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Reply To: Call Center Staffing Calculator

Tom Howard


The Erlang C traffic model makes some assumptions about the nature of the traffic into a call center (see They include

– Call arrivals are random
– Service times are exponential
– Callers are answered in the order of arrival

If call arrivals are not random, then Erlang C can tend to underestimate the agents needed. For example, if you have a sudden peak of calls, you’ll need more agents than normal to handle that peak.

If you’d like to send me some example figures, I can check them against our tools and make sure CC-Excel is giving you the expected results. My email address is

All the best,
Tom Howard,
Westbay Engineers Ltd.