Convert BTU per second per foot per degree Fahrenheit to BTU inch per hour per square foot per degree Fahrenheit
Convert BTU per second per foot per degree Fahrenheit (BTU/(s·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/(s·ft·°F) × 43200
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).
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 second per foot per degree Fahrenheit (BTU/(s·ft·°F)) | BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) |
|---|---|
| 1 BTU/(s·ft·°F) | 43200 BTU·in/(h·ft²·°F) |
| 2 BTU/(s·ft·°F) | 86400 BTU·in/(h·ft²·°F) |
| 5 BTU/(s·ft·°F) | 216000 BTU·in/(h·ft²·°F) |
| 10 BTU/(s·ft·°F) | 432000 BTU·in/(h·ft²·°F) |
| 25 BTU/(s·ft·°F) | 1080000 BTU·in/(h·ft²·°F) |
| 50 BTU/(s·ft·°F) | 2160000 BTU·in/(h·ft²·°F) |
| 100 BTU/(s·ft·°F) | 4320000 BTU·in/(h·ft²·°F) |