Calculator that uses the formulas of: Erlang B Erlang C Engset Depending on the used model you can obtain: 1. Blocking probabilities. 2. Waiting probabilities. 3. Lost traffic, offered traffic and carried traffic. 4. Load factor. 5. Traffic congestion. 6. Queued calls and calls in the system. 7. Duration of calls queued and duration of calls in the system. You can also obtain graphs of the blocking and waiting probabilities with respect to the number of available channels.