Calculators that show their working.
The same engine that runs inside SureWFM, opened up and made free. No signup, no email wall, no “request access”. Every result comes with the full calculation trace, so you can check it, or paste it into the deck you have to defend on Monday.
Erlang C calculator
How many agents you need in an interval to hit a service-level target, with the occupancy cap and shrinkage applied where they actually belong.
Shrinkage calculator
Total shrinkage built from its actual parts, and the rostered FTE it implies, with unpaid breaks handled correctly and the divide-versus-multiply error shown explicitly.
Occupancy calculator
Occupancy from volume, AHT and headcount, the burnout ceiling flagged before you schedule to it, and the headcount needed to get back under it.
Service level calculator
The reverse of Erlang C. Start from the headcount you already have and see the service level, ASA and how far off your target you are.
Call center staffing calculator
The same maths in plain English, for anyone who has not staffed a contact center before. Four questions, and every bit of jargon explained on the page.
Because the maths was never the secret.
Erlang C is a published 1917 result. Every workforce management vendor uses it, including the ones that call it a proprietary AI algorithm in the sales deck.
What is actually hard is everything around it: getting clean interval data in, applying shrinkage in the right place, holding a forecast still long enough to schedule against it, and keeping the whole chain auditable when someone asks why the number changed.
So the formula is free. If you want it running against your real data, every interval, every queue, with the trace attached: that is the product.