Erlang-C calcuator
Just set the call duration that you’re using (how long the agent is typically on the phone, for cold-calling, this will usually be 2.
To use this, just call OptimalStaffing, with the parameters: (# of calls, Ideal Immediate answer rate) Like this:
OptimalStaffing(300,.9);
This means, find me the right amount of staff I need for 300 calls, where 90% of them are going to be answered immediately.