A full class can still lose money, and a half-empty one can still turn a profit — it depends entirely on cost per class, a number most studios track loosely if at all.
Instructor cost is the obvious one
What you pay the instructor for that class, whether flat rate or per-head. This is the cost everyone accounts for, because it's the easiest to see on a pay stub.
Facility cost is the one that gets forgotten
Room rental, equipment wear, utilities — the facility cost per class is real even when no invoice arrives for it that day. Leaving it out of the math makes every class look more profitable than it actually is.
Revenue isn't profit
Attendees times price per class gives you revenue. Revenue minus the total cost — instructor plus facility — gives you the number that actually matters: profit per class, which can be negative even on a well-attended class if the price is set too low.
Use the calculator instead of eyeballing attendance
The Class & Session Pricing Calculator runs this exact sequence — instructor and facility cost into a total, then attendance and price into revenue and real profit. Open it in FLYNT Sheets, and once you know a class is genuinely profitable, pitch a package around it with the Class & Session Package Pitch template.