Contact Center Simulator
Erlang C — the formula contact centers actually use to size staffing. Drag the sliders and watch required agents and service level update live. The chart at the bottom is the interesting part: service level doesn't move gradually with agent count, it can swing hard with just one agent either way.
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agents required on the phones
Agents vs. service level
Same offered load, one agent at a time. Notice how little room there often is between "well under target" and "comfortably over."