Every studio has one. The class that sits at four regulars while the rest of the grid runs full. You know the number. You have known it for months. And still the class stays on the schedule, because cutting it feels like a small betrayal of the people who show up and the instructor who built it. This is the decision owners defer longest, and it is almost always a maths problem dressed up as an emotional one.
The reason it stays unsolved is that the cost of an underfilled class is invisible. Nobody complains. The room is quiet, the instructor is paid, the lights stay on. The loss shows up nowhere on a daily report. So it compounds quietly, week after week, while you tell yourself the class will turn a corner it has not turned in a year.
Start with the break-even, not the feeling
Before you decide anything, work out what the class actually needs to earn back. The largest variable cost in the room is the person teaching it. Group fitness instructors are typically paid between $25 and $75 or more per class, with entry-level instructors around $25 to $40 and experienced or specialist instructors at $50 to $75 and above. That figure is your floor. Everything below it is a subsidy you are paying to keep the class alive.
Now put revenue against it. The average boutique class price rose to $21.32 in 2025, up 6% year on year from $20.10. Reformer Pilates classes tend to run higher, around $20 to $30 and as much as $45 in major cities, while HIIT and circuit formats sit between $10 and $35, or $45 and up in big cities. The exact figure matters less than the arithmetic. If your effective yield per head is around $20 and your instructor costs $60 for the hour, three paying bodies covers the teacher and nothing else. Not rent. Not the front desk. Not the reformers depreciating under them.
This is the number owners avoid. Not because it is hard to calculate, but because once you have it written down, the underfilled class stops being a beloved fixture and becomes a line item that loses money every time it runs.
Set a fill-rate threshold and hold it
Fill rate is the cleanest signal you have. It is the percentage of your booked capacity that actually shows up, and it tells you how efficiently you are using your two scarcest resources: the room and the instructor's hour. Industry guidance puts the standard floor for a profitable boutique class at around 70% utilisation, with high-demand classes aiming for 90% and above. The same guidance is blunt about the tail: run consistently below that 70% floor and the room struggles to cover its fixed costs, while classes pushing 90% are the ones you should be building more capacity around, not defending weak ones.
Pick a threshold and commit to it before emotion enters the room. A workable rule for most grids:
- Below 40% fill for eight consecutive weeks, the class is a candidate for the chop. This is not a snap judgement. Eight weeks clears seasonal noise and a bad fortnight.
- 40 to 70% fill, the class is on watch. It gets one honest intervention: a time change, an instructor change, or a format change. One.
- Above 70% and climbing, leave it alone and look at whether the slot around it can take more volume.
The eight-week window matters. It stops you cutting a class that is genuinely finding its feet and stops you protecting one that has been dying in slow motion since spring. Timing is part of the picture too. Midday slots between 1pm and 4pm reliably underperform the rest of the grid, so a weak class in a weak slot is a different problem from a weak class at prime time.
Try the cheaper fixes first
Cutting is the last move, not the first. A class at 45% fill is often a scheduling problem, not a demand problem. Before you retire anything, run the class through three tests.
First, move it. If the class sits in the midday dead zone between 1pm and 4pm, the format may be fine and the slot may be wrong. Early mornings and evenings carry demand for a reason. Second, change the instructor. Attendance is often loyalty to a person, not a format, and swapping in someone with a following can lift a slot without touching the timetable. Third, change the format itself. If reformer at 7am is soft but demand for the room is strong, the answer may be a different class in the same hour rather than an empty one.
Give the class exactly one of these interventions and another four to six weeks. If it does not move, you have your answer, and more importantly, you have a record that you tried. That record is what protects you when a member asks why their class disappeared.
Retire the class without the backlash
The fear that stops most owners is member reaction. It is real, but it is smaller than it feels, and it is manageable. The members who care are the four or five regulars, and they are the people you can speak to directly.
The pattern that works is quiet and specific. Do not announce a cull. Tell the affected regulars personally, before the schedule changes, and point them to the nearest equivalent slot with a warm handover to the instructor there. This matters because attendance frequency is the spine of retention. Returning members take an average of 5.1 classes a month, more than 60 visits a year, and retention holds above 90% once a member reaches their fifth visit. The risk in cutting a class is never the class itself. It is knocking a committed member out of their rhythm and watching the habit break.
Watch the lapse window closely afterwards. Members who go 21 days without a visit show a sharply reduced return probability, and by 45 days most will not come back without direct contact. So the follow-up is not optional. If a displaced regular has not rebooked within two weeks, that is a phone call, not a wait-and-see. Handled this way, cutting a class costs you almost no goodwill, because you moved people rather than dropping them.
What to do with this
Open your grid this week and mark every class by fill rate over the last eight weeks. Anything under 40% goes on a cut list. Anything between 40 and 70% gets one intervention and a four-week clock. For each cut, calculate the instructor cost you recover and the room hour you free, because that hour is not saved, it is redeployed into a slot that can actually fill.
Keep the standard steady rather than personal. A defensible boutique studio holds 70 to 80% annual retention and monthly churn between 2 and 3%, and you protect those numbers by moving members carefully, not by preserving empty rooms. With 79% of studios planning to open new locations within 24 months, the operators who grow are the ones who already know, class by class, which hours earn their keep. Software like kaizenwell can surface those fill-rate trends before they cost you a quarter, but the discipline is the point. The class does not decide when it goes. The maths does.
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