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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
3.48 BTU/(h·ft²·°F)

19.77 W/(m²·K) = 3.48 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 19.77 ÷ 5.67826334 = 3.48 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
19.47 W/(m²·K) 3.43 BTU/(h·ft²·°F) 0.29 16.75
19.57 W/(m²·K) 3.45 BTU/(h·ft²·°F) 0.29 16.84
19.67 W/(m²·K) 3.46 BTU/(h·ft²·°F) 0.29 16.92
19.77 W/(m²·K) 3.48 BTU/(h·ft²·°F) 0.29 17.01
19.87 W/(m²·K) 3.5 BTU/(h·ft²·°F) 0.29 17.1
19.97 W/(m²·K) 3.52 BTU/(h·ft²·°F) 0.28 17.18
20.07 W/(m²·K) 3.53 BTU/(h·ft²·°F) 0.28 17.27

Printed from rocketcalc.io/heat-transfer/metric-u-value-to-us-u-factor/19.77