Enter three items and calculate the fourth.
|Number of calls in the busiest hour|
|Average duration of a call in seconds|
|Percentage of calls blocked|
Another way of stating this is that the Erlang B algorithm calculates the percentage number of callers who get a busy tone whilst the Erlang C algorithm calculates the percentage number of callers who have to wait to be answered.
For a more sophisticated way of performing an Erlang C calculation please go to https://www-ens.iro.umontreal.ca/~chanwyea/erlang/erlangC.html