The Erlang loss formula is used to find the blocking probability of a M/M/c/c queue. The extended model takes account for the re-iteration probability.

To use this tool, click on the radio button to set the unknown, write your known parameters, then click on Run.

Erlang(s)

%

Enable extended model

Retry probability

%

G. Zeng, “On the convergence of the Extended Erlang-*Mathematical and Computer Modelling*, vol. 52, no. 1–2. Elsevier BV, pp. 128–133, Jul. 2010. doi: 10.1016/j.mcm.2010.01.022.