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U-factor (W/m²·K) to U-factor (BTU/h·ft²·°F)

Convert U-factor (W/m²·K) to U-factor (BTU/h·ft²·°F), with the math shown step by step.

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BTU per hour-square foot-degree Fahrenheit
3.52 BTU/(h·ft²·°F)

20 W/(m²·K) = 3.52 BTU/(h·ft²·°F)

Also equals

How it works

BTU/(h·ft²·°F) = W/(m²·K) ÷ 5.67826334

One BTU per hour-square foot-degree Fahrenheit is about 5.67826334 watts per square meter-kelvin, so dividing by 5.67826334 turns watts per square meter-kelvin into BTU per hour-square foot-degree Fahrenheit. For example, 1.4 W/(m²·K) is about 0.2466 BTU/(h·ft²·°F).

  1. Divide by 5.67826334 20 ÷ 5.67826334 = 3.52 BTU/(h·ft²·°F)

Nearby values

Watts per square meter-kelvin BTU per hour-square foot-degree Fahrenheit R-value (US) Kilocalories per hour-square meter-degree Celsius
19.7 W/(m²·K) 3.47 BTU/(h·ft²·°F) 0.29 16.95
19.8 W/(m²·K) 3.49 BTU/(h·ft²·°F) 0.29 17.04
19.9 W/(m²·K) 3.5 BTU/(h·ft²·°F) 0.29 17.12
20 W/(m²·K) 3.52 BTU/(h·ft²·°F) 0.28 17.21
20.1 W/(m²·K) 3.54 BTU/(h·ft²·°F) 0.28 17.29
20.2 W/(m²·K) 3.56 BTU/(h·ft²·°F) 0.28 17.38
20.3 W/(m²·K) 3.58 BTU/(h·ft²·°F) 0.28 17.47

Printed from rocketcalc.io/heat-transfer/metric-u-value-to-us-u-factor/20