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A slot's capacity isn't what fits, it's what you can serve well
When you're done, every table, class, professional, or machine has its real seat count set and written down, not eyeballed, and you know to respect it when confirming each booking.
By Yodai · Published September 6, 2026 · Updated October 12, 2026
There are slots for one spot and slots for several, and each one needs the real number of spots it can comfortably handle, not the number that just looks like it fits. You've got a table with four chairs, a room with twenty mats, or three manicure stations, and you have to decide one number: how many spots that slot can take.
You put in the first number that comes to mind: however many chairs there are, however many mats fit, and move on. But that number isn't a furniture count. It's a promise you make to every person who books: that they'll fit comfortably, that they'll be looked after well, that they won't be bumping into anyone else.
If the number is wrong, the promise breaks inside the appointment itself, not before it: you don't notice it at booking, you notice it once the class is already full or the table is already seated. You have to decide, slot by slot, exactly how many spots each one holds, and that number isn't the same for a table as it is for a spin class.
Count what's physical, then subtract what you need to work well
The first number is always easy: count the chairs, the mats, the stations, the machines. That's your physical capacity, what fits if nobody ever had to move around or correct anyone's form.
The number you actually sell is almost never that one. It's the physical capacity minus whatever you need to deliver the service comfortably: room between mats so the instructor can walk through, enough of the staff's time to properly attend each spot, a cushion so a machine that breaks down doesn't cost you the spot you promised. We call that second number your real capacity, and it's the one you write down for each slot.
The temptation is to stick with the physical number because you already have it: you counted it once when you set up the business and never thought about it again. But real capacity changes with the service itself. A Pilates studio with Reformer machines needs more walking room than one with mats; a hair salon with two styling chairs and only one shampoo bowl has a bottleneck that no chair count will ever show.
- 1Count the physical units
Chairs at the table, mats that fit on the floor, stations or machines you have, staff working that shift. This is your starting point, not the final number. - 2Subtract your working margin
For a class, the space for the instructor to walk between spots and correct form. For a professional, the time to properly attend to each client without stacking appointments back to back. For a machine, one unit held in reserve if it breaks down often: in a room with four tanning booths, that reserve might be just one booth if maintenance happens weekly. - 3Set a different number for each type of slot
A table isn't counted the same way as a class, and a machine isn't counted the same way as a professional. Every type of slot gets its own number, even if they share the same time block. - 4Write it down where whoever confirms bookings can see it
The number shouldn't just live in your head: write it right next to that table, that class, or that machine, so whoever confirms bookings doesn't have to guess, and knows to stop confirming once that number's reached. Also check whether your booking site allows multiple bookings at the same time: if it only allows one, you'll have to take the rest of that class's or those booths' spots by hand, by phone or WhatsApp, and add them to that same list. Jot down the date you last checked it too, since the cushion you need today isn't necessarily the one you needed six months ago.
Table, professional, machine, class: they're not counted the same way
A table counts people, not bookings. A service provider almost always counts as a single slot, except when the service has its own built-in wait time, like a hair color that processes on its own or a manicure with dry time, in which case the same person can handle two appointments at once without either one waiting too long. A machine counts units: if you have three tanning booths, that time slot can serve three bookings at once, not one more no matter how big the room they're in is.
And a class is where most people get it wrong, because the room's legal occupancy isn't the same as class capacity. A lot of people can fit standing up, but far fewer when they're stretching with a mat on either side.
These four types can all coexist in the same time block without sharing a number: at six in the evening you might have a class with fourteen spots, two professionals working at the same time, and one open tanning booth, and each of those slots carries its own capacity, not one shared number for the whole place.
- You count what fits if nobody moves
- It's quick to calculate
- Works when the space itself is the service, like a pickleball court
- You count what fits while properly attending to each spot
- Requires subtracting space, time, or a margin for breakdowns
- Works for classes, professionals, and machines that need maintenance
Which one do I use: Use real capacity whenever a staff member or a work space is involved; use physical capacity only when the physical limit is the service itself, like a court or a room you rent out whole.
A Pilates class: what fits and what you sell
- Every table, staff member, machine, and class has its real capacity set and written down where whoever confirms bookings can see it.
- The starting number is what physically fits. The final number is that, minus the margin the professional needs to work well.
- Physical and real capacity match for a court or a room you rent out whole, and they diverge for a class, a professional with wait time built in, or a machine that breaks down.
- You revisit the number whenever the service, the space, or the equipment changes, not just the first time you set it.
- Up next: how long it takes a slot to free up again.
Three cases for deciding capacity
Answer before opening each one. If one gives you trouble, go back to the section that explains it.
1. You have a manicure station where the nail polish takes ten minutes to dry per customer, and the technician can do another client's makeup in the meantime. Does that count as one spot or two?
Two, because the drying wait lets you take care of another customer without either one waiting. If it were a haircut with no downtime, it would be a single spot.
2. Your yoga studio has a legal capacity of thirty people standing, but only eighteen mats fit with enough room to correct posture between them. How many spots do you sell?
Eighteen, the class's real capacity. The room's legal capacity isn't the class capacity when the service needs working room between spots.
3. You have three tanning booths and one of them breaks down once a month. Do you sell all three spots for every slot?
It depends on how often it happens. If the breakdown is rare, sell all three. If it starts happening often, hold back one as a margin and sell two, so you don't promise a spot that might not be there.
Once you've set the capacity for each slot, you still need to decide how much time to leave between one booking and the next so they don't overlap.
In Yodai your clients request a time on your site and you confirm it from your dashboard. See how online booking for your business works.
NextThe buffer that decides whether the next customer walks into a ready slot or one that's still being reset