Event Staffing Calculator
How many staff an event needs — servers, bartenders, security and supervisors — from the guest count and service ratios, with the hours including setup and pack-down, the cost, and the effect of volunteers.
Staffing is ratios: one server per so many guests, set by the service style; one bartender per 50 to 100; one security officer per 100 or so; a supervisor for every eight to ten staff.
How the event staffing calculator works
Staffing is ratios: one server per so many guests, set by the service style; one bartender per 50 to 100; one security officer per 100 or so; a supervisor for every eight to ten staff. Multiply by the event hours plus setup and pack-down and you have the labour hours; at a loaded hourly rate, the cost. Volunteers replace a share of the paid hours — but not usually the bar, the security or the supervisors.
Formula: staff = ⌈guests / ratio⌉ per role; hours = staff × (event + setup); cost = paid hours × rate
Worked examples
| Inputs | Total staff | Note |
|---|---|---|
| 300 guests, plated service | 36 | 35 staff |
| Cocktail service | 21 | far fewer servers |
| Half the servers volunteer | 36 | cost falls by a third |
FAQFrequently asked questions
How many servers per guest?
One per 10 to 12 for plated dinner service, one per 15 to 20 for buffet, one per 25 for a standing reception with passed food. Fine dining goes as low as one per eight.
How many bartenders?
One per 50 to 75 guests for a full bar, one per 100 for beer and wine only. Under-staffing the bar is the complaint guests remember.
Do I need security?
For public events, licensed venues and anything over a few hundred, usually yes — one per 100 guests is a common licensing condition. Private dinners often need none.
What do volunteers actually replace?
Serving, registration and setup — with training and supervision. They should not replace bartenders, security or supervisors, which is why the page discounts server hours only.
What is a loaded hourly rate?
Wages plus on-costs, agency margin and any penalty rates for evenings or weekends. Thirty to fifty an hour covers most markets for agency event staff.
Where these figures come from
- US FDA Food Code — food service guidance — holding and service context behind catering quantities
- UK Food Standards Agency — the UK food regulator
Last checked: September 2026. Portion and spacing figures are standard catering and event-industry conventions, stated on each page.