Enter the energy loss rate (BTU/hr) and the design temperature difference (F) into the Annual Heat Loss Calculator. The calculator will evaluate the Annual Heat Loss. 

Annual Heat Loss Formula

The following two example problems outline the steps and information needed to calculate the Annual Heat Loss.

AHL = ELR / dT * 24 * 365


  • AHR is the Annual Heat Loss (BTU/F)
  • ELR is the energy loss rate (BTU/hr) 
  • dT is the design temperature difference (F) 

How to Calculate Annual Heat Loss?

The following steps outline how to calculate the Annual Heat Loss.

  1. First, determine the energy loss rate (BTU/hr). 
  2. Next, determine the design temperature difference (F). 
  3. Next, gather the formula from above = AHL = ELR / dT * 24 * 365.
  4. Finally, calculate the Annual Heat Loss.
  5. 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.

energy loss rate (BTU/hr) = 50

design temperature difference (F) = 15

AHL = ELR / dT * 24 * 365 = ?