I need to convert a thermal conduction unit W/m.K to Btu/ft.h.°F. I have 400 W/m.K and I need to find this value in Btu/ft.h.°F. I know that 1W=3.41214 Btu/h, 1m=3.2808ft and 1K=-457,87°F.I replaced all the values in the equation and got to -0.9085 Btu/ft.h.°F. But these values are incorrect according to internet queries and also in the book, could someone tell me what I'm missing?


The kelvin is a unit of temperature change (interval) in the thermal conductivity equation.

So you need to find what a temperature change in degree fahrenheit corresponds to a temperature change of one kelvin.

  • $\begingroup$ I understood, so for 1 unit change in K I have 1.8 unit changes in F. Thank you. $\endgroup$ – Eduardo Cardoso Apr 8 '18 at 17:54
  • $\begingroup$ @EduardoCardoso You can always check your conversion by using one of the many online unit converters. $\endgroup$ – Farcher Apr 8 '18 at 18:00

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