Convert BTU per hour per foot per degree Fahrenheit to Watt per metre kelvin
Convert BTU per hour per foot per degree Fahrenheit (BTU/(h·ft·°F)) to Watt per metre kelvin (W/(m·K)) instantly and accurately.
Conversion Formula
W/(m·K) = 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 kelvin
The watt per metre kelvin (W/(m·K)) is the SI unit for thermal conductivity defined by Fourier's law q = -λ∇T. Materials span orders of magnitude: aerogels ≈0.015, glass ≈1.0, stainless steel ≈16, aluminium ≈205, copper ≈385, diamond ≈2200 W/(m·K). Referenced in ISO 22007, EN 12667, and all major international standards. 1 W/(m·K) = 1 W/(m·°C).
Quick Reference Table
| BTU per hour per foot per degree Fahrenheit (BTU/(h·ft·°F)) | Watt per metre kelvin (W/(m·K)) |
|---|---|
| 1 BTU/(h·ft·°F) | 1.73073 W/(m·K) |
| 2 BTU/(h·ft·°F) | 3.46147 W/(m·K) |
| 5 BTU/(h·ft·°F) | 8.65367 W/(m·K) |
| 10 BTU/(h·ft·°F) | 17.3073 W/(m·K) |
| 25 BTU/(h·ft·°F) | 43.2684 W/(m·K) |
| 50 BTU/(h·ft·°F) | 86.5367 W/(m·K) |
| 100 BTU/(h·ft·°F) | 173.073 W/(m·K) |