WFA
Tools
CALCULATORS & TOOLS

WFM Tool Suite

Last verified: March 2026

18 calculators built by practitioners. Free tools require no account. Pro tools unlock with email.

Core WFM calculators — no account required. Erlang C, shrinkage, and FTE headcount.

Open
Erlang C Calculator
Calculate agent staffing from call volume, AHT, and service level targets.
Open
Shrinkage Calculator
Account for absence, breaks, training, and non-productive time.
Open
FTE Headcount
Convert required hours into full-time equivalent headcount.