Convert BTU inch per hour per square foot per degree Fahrenheit to Kilowatt per metre kelvin
Convert BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) to Kilowatt per metre kelvin (kW/(m·K)) instantly and accurately.
Conversion Formula
kW/(m·K) = BTU·in/(h·ft²·°F) × 0.0001442278889
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 Kilowatt per metre kelvin
The kilowatt per metre kelvin (kW/(m·K)) equals exactly 1000 W/(m·K). Used for exceptionally conductive materials: type IIa diamond ≈2.2 kW/(m·K), isotopically pure ²⁸Si ≈1.0 kW/(m·K), single-crystal graphene > 5 kW/(m·K) at room temperature. Convenient for comparing advanced thermal management and heat spreader materials. 1 kW/(m·K) = 1000 W/(m·K).
Quick Reference Table
| BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) | Kilowatt per metre kelvin (kW/(m·K)) |
|---|---|
| 1 BTU·in/(h·ft²·°F) | 0.000144228 kW/(m·K) |
| 2 BTU·in/(h·ft²·°F) | 0.000288456 kW/(m·K) |
| 5 BTU·in/(h·ft²·°F) | 0.000721139 kW/(m·K) |
| 10 BTU·in/(h·ft²·°F) | 0.00144228 kW/(m·K) |
| 25 BTU·in/(h·ft²·°F) | 0.0036057 kW/(m·K) |
| 50 BTU·in/(h·ft²·°F) | 0.00721139 kW/(m·K) |
| 100 BTU·in/(h·ft²·°F) | 0.0144228 kW/(m·K) |