Convert Watt per metre kelvin to BTU per hour per foot per degree Fahrenheit
Convert Watt per metre kelvin (W/(m·K)) to BTU per hour per foot per degree Fahrenheit (BTU/(h·ft·°F)) instantly and accurately.
Conversion Formula
BTU/(h·ft·°F) = W/(m·K) × 0.5777893165
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).
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).
Quick Reference Table
| Watt per metre kelvin (W/(m·K)) | BTU per hour per foot per degree Fahrenheit (BTU/(h·ft·°F)) |
|---|---|
| 1 W/(m·K) | 0.577789 BTU/(h·ft·°F) |
| 2 W/(m·K) | 1.15558 BTU/(h·ft·°F) |
| 5 W/(m·K) | 2.88895 BTU/(h·ft·°F) |
| 10 W/(m·K) | 5.77789 BTU/(h·ft·°F) |
| 25 W/(m·K) | 14.4447 BTU/(h·ft·°F) |
| 50 W/(m·K) | 28.8895 BTU/(h·ft·°F) |
| 100 W/(m·K) | 57.7789 BTU/(h·ft·°F) |