot per degree Fahrenheit
Convert BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) to BTU per hour per foot per degree Fahrenheit (BTU/(h·ft·°F)) instantly and accurately.
Conversion Formula
BTU/(h·ft·°F) = BTU·in/(h·ft²·°F) × 0.08333333333
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 hour per foot per degree Fahrenheit
The BTU/(h·ft·°F) equals (1055.05585262 × 9)/(3600 × 0.3048 × 5) W/(m·K) ≈1.7307 W/(m·K). Standard US thermal conductivity unit in ASHRAE Handbook and ASTM C1045. Copper: ≈223; carbon steel: ≈26; brick: ≈0.44; glass fibre insulation: ≈0.025 BTU/(h·ft·°F). 1 BTU/(h·ft·°F) = 12 BTU·in/(h·ft²·°F) ≈1.7307 W/(m·K).
Quick Reference Table
| BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) | BTU per hour per foot per degree Fahrenheit (BTU/(h·ft·°F)) |
|---|---|
| 1 BTU·in/(h·ft²·°F) | 0.0833333 BTU/(h·ft·°F) |
| 2 BTU·in/(h·ft²·°F) | 0.166667 BTU/(h·ft·°F) |
| 5 BTU·in/(h·ft²·°F) | 0.416667 BTU/(h·ft·°F) |
| 10 BTU·in/(h·ft²·°F) | 0.833333 BTU/(h·ft·°F) |
| 25 BTU·in/(h·ft²·°F) | 2.08333 BTU/(h·ft·°F) |
| 50 BTU·in/(h·ft²·°F) | 4.16667 BTU/(h·ft·°F) |
| 100 BTU·in/(h·ft²·°F) | 8.33333 BTU/(h·ft·°F) |