Convert Milliwatt per metre degree Celsius to BTU per hour per foot per degree Fahrenheit

Convert Milliwatt per metre degree Celsius (mW/(m·°C)) to BTU per hour per foot per degree Fahrenheit (BTU/(h·ft·°F)) instantly and accurately.

From: Milliwatt per metre degree Celsius (mW/(m·°C))

To: BTU per hour per foot per degree Fahrenheit (BTU/(h·ft·°F))

Conversion Formula

BTU/(h·ft·°F) = mW/(m·°C) × 0.0005777893165

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 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

Milliwatt per metre degree Celsius (mW/(m·°C))	BTU per hour per foot per degree Fahrenheit (BTU/(h·ft·°F))
1 mW/(m·°C)	0.000577789 BTU/(h·ft·°F)
2 mW/(m·°C)	0.00115558 BTU/(h·ft·°F)
5 mW/(m·°C)	0.00288895 BTU/(h·ft·°F)
10 mW/(m·°C)	0.00577789 BTU/(h·ft·°F)
25 mW/(m·°C)	0.0144447 BTU/(h·ft·°F)
50 mW/(m·°C)	0.0288895 BTU/(h·ft·°F)
100 mW/(m·°C)	0.0577789 BTU/(h·ft·°F)

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