How big should a venue be for 100 guests?

Usable means what is left after you take off the stage, bars, buffet and any pillars. Then check the occupancy number the fire marshal posted for the room. The 2021 International Building Code counts 15 square feet per person at tables and chairs (Table 1004.5), which makes 1,500 square feet the code number for 100 seated guests. Your local code may differ. If the sign and the planner math disagree, the sign wins.

Layout matters as much as area. A hundred guests is 10 rounds of 10 (72 inch) or 13 rounds of 8 (60 inch), and you need aisles wide enough for service and a clear path to the exits.

Example room: 40 x 30 ft

That is 1,200 sq ft. A bar and buffet take 200, leaving 1,000 usable.

• Seated dinner at rounds: 83 to 100 guests by the planner rule (1,000 / 12 up to 1,000 / 10).
• Code count at tables and chairs: 66 (1,000 / 15).
• Rows of chairs for a ceremony: 125 to 166 by the planner rule, 142 by the code count (1,000 / 7).

The calculator plans for the lower of the two, so this room seats 66 for dinner and 125 for a ceremony, unless the posted sign says otherwise. Inside MyVenueHQ, Layouts under Tools draws each room. To try it first, use the free event floor plan maker.

Where MyVenueHQ fits

Draw the room to scale before you promise a headcount. The free floor plan maker places real banquet tables and shows the layout in 3D, with no account. Free event floor plan maker.