Online Erlang Calculator - for Call Centre Staffing (Version 3.2)
Can now calculate up to 10,000 agents!
How To Use This Calculator
- If you have 200 calls per hour, then enter the number of incoming calls as 200 and the period is 60 minutes.
- The Average Handling Time is the amount of time that a person (an agent) takes to handle a phone calls. This includes the talk time as well any paperwork time (wrap-up time) before they are able to answer the next call. This should be in seconds.
- Put in your Service Level target and time. So if you wanted to handle 90% of calls in 15 seconds, put in 90 and 15. If you are uncertain of this the industry "average" is 80% of calls answered in 20 seconds.
- This contact centre staffing calculator is based on the Erlang C formula which was invented by the Danish Mathematician A.K. Erlang.
- We also have a more flexible Microsoft Excel based version of this calculator. You can download the free Excel Erlang Calculator
- This calculator works on probabilities, so may appear to overstate the number of agents needed at low levels. So for example if you enter 0 calls per hour it will say that you need 1 agent. This is quite correct, as there may be a possibility that one call may come in. In practicality, you may decide to not schedule any staff.
- The maxium number of agents that the calculator can calculate before shrinkage is applied is 10,000 Agents.
- Shrinkage is a factor designed to take into account holidays, sickness etc. For more information Read this article on how to calculate shrinkage
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