Enter the emitted radiation and the blocked radiation into the Calculator. The calculator will evaluate the Emissivity. 

Emissivity Formula

E = ER / BR


  • E is the Emissivity ()
  • ER is the emitted radiation
  • BR is the blocked radiation

To calculate Emissivity, divide the emitted radiation by the blocked radiation.

How to Calculate Emissivity?

The following steps outline how to calculate the Emissivity.

  • First, determine the emitted radiation. 
  • Next, determine the blocked radiation. 
  • Next, gather the formula from above = E = ER / BR.
  • Finally, calculate the Emissivity.
  • 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.

emitted radiation = 50

blocked radiation = 60