Formula
Service staff = ceil(attendees ÷ guests per service staff)
Setup staff = ceil(setup labor hours ÷ hours per setup worker)
Supervisors = ceil((service + setup staff) ÷ staff per supervisor)
What the result means
The total is a simultaneous planning head count based on the entered ratios. Specialized roles such as bartenders, security, cooks, technicians, and venue-required personnel are not included unless you add them to the plan separately.
Planning estimate only. Confirm vendor terms, contracts, venue rules, accessibility requirements, and local safety limits before committing.