Event and Catering Cost Calculator

An event budget where the guest count does the multiplying

Almost everything at an event scales with the guest list: food, drink and dessert per guest, the settings they eat from, and a service charge riding on the food and drink. Around that scaling core sit the fixed pieces, staff by the hour, equipment hire, the venue, transport, which the guest count does not move at all. This page keeps the two kinds separate, prices each at your rates, applies any minimum charge openly, adds contingency once and tax once, and reports the total and the figure everyone actually quotes: the cost per guest, with a downloadable estimate.

Per guest

The count you are catering for. Final numbers are usually confirmed to the caterer days before; this is the count the budget hangs on until then.
Applied to the food, drinks and dessert lines only, which is the usual basis. If your caterer charges on a different base, adjust the percentage so the dollars agree.

Staffing and the fixed pieces

Minimum, contingency, tax and range

Applied once, on the subtotal (or the minimum-charge base) plus contingency.

Disclaimer: This calculator gives estimates for general information only. It is not financial, medical or other professional advice. Final guest numbers, service charges and hire terms are set by your agreements with the caterer and suppliers; this page prices the agreements you describe.

What this calculator does

It budgets an event the way caterers build one. The variable core scales with the guest count: food, drinks, dessert and settings, each multiplied honestly by the number of guests, plus a service charge applied to the food and drink lines it customarily rides on. The fixed shell does not scale: staff are priced as people times hours times a rate (because a five hour event with setup costs more service than a three hour one at the same covers), equipment and venue are hired for the event rather than the guest, and transport delivers once. The estimator discipline finishes the job: lines rounded to cents, any minimum spend or charge applied openly (small events meet caterers’ minimums constantly), contingency once for the consumables that run long and the breakages that happen, tax once, your range, and the total divided by guests into the per-head figure that speeches, committees and couples plan around.

How to use it

  • The per-guest lines are a menu decision wearing a number. Food per guest is where menu ambition lives, and small movements there multiply by the whole guest list: five dollars more per head is $600 at 120 guests before the service charge joins in. Costing menus per guest here, rather than comparing package names, is how the food budget stays a decision instead of a surprise.
  • Drinks are estimated, and the estimation method is the risk. A fixed package per guest is a known line; consumption billing (pay for what is opened) is a forecast that depends on the crowd, the weather and the length of the event. Enter the drinks line as the realistic per-guest expectation, and let the contingency and the range carry the honesty about which kind of number it is.
  • Staff hours include the hours guests never see. Setup before and clear-down after are worked time, often a third of the shift. Entering only the reception hours understates the line by exactly the part of the day with no guests in it, which is the part that still has to be paid.
  • The service charge base matters more than its rate. Eighteen percent on food alone and eighteen percent on food, drink and dessert are different charges wearing the same number. This page applies it to the three lines named on the form; check your caterer’s agreement for their base and mirror it here.
  • Minimums govern small events. Below a certain size, a caterer’s minimum spend or charge is the price, and trimming the menu trims nothing. The minimum field exists so a 20 guest budget can show that honestly instead of implying a per-guest economy the caterer never offered.

How it is calculated

  • Per-guest lines = guests x the rate per guest, for food, drinks, dessert and settings. Service charge = service charge % x (food + drinks + dessert lines).
  • Staffing = staff x hours x rate per hour. Equipment hire, venue, transport and other charges enter flat.
  • Subtotal = the sum of the line amounts, each rounded to cents. Minimum charge: if a minimum is entered and exceeds the subtotal, the minimum becomes the base and the results state that the minimum charge applied. Contingency applies once to the base; tax once to base plus contingency. Total = base + contingency + tax. Per guest = total / guests. Range = total less and plus your percentage.

Worked examples

A wedding reception for 120. Illustrative figures: food at $38 a guest is $4,560.00; drinks at $14, $1,680.00; dessert and extras at $6, $720.00; settings at $4.50, $540.00. The service charge at 18% on the food, drink and dessert lines ($6,960.00) adds $1,252.80. Six staff for 5 hours at $22 is $660.00; equipment hire $850; venue $1,500; transport $240. Subtotal $12,002.80; contingency at 5% adds $600.14 for a total of $12,602.94: $105.02 per guest, ranging from $11,342.65 to $13,863.23 at plus or minus 10%.

