Convert BTU per hour per foot per degree Fahrenheit to BTU inch per hour per square foot per degree Fahrenheit
Convert BTU per hour per foot per degree Fahrenheit (BTU/(h·ft·°F)) to BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) instantly and accurately.
Conversion Formula
BTU·in/(h·ft²·°F) = BTU/(h·ft·°F) × 12
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).
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).
Quick Reference Table
| BTU per hour per foot per degree Fahrenheit (BTU/(h·ft·°F)) | BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) |
|---|---|
| 1 BTU/(h·ft·°F) | 12 BTU·in/(h·ft²·°F) |
| 2 BTU/(h·ft·°F) | 24 BTU·in/(h·ft²·°F) |
| 5 BTU/(h·ft·°F) | 60 BTU·in/(h·ft²·°F) |
| 10 BTU/(h·ft·°F) | 120 BTU·in/(h·ft²·°F) |
| 25 BTU/(h·ft·°F) | 300 BTU·in/(h·ft²·°F) |
| 50 BTU/(h·ft·°F) | 600 BTU·in/(h·ft²·°F) |
| 100 BTU/(h·ft·°F) | 1200 BTU·in/(h·ft²·°F) |