Convert BTU inch per hour per square foot per degree Fahrenheit to Milliwatt per metre kelvin
Convert BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) to Milliwatt per metre kelvin (mW/(m·K)) instantly and accurately.
Conversion Formula
mW/(m·K) = BTU·in/(h·ft²·°F) × 144.2278889
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 Milliwatt per metre kelvin
The milliwatt per metre kelvin (mW/(m·K)) equals exactly 10⁻³ W/(m·K). Used for gases and ultra-low thermal conductivity solids: still air ≈26 mW/(m·K), CO₂ ≈16 mW/(m·K), aerogels 12-20 mW/(m·K), vacuum insulation panels ≈5 mW/(m·K). Standard insulation products are typically specified in mW/(m·K). 1 mW/(m·K) = 10⁻³ W/(m·K) = 0.1 mW/(cm·K).
Quick Reference Table
| BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) | Milliwatt per metre kelvin (mW/(m·K)) |
|---|---|
| 1 BTU·in/(h·ft²·°F) | 144.228 mW/(m·K) |
| 2 BTU·in/(h·ft²·°F) | 288.456 mW/(m·K) |
| 5 BTU·in/(h·ft²·°F) | 721.139 mW/(m·K) |
| 10 BTU·in/(h·ft²·°F) | 1442.28 mW/(m·K) |
| 25 BTU·in/(h·ft²·°F) | 3605.7 mW/(m·K) |
| 50 BTU·in/(h·ft²·°F) | 7211.39 mW/(m·K) |
| 100 BTU·in/(h·ft²·°F) | 14422.8 mW/(m·K) |