Free Erlang traffic calculators

The world's first online Erlang traffic calculators

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Erlang C Calculator
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Erlang C Calculator

Erlang C Calculator
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Calls per hour
Call duration (s)
Avge. delay (s)
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Brief instructions

Here is a brief introduction to the calculator. For more detailed information, press the Help Button. For a running record of the results calculated, press the Results button. Both these functions open new browser windows on your desktop.

  • This calculator, which is based on the Erlang C traffic model, can tell you how many agents you need in your call centre during an hour. To work this out, you need to know how many calls you receive during that hour, the average duration of those calls and the average delay you will tolerate in answering all your calls.
  • This calculator can also used to establish the number of switchboard operators required.
  • To use the calculator, enter the figures for the number of calls, average duration of calls and average delay to calls in the edit boxes. Remember that call duration should include any wrap up times (see help system for more information). When you press the Calc. button, the required number of agents will be displayed in a message box.
  • You can display a running total of calculation results by pressing the Results button.
  • It is important to understand that there is a bare minimum of agents you will need, regardless of the call answering delays which you are prepared to tolerate. The calculator will not display a number of agents below this minimum as this would result in an unstable situation in which the number of calls queued would constantly increase, leading to abandoned calls. For more information, refer to the help system.

Windows version of this calculator

The Erlang C Traffic Calculator on this page is modelled on the Erlang C Calculator included with the Westbay Traffic Calculators for Windows. The calculator works up to 1 million  calls per hour and has the ability to display and print the results of any calculations you have made during the previous week.

Erlang C Calculator for Windows

Customers also benefit from an Erlang B Calculator, Extended Erlang B Calculator and a Call Minutes Calculator. These calculators are available for 99 US Dollars.  If you pay using VISA, MasterCard, American Express or Discovery, you can have this software working on your PC in five minutes!

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Last modified: 05 June 2017

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