Convert BTU per hour per foot per degree Fahrenheit to Watt per metre degree Celsius
Convert BTU per hour per foot per degree Fahrenheit (BTU/(h·ft·°F)) to Watt per metre degree Celsius (W/(m·°C)) instantly and accurately.
Conversion Formula
W/(m·°C) = BTU/(h·ft·°F) × 1.730734666
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 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 per hour per foot per degree Fahrenheit (BTU/(h·ft·°F)) | Watt per metre degree Celsius (W/(m·°C)) |
|---|---|
| 1 BTU/(h·ft·°F) | 1.73073 W/(m·°C) |
| 2 BTU/(h·ft·°F) | 3.46147 W/(m·°C) |
| 5 BTU/(h·ft·°F) | 8.65367 W/(m·°C) |
| 10 BTU/(h·ft·°F) | 17.3073 W/(m·°C) |
| 25 BTU/(h·ft·°F) | 43.2684 W/(m·°C) |
| 50 BTU/(h·ft·°F) | 86.5367 W/(m·°C) |
| 100 BTU/(h·ft·°F) | 173.073 W/(m·°C) |