Convert Milliwatt per metre degree Celsius to BTU inch per hour per square foot per degree Fahrenheit
Convert Milliwatt per metre degree Celsius (mW/(m·°C)) to BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) instantly and accurately.
Conversion Formula
BTU·in/(h·ft²·°F) = mW/(m·°C) × 0.006933471799
About Milliwatt per metre degree Celsius
The milliwatt per metre degree Celsius (mW/(m·°C)) equals exactly 1 mW/(m·K) = 10⁻³ W/(m·K) since temperature intervals 1 °C = 1 K. Used interchangeably with mW/(m·K) in building physics, insulation standards (EN ISO 10456), and material datasheets where Celsius is the preferred temperature scale. Still air ≈26 mW/(m·°C); mineral wool ≈35 mW/(m·°C). 1 mW/(m·°C) = 1 mW/(m·K) = 10⁻³ W/(m·K).
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).
Quick Reference Table
| Milliwatt per metre degree Celsius (mW/(m·°C)) | BTU inch per hour per square foot per degree Fahrenheit (BTU·in/(h·ft²·°F)) |
|---|---|
| 1 mW/(m·°C) | 0.00693347 BTU·in/(h·ft²·°F) |
| 2 mW/(m·°C) | 0.0138669 BTU·in/(h·ft²·°F) |
| 5 mW/(m·°C) | 0.0346674 BTU·in/(h·ft²·°F) |
| 10 mW/(m·°C) | 0.0693347 BTU·in/(h·ft²·°F) |
| 25 mW/(m·°C) | 0.173337 BTU·in/(h·ft²·°F) |
| 50 mW/(m·°C) | 0.346674 BTU·in/(h·ft²·°F) |
| 100 mW/(m·°C) | 0.693347 BTU·in/(h·ft²·°F) |