Class capacity and utilization
Every studio has a hard ceiling on revenue that most owners have never calculated: spots per class × classes per week × what a filled spot earns. Knowing your ceiling, and how close you run to it, answers the questions owners usually guess at: how many members can we serve, when do we raise prices, and when is it time for [a second room or location](/guides/open-a-second-studio-location). The math takes ten minutes. Here it is.
Calculate your ceiling
Weekly spot supply = class capacity × weekly classes. A 14-spot room running 32 classes a week supplies 448 spots.
Realized utilization = spots filled ÷ spots supplied. If those 32 classes averaged 9 attendees, you ran 288/448, 64% utilization.
Revenue per spot = what an attended spot actually earns, blended across memberships, packs, and drop-ins. (Take last month's class-driven revenue and divide by attendances.)
Now the whole business is three dials. At $18 blended revenue per attendance, the studio above grosses about $22,400 a month at 64% and would gross $30,200 at 86%. Same rent, same instructors, same software: the difference between those two numbers is pure operations, which is why utilization belongs on your monthly metrics sheet next to churn.
How many members does that support?
Work backwards from attendance habits. If your average member attends 6 times a month and you can serve roughly 1,250 attendances a month at 80% utilization, your comfortable ceiling is around 200 active members. The point of the number is not precision; it is knowing which problem you have:
- Well under ceiling (utilization below ~60%): you have a demand problem. Marketing, intro-offer conversion, and schedule pruning matter more than anything else.
- Near ceiling (peak classes full, waitlists persistent): you have a supply problem, which is the good problem. Add sections, expand hours, or raise prices; persistent excess demand is pricing information.
- Lopsided (6pm sold out, 2pm empty): you have a distribution problem, the most common one, and it is solved with schedule design and off-peak strategy, not more marketing.
What healthy utilization looks like
Chasing 100% is a mistake; a studio with every class full has no room for new members, intro offers, or the waitlist conversions that feed growth. Healthy boutique operations generally sit in the 70-85% band on their scheduled classes, with peak slots pushing 90%+ and off-peak carrying deliberately lower targets. Below 50% average, classes feel empty, which itself hurts retention; energy is part of the product in group fitness.
Two structural notes. First, average utilization hides the story: always look at fill by slot, since a 64% average is usually a few sold-out peaks and a tail of near-empty experiments (the pruning method is in schedule optimization). Second, unlimited-membership studios should watch attendance frequency alongside utilization: rising per-member attendance with flat membership means your heaviest users are consuming your peak supply, which changes the pricing calculus.
Capacity is also a floor-plan decision
Physical capacity is settable: reformer count, bike count, mat spacing. Before adding equipment to raise a class from 12 to 14 spots, check that demand actually presses the current cap (waitlist depth tells you) and that the incremental spots do not degrade the experience the premium price is buying. Boutique members pay for small; the fastest way to become a mediocre big class is two rows at a time.
When the numbers say you are genuinely supply-constrained, in most slots, most weeks, with healthy prices, that is the trigger to model expansion seriously, and the second location guide covers when that bet makes sense.