Convert BTU inch per hour per square foot per degree Fahrenheit to Watt per metre degree Celsius
Convert BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) to Watt per metre degree Celsius (W/(m·°C)) instantly and accurately.
Conversion Formula
W/(m·°C) = BTU·in/(h·ft²·°F) × 0.1442278889
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 Watt per metre degree Celsius
The watt per metre degree Celsius (W/(m·°C)) equals exactly 1 W/(m·K) since temperature intervals 1 °C = 1 K. Widely used in building physics (EN ISO 6946), HVAC engineering, and European material datasheets as an equivalent notation. Stone: ≈2.5 W/(m·°C); softwood timber: ≈0.14 W/(m·°C); glass wool: ≈0.04 W/(m·°C). 1 W/(m·°C) = 1 W/(m·K).
Quick Reference Table
| BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) | Watt per metre degree Celsius (W/(m·°C)) |
|---|---|
| 1 BTU·in/(h·ft²·°F) | 0.144228 W/(m·°C) |
| 2 BTU·in/(h·ft²·°F) | 0.288456 W/(m·°C) |
| 5 BTU·in/(h·ft²·°F) | 0.721139 W/(m·°C) |
| 10 BTU·in/(h·ft²·°F) | 1.44228 W/(m·°C) |
| 25 BTU·in/(h·ft²·°F) | 3.6057 W/(m·°C) |
| 50 BTU·in/(h·ft²·°F) | 7.21139 W/(m·°C) |
| 100 BTU·in/(h·ft²·°F) | 14.4228 W/(m·°C) |