Venue Capacity Calculator
How many people a room holds from its floor area, in each standard layout — theatre, classroom, banquet, cocktail, boardroom — after deducting the space taken by stage, bar and circulation, with whether your guest count fits.
Venue capacity is floor area divided by the space each person needs, and that depends entirely on the layout: standing guests at a cocktail reception need about 0.
How the venue capacity calculator works
Venue capacity is floor area divided by the space each person needs, and that depends entirely on the layout: standing guests at a cocktail reception need about 0.6 square metres each, theatre seating 0.8, round banquet tables 1.2 or more, classroom tables 1.5, a boardroom 2.5. First deduct what is not available for guests — a stage, a bar, a dance floor, the circulation routes — and the number falls by a fifth or more.
The densities are inputs because fire codes and venue policies set their own.
Formula: capacity = area × (1 − deductions) / space per person
Worked examples
| Inputs | Capacity in the chosen layout | Note |
|---|---|---|
| A 400 m² room | 266 | 266 at banquet |
| Theatre style | 400 | 400 |
| Standing reception | 533 | 533 — fits |
FAQFrequently asked questions
How much space does each guest need?
About 0.6 m² standing, 0.8 seated in rows, 1.2 to 1.5 at round tables, 1.5 at classroom tables and 2.5 around a boardroom table. Venues and fire codes publish their own figures.
What should I deduct?
Stage, bar, buffet, dance floor, registration desk and the aisles to reach the exits. Fifteen to twenty-five per cent is normal; a gala with a stage and dance floor can lose a third.
Why does the venue quote a bigger number?
Often the theatre figure for an empty room. Ask for the capacity in your layout with your staging, and check it against the fire certificate.
Can I mix layouts?
Yes — allocate area to each part and compute them separately. A conference with a theatre session and a standing lunch needs the larger of the two to fit at once.
What about ceiling height and columns?
Neither is in the arithmetic, and both matter: columns break up banquet layouts and low ceilings make a dense cocktail crowd unpleasant. Walk the room.
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.