Fixed versus variable, read off the same example. Of that total, $3,290 (venue, equipment, transport and staff at this size) barely moves if the list grows by twenty, while the per-guest lines and their service charge add roughly $74 for every extra guest. That split is the entire logic of event budgeting: the guest list is the budget lever, and the fixed shell is the price of holding the event at all.

A small dinner meets the minimum. Ten guests with food at $20 a head is $200.00 of catering, against a caterer’s $500 minimum charge. The estimate builds on the minimum and totals $500.00, $50.00 per guest, stating that the minimum charge applied. At this scale the honest per-guest figure is the minimum divided by the guests, and adding guests is nearly free until the lines pass the floor.

Reading your results

Read the per-guest figure as the headline and the split as the story. If a budget must fall, the per-guest lines are where cuts reduce the total proportionally (a simpler menu, a shorter drinks package), while cutting fixed pieces either descopes the event itself or does not happen. Then stress the guest count: run the final confirmed number and the optimistic one, because catering is ordered on a deadline against a list that keeps moving, and the difference between the two runs is the honest size of the risk the organiser carries.

Limitations

  • Gratuity and the service charge are not the same thing. Agreements differ on whether the service charge reaches the staff, is shared, or is house revenue, and additional gratuity may be customary, expected or already covered. This page prices the service charge as a line because it is charged as one; what it is called does not change the total, and the agreement’s wording governs the rest.
  • Consumption billed items are forecasts. Opened-bottle billing, corkage overages and bar tabs settle on the night. The drinks line should carry the expectation, and the contingency should carry the variance; neither converts a forecast into a fixed price.
  • Rental breakage and loss settle afterwards. Hire agreements charge for damage and missing items after the event. A realistic budget carries them in the contingency, and a careful count at collection is the only real control.
  • The venue’s own rules price themselves in. Curfews, approved-supplier requirements and venue staffing minimums appear as constraints on other lines rather than as charges of their own. The flat venue line takes the hire fee; the constraints belong in the staffing and supplier figures you enter.

Frequently asked questions

How is catering usually priced?

Mostly per guest for the consumables (food, drink, dessert and the settings to serve them), plus staffing by the hour, plus flat hire for equipment and the venue, plus a service charge applied to the food and drink, plus tax. This page reproduces that structure line for line, which is why a menu change shows up multiplied by the guest count while a venue change does not. Package prices (“$95 per head, everything included”) are the same structure pre-summed; separating them is how packages get compared.

What does the service charge actually cover?

On most catering agreements it is a percentage added to the food and beverage lines toward the cost of servicing the event: the planning, the service operation and the staff organisation behind the hourly lines. Whether any of it reaches the serving staff depends on the agreement and local practice. For budgeting, the honest treatment is the one used here: a charged line on a stated base, at the percentage printed in your agreement.

How many staff does an event need?

It depends on the service style: plated service needs more hands per guest than a buffet or stations, and bar service is staffed by drink volume as much as by heads. Caterers staff to their ratios and quote the count; this page prices the count you are quoted (people x hours x rate) rather than inventing a ratio, and the hours should include setup and clear-down, which typically add a third to the shift.

Why does adding guests cost less than the average per guest?

Because the fixed shell (venue, equipment, transport, and staff at the size already booked) does not grow with the list, so each extra guest adds only the per-guest lines and their service charge: on this page’s example, roughly $74 against an average of $105.02. The average falls as the list grows, which is the arithmetic behind both generous invitations and minimum charges: below the point where per-guest lines carry the shell, the caterer’s minimum sets the price instead.

Related calculators

Method: per-guest lines scaled by the guest count with the service charge on food, drink and dessert; staffing by people, hours and rate; fixed charges flat; minimum charge applied to the base, contingency once and tax once, exactly as defined on this page. Last reviewed: 13 October 2026.