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Erlang C Call Queue Calculator

Estimate how often calls wait, how long they wait and how many agents a service-level target needs.

busy-hour average, 0.01 to 36,000
seconds, including after-call work
simultaneous agents, 1 to 1,500
seconds, 0 to 3,600
percent, 0.01 to 99.9

Erlang C assumes random call arrivals, exponentially distributed handle times, identical agents and an unlimited queue with no abandonment or retries. Results show scheduled concurrent agents before shrinkage, not roster headcount; all calculations stay in your browser.