Pick the event, enter the guests, attendance or booth size, and get a headcount per role with the published ratio behind every number, then labor hours, wages, client price and margin at your hourly rates. Every ratio can be changed to your own.
What it does
Change any ratio to your own; the count updates.
7people
2people
Bartenders
On The Fly Tapsters staffing guideSome venues require more: 2 per 75 guests for a full bar (Savoy Museum).
3people
1person
Captain (event lead)
On The Fly Tapsters staffing guideLarge events often add more; set your own count.
1person
Total headcount14
1 staff member per 10.7 guests
Gross margin here is bill minus wages. Employer payroll taxes, workers' comp and insurance come out of it: the bill rate calculator adds them hour by hour.
Each event type is counted against what actually limits it. Catered events count guests: servers by service style (from 1 per 32 guests at hotel minimum to 1 per 8 for French service), bussers per server, bartenders per guest by bar type, barbacks per bartender, and one captain to run the event. Festivals and concerts count peak attendance for crowd managers under the fire code, and only the guests at your bars for bartenders. Trade show booths count floor space. In-store demos count stores, one ambassador per demo table.
Guest-driven roles round up, because you cannot book a quarter of a server. Support roles round down to full groups: 7 servers support 2 bussers at 1 per 3, not 2.33. Booth staff round down too, since 120 square feet still only fits 2 people working at once.
The cost side is plain multiplication: headcount x hours x pay rate gives the wages, headcount x hours x bill rate gives the client price, and the difference is the gross margin before payroll taxes and insurance. The math is published and tested, and every result on this page comes from it.
Plated dinner, buffet, cocktail reception, festival or concert, trade show booth or in-store demo. Each one counts staff against a different number.
Guests for catered events, peak attendance for a festival (the most people on site at one time), square feet for a booth, stores for a demo program. Hours per person run from call time to release, unpaid breaks out.
For a plated dinner, the service level and the table size; for a reception, standard or VIP passing; then whether you staff a full bar, beer and wine, or no bar.
What you pay each worker and what you bill the client, per hour. The defaults are $20 and $50.
Each role shows its count, the ratio used and where the ratio comes from. Type your own ratio over any of them, when the venue, the client or your own experience says otherwise.
The calculator counts people on duty at the same time. Add break relief on long shifts and a standby for the roles you cannot lose, then build the shifts in the event staff schedule template.
A plated dinner at 1 server per 32 guests and one at 1 per 16 are different products. Name the level in the proposal ("wine poured at the table, one server per two tables") so the client knows what the price buys. Our catering staff ratios guide shows what guests see at each level.
A venue can require more bartenders than any rule of thumb; one published venue policy asks for 2 per 75 guests at a full bar. Fire code minimums for crowd managers are not optional where they apply. Read both before you quote.
The counts are people working at the same time. A 10-hour festival day needs break relief, and a role you cannot run short on needs a standby. Our large events guide covers relief and standby planning.
A kitchen down a corridor, a tent across a lawn or a second floor slows every plate. The Straubel reference adds 1 runner per 100 buffet guests; apply the same logic when the walk is long.
More staff in a 10x10 does not mean more conversations; it means a crowded booth. Staff to the space, then rotate. See our trade show booth staffing guide.
A 60% gross margin on wages shrinks once employer taxes, workers' comp and insurance are paid. Run the same rates through the bill rate calculator before you send the quote.
Computed with the calculator's default ratios, rounded up to whole people. Add a captain per event, and bussers and barbacks where they apply.
| Role | Ratio | 100 guests | 150 guests | 200 guests | 300 guests |
|---|---|---|---|---|---|
| Servers, plated dinner (optimum, rounds of 8) | 1 per 24 guests | 5 | 7 | 9 | 13 |
| Servers, buffet | 1 per 40 guests | 3 | 4 | 5 | 8 |
| Passing servers, cocktail reception | 1 per 35 guests | 3 | 5 | 6 | 9 |
| Bartenders, full bar | 1 per 50 guests | 2 | 3 | 4 | 6 |
| Bartenders, beer and wine | 1 per 75 guests | 2 | 2 | 3 | 4 |
Optimum service on rounds of 8, a full bar, 6 hours per person, $20 pay and $50 bill: 7 servers, 2 bussers, 3 bartenders, 1 barback, 1 captain. That is 14 people and 84 labor hours: $1,680 in wages, $4,200 billed and $2,520 of gross margin (60%) before payroll taxes and insurance.
Ratios are published guidance and rules of thumb, attributed to their source; the fire code applies only where your jurisdiction adopted it. The $20 pay and $50 bill rates are examples. Check venue contracts and local rules before you quote. Nothing here is legal advice.
FAQ
It depends on what the staff do. Catered events are counted per guest and by service style: a plated dinner at optimum service needs 1 server per 24 guests (3 tables of 8), a buffet 1 per 40 plus runners. Bars need about 1 bartender per 50 guests for a full bar. Festivals need crowd managers per occupant under the fire code, booths are limited by floor space. The calculator applies the right count for each event type and shows its source.
For a plated dinner on rounds of 8, the Straubel planner reference runs from 1 server per 32 guests (hotel minimum) to 1 per 24 (optimum), 1 per 16 with wine poured at the table and 1 per 8 for French or Russian service. On rounds of 10 the steps are 1 per 30, 20, 15 and 10. A buffet needs 1 server per 40 guests plus 1 runner per 100; a tray-passed reception 1 passer per 35 guests, or 1 per 20 for VIP service.
Two. At 1 bartender per 50 guests for a full bar, 100 guests need 2; at 1 per 75 for beer and wine, 100 guests need 1.33, rounded up to 2. Some venues set their own minimum: one published venue policy requires 2 bartenders per 75 guests for a full bar, so read the venue contract first.
Where NFPA 101 (the Life Safety Code) or NFPA 1 is adopted, an assembly occupancy needs at least one trained crowd manager, and where the occupant load exceeds 250, crowd managers at a ratio of 1 for every 250 occupants. A peak of 2,000 people means 8. Outdoor events and local amendments differ: confirm the count with the fire marshal. This is not legal advice.
A widely used exhibitor rule of thumb is 50 square feet per staffer: 2 people in a 10x10 booth (100 sq ft), 8 in a 20x20 (400 sq ft). That is the number working the booth at the same time; plan relief on top so people can take breaks.
No. Wages here are hours times the pay rate, and the gross margin is the client price minus those wages. Employer FICA, unemployment taxes, workers' comp, insurance and overhead come out of that margin. Use the bill rate calculator to see them per hour.
Guest-driven roles round up: 150 guests at 1 server per 24 is 6.25, and a quarter of a server does not exist, so you book 7. Support roles counted per other staff (bussers per server, barbacks per bartender) count full groups only, and booth staff round down because the floor space is the limit.
From published references listed at the bottom of this page: a meeting planner's catering reference, a licensed caterer's staffing guide, a venue's bar policy, the NFPA crowd manager rule as published by a county fire marshal, and an exhibitor trainer's booth rule. They are starting points, not law (except the fire code where it applies), which is why every ratio can be edited.
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