Erlang C Formula

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Definition: Erlang C Formula

The Erlang C formula calculates the probability that a request has to wait due to the resources or servers being busy. Hence, this probability is sometimes called as Waiting Probability.

The formula can be given as,

erlang c


PW = waiting probability

A = total traffic offered in Erlangs

N = number of resources or servers

And the call arrivals follow a Poisson distribution.

The Erlang C formula is used to calculate the minimum number of servers of resources that would be required to achieve a required probability of service delivery during peak times with a limited probability of waiting for the requests.

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