Estimate concert and event capacity for any floor configuration.
How to use
Getting started
Configurations
Reading results
Assumptions
1
Enter the gross space. Use a single area measurement or enter Length × Width. Dimension mode uses linear feet, yards, or meters; single-area mode also supports acres.
2
Choose how to deduct non-audience space. Quick Estimate applies a TSE planning preset. Detailed Estimate subtracts known stage, FOH, production, service, and unusable areas, then applies an operational reserve.
3
Pick a configuration that matches the event: Standing, Chairs only, Round tables, Rect tables, or a Combination of standing and seated zones.
4
Review both outputs. Planning capacity estimates the physical layout. IBC reference occupant load is shown separately and does not determine permitted occupancy.
Standing — General admission floor. Use density preset to control crowd tightness.
Chairs only — Theater or ceremony rows. Choose the 7-net-sq-ft IBC occupant-load reference, a 10-sq-ft planning allowance, or a custom value.
Round tables — Banquet style. Choose 48", 60", or 72" diameter. Guest choices automatically stay within a reasonable range for the selected size.
Rect tables — Banquet or classroom style in 6 ft or 8 ft lengths. Classroom layouts are automatically limited to one-side seating: 3 persons at 6 ft or 4 at 8 ft.
Combination — Split the audience floor between standing and seated zones. The relevant table or chair controls appear directly below the combination selector.
Gross floor — The total venue area entered before deductions.
Total deductions — The quick-estimate allowance, or actual fixed deductions plus the operational reserve in detailed mode.
Audience floor — Floor remaining for the selected attendee layout after deductions.
Planning capacity — Estimated persons for the chosen physical layout and planning density.
IBC reference load — A separate area-based occupant-load calculation using 5 net sq ft/person for standing, 7 net for chairs only, and 15 net for tables and chairs.
Detail card — Changes by mode: density (sq ft/person) for standing, table count for round/rect modes, and a standing/seated person split for combination mode.
Important: These are planning estimates. Your local fire marshal sets legally permitted occupancy — always verify before ticketing.
Floor & space
Quick Estimate
TSE planning presets deduct 15% for light production, 20% for a standard concert, 25% for production-heavy layouts, or 30% for extensive production and floor restrictions. These are estimating presets, not code requirements or universal industry standards.
Detailed Estimate
Subtracts entered stage, FOH, barricade/security, production, service, structural, and other unavailable areas. A separate 5%, 10%, 15%, or custom operational reserve is then applied to the remaining floor.
Shape
Calculations assume a regular (rectangular) floor plan. Odd-shaped or multi-room venues will have a lower effective usable ratio.
Standing density
IBC reference — 5 net sq ft
2024 IBC Table 1004.5 occupant-load factor for standing space. It is a design occupant-load reference, not a universal safe or comfortable operating density.
Standard planning — 6 sq ft
A tighter general-admission planning preset. Appropriate density varies with the crowd, alcohol service, movement, barricades, sightlines, security plan, and emergency procedures.
Comfortable planning — 8 sq ft
A roomier planning preset for events where circulation and audience comfort are priorities.
Chairs only (theater / concentrated)
IBC reference — 7 net sq ft
2024 IBC Table 1004.5 occupant-load factor for concentrated assembly seating with chairs only and no tables.
Comfortable planning — 10 sq ft
A roomier event-planning allowance intended to accommodate practical row and cross-aisle spacing. Actual layouts must be drawn and checked.
Tables and chairs — code reference
IBC reference — 15 net sq ft
2024 IBC Table 1004.5 uses 15 net sq ft/person for unconcentrated assembly with tables and chairs. The table calculations below instead estimate physical layout capacity from planning footprints and selected seats per table.
Round tables
Planning basis
The 77, 95, and 116 sq-ft values are tight planning footprints that include chair-clearance and shared-circulation allowances. They are not IBC-prescribed table footprints.
Aisle caution
For level or ramped assembly aisles, 42" generally applies with seating on both sides and 36" with seating on one side; limited exceptions can permit 36" when serving fewer than 50 seats or 30" when serving fewer than 15 seats and not forming an accessible route. Table aisle-accessway clearance is measured from a point 19" from the table edge. Confirm the adopted code and actual arrangement.
Footprint calculation
Planning footprint = (diameter + 36" combined chair allowance + 21" shared-circulation allocation) squared. This is a capacity-estimating convention, not a code formula.
48" round
77 sq ft per table. (48 + 36 + 21 = 105" = 8.75 ft → 8.75² ≈ 77 sq ft.) Seats up to 6.
60" round
95 sq ft per table. (60 + 36 + 21 = 117" = 9.75 ft → 9.75² ≈ 95 sq ft.) Seats 8 comfortably.
72" round
116 sq ft per table. (72 + 36 + 21 = 129" = 10.75 ft → 10.75² ≈ 116 sq ft.) Seats 10 comfortably.
Rectangular tables
Planning basis
Rectangular values are planning footprints that allocate space for chairs and shared circulation. They do not establish code-compliant aisles or aisle accessways.
Table footprints include local chair and shared-circulation allowances. Quick and detailed deductions address production and room-level constraints; avoid entering the same unavailable area twice.
Accessibility & egress
The calculator does not determine accessible routes, wheelchair and companion locations, sightlines, exit count or capacity, travel distance, barricade design, or life-safety staffing.
Code sources
IBC 2024 §1004.5 provides the occupant-load factors. §1030.9.1 and §1030.13.1 address assembly aisles and table seating. Verify the edition and amendments adopted locally.
Authority
All outputs are planning estimates only. Permitted occupancy is determined by the local authority having jurisdiction (AHJ) — typically the fire marshal.
Space size
Space deductions
Quick estimate
Detailed estimate
TSE planning presets for early indoor-concert estimates. Use Detailed Estimate when actual floor-plan deductions are known.
The reserve is applied after fixed deductions. Enter each unavailable area only once; this calculator does not replace a drawn egress or accessibility plan.
Standard concert planning allowance: 20% of gross floor.
Configuration
Standing
Chairs only
Round tables
Rect tables
Combination
Each 60" round uses a ~95 sq-ft planning footprint including chair clearance and shared circulation.
Each 8 ft banquet uses a ~92 sq-ft planning footprint including chair clearance and shared circulation.
50%
50%
Density
Results
Gross floor
—
sq ft
Total deductions
—
sq ft
Audience floor
—
sq ft
Planning capacity
—
persons
IBC reference load
—
area-based occupants
Detail
—
Planning estimates only. The IBC reference load uses 2024 IBC Table 1004.5 area factors: 5 net sq ft/person for standing space, 7 net for concentrated chairs only, and 15 net for unconcentrated tables and chairs. It is not the permitted occupancy. Exit capacity, aisle and aisle-accessway geometry, accessible routes, fire protection, local amendments, and the authority having jurisdiction may require a lower limit. Verify the adopted code and approved layout before ticketing.
