The Real Commercial Formula
How commercial gyms are actually sized — the four calculations that decide how many members your floor, your machines and your peak hour can really support.
Four numbers decide your membership ceiling
Most operators size their gym by square footage alone. The reality is a chain of four calculations — usable area, space per member, machine throughput and peak-hour utilisation. Get any one wrong and you either overcrowd the floor at peak times or leave revenue on the table.
Usable Floor Area (UFA)
This is net training space, not the building size.
Exclude from UFA
Example: In a 10,000 sq ft building → ~6,500–7,000 sq ft usable.
Space Per Member
Industry standard — the core of the calculation.
Low-cost model
1 member per 60–80 sq ft
Mid-market model
1 member per 80–100 sq ft
Premium / boutique
1 member per 100–150 sq ft
Determines how many people can be in the building at once without overcrowding.
Machine Throughput Factor (MTF)
How the number of machines affects membership capacity.
Industry rule
Every resistance machine supports 40–60 members.
Why? Only 5–8% of members train at peak hour, and machines rotate every 6–10 minutes.
Example: 30 machines × 50 members = 1,500 members supported.
Peak-Hour Utilisation (PHU)
The real-world adjustment.
Peak hour
5–8% of members
Per day
12–15% of members
Per month
70–80% of members
Formula
Peak Hour Members = Total Members × 0.06 (average)
Your gym must handle this number without bottlenecks.
A worked calculation
A gym with 7,000 sq ft usable area, 40 machines and mid-market spacing (90 sq ft per member). Here's how the four numbers combine to reveal the true membership ceiling.
Input
7,000 sq ft
Usable Floor Area
Input
40
Resistance machines
Input
90 sq ft
Per member (mid-market)
Step 1 — Floor capacity
7,000 ÷ 90
77
members at once (floor capacity)
Step 2 — Machine capacity
40 × 50
2,000
members (machine capacity)
Step 3 — Peak-hour demand
2,000 × 0.06
120
peak-hour members
Step 4 — True capacity
77 ÷ 0.06
~1,250
true membership capacity
Floor can handle 77 at once, but peak hour demands 120 → the floor would be overcrowded.
Final membership capacity = ~1,250 members.
Membership capacity calculator
Adjust your usable area, machine count, market positioning and peak-hour percentage to see the true membership ceiling for your facility — and whether your floor will bottleneck at peak times.
Membership capacity calculator
Your calculation
True membership capacity
1,283
members (capped)
Run the numbers on your space
Book a consultancy and we'll calculate the true membership capacity of your floor — and specify the kit and layout to reach it.