Enter the surface area (ft^2), the temperature differential (F), and the R-value into the Heat Loss from R-Value Calculator. The calculator will evaluate the Heat Loss from R-Value. 

Heat Loss from R-Value Formula

The following formula is used to calculate the Heat Loss from R-Value. 

HLR = SA * dT / R

Variables:

  • HLR is the Heat Loss from R-Value (BTU/hr)
  • SA is the surface area (ft^2) 
  • dT is the temperature differential (F) 
  • R is the R-value 

How to Calculate Heat Loss from R-Value?

The following steps outline how to calculate the Heat Loss from R-Value.


  1. First, determine the surface area (ft^2).
  2. Next, determine the temperature differential (F). 
  3. Next, determine the R-value. 
  4. Next, gather the formula from above = HLR = SA * dT / R.
  5. Finally, calculate the Heat Loss from R-Value.
  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.

surface area (ft^2) = 5

temperature differential (F) = 7

R-value = 8HLR = SA * dT / R =  ?