Enter the temperature difference, the R-value, and the overall heat transfer coefficient into the Heat Flow Calculator. The calculator will evaluate the Heat Flow. 

Heat Flow Formula

The following formula is used to calculate the Heat Flow. 

HF = dT / R * HTC


  • HF is the Heat Flow ( )
  • dT is the temperature difference 
  • R is the R-value 
  • HTC is the overall heat transfer coefficient 

To calculate heat flow, divide the temperature difference by the R-value, then multiply by the heat transfer coefficient.

How to Calculate Heat Flow?

The following steps outline how to calculate the Heat Flow.

  1. First, determine the temperature difference.
  2. Next, determine the R-value. 
  3. Next, determine the overall heat transfer coefficient. 
  4. Next, gather the formula from above = HF = dT / R * HTC.
  5. Finally, calculate the Heat Flow.
  6. After inserting the variables and calculating the result, check your answer with the calculator above. 

Example Problem:

Use the following variables as an example problem to test your knowledge.

temperature difference = 4

R-value = 5

overall heat transfer coefficient = 10HF = dT / R * HTC =  ?