Enter the call arrival rate (calls/min) and the average call-holding time (min) into the Calculator. The calculator will evaluate the Erlang Loss Formula. 

Erlang Loss Formula

E = l * h


  • E is the Erlang Loss Formula (calls)
  • l is the call arrival rate (calls/min)
  • h is the average call-holding time (min)

To calculate the calls from the Erland Loss Formula, multiply the call arrival rate by the average call-holding time.

How to Calculate Calls From Erlang Loss Formula?

The following steps outline how to calculate the calls from the Erlang Loss Formula.

  1. First, determine the call arrival rate (calls/min). 
  2. Next, determine the average call-holding time (min). 
  3. Next, gather the formula from above = E = l * h.
  4. Finally, calculate the Erlang Loss Formula.
  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.

call arrival rate (calls/min) = 200

average call-holding time (min) = 100