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Whether to keep a half-full slot running, or not
By the end, you'll have written down, for every slot with a fixed cost, a minimum headcount and a cutoff time that tell you whether the slot stays, gets merged, or gets canceled.
By Yodai · Published on September 6, 2026 · Updated on October 12, 2026
It's three hours before the six o'clock class and only two people are signed up. Max capacity is twelve, but twelve isn't today's question. The real question is this: with two people paying, do you cover the cost of a full hour of instructor time?
Do you teach the class anyway, even though those two spots don't cover the cost? Do you call those two people and move them to the eight o'clock class, which does have room? Or do you cancel and refund the money? All three are valid at different times of the year. What's missing isn't knowing they exist, it's knowing which one applies today, with the clock working against you and no decision made ahead of time.
The minimum isn't just the maximum in reverse
A slot's capacity is how many people fit. The minimum headcount is something else: how many you need filled for it to be worth running. It's not a number you guess on class day. You set it once, by slot type, and write it down next to the maximum.
A yoga class with an instructor at $40 an hour and spots at $12 each needs four people to cover the cost: with three, that's only $36. Below four, the class costs you money instead of making you money. A bike tour guide who charges $40 per outing, with spots at $10, also needs four. A restaurant table, on the other hand, has no minimum: one person alone pays for their own meal, and there's no fixed cost beyond the table itself.
A minimum shows up wherever there's a fixed cost to running the slot, no matter who shows up: an instructor hired by the hour, a van that goes out the same whether it's carrying two or eight, a guide you pay for the whole outing even if only one customer comes. If your business doesn't have that fixed cost, this lesson doesn't apply to you: skip it and stick with max capacity.
Decide ahead of time, not with the clock ticking
The mistake isn't teaching a class with only a few people once in a while. The mistake is not deciding ahead of time when you count the spots and what you do if you don't hit the minimum. Without that, every slow slot turns into a negotiation with yourself, different every Tuesday and every Thursday.
Set a cutoff time: the moment you count how many spots are filled and make the call, just once. Write it down next to the minimum headcount. For a six o'clock class, the cutoff might be 3:00 p.m.: that leaves enough time to notify anyone signed up if something needs to change, and it's not so early that it shuts out a last-minute booking that would have hit the minimum anyway.
Before the cutoff time, you don't check the slot, even if you're tempted to count spots every half hour. After it, the decision is made and doesn't get revisited, even if a last-minute booking comes in: that new booking gets placed in whichever slot is actually running; it doesn't reopen the one that's already closed.
- 1Count the filled spots
You check the slot only at that set moment, not before and not after. - 2Compare against the minimum
If you meet or beat the minimum, the slot runs as scheduled, even if it isn't full. - 3Look for a nearby slot
If you don't hit the minimum, check whether there's another slot of the same type nearby in time with room open. - 4Offer the switch, not the cancellation
For anyone already signed up, move their booking to the slot that is running; don't just hand back their money. - 5Cancel only if there's nowhere to combine
If no nearby slot exists, cancel right then and let people know, not a few hours later.
Combine before you cancel
Usually you merge two slots to fit a large group that doesn't fit in one. Here the reason is the opposite: you don't have too many people, you have too few. The move looks the same, shifting bookings from one slot to another, but the signal that triggers it is the opposite one, and it's worth not confusing the two when you're making the call.
Combining only works if there's another slot of the same type nearby in time with room open. A nine o'clock Pilates class doesn't combine with a ten o'clock spin class: they're different products, even if both have room that morning.
- The customer keeps their booking, only the time changes
- The remaining slot meets or beats the minimum
- Requires another slot of the same type nearby in time
- Costs you a call or a message, not a refund
- You refund the money, or call off the whole commitment
- The customer loses their spot and decides whether to try again
Which one to pick: Merge whenever there's a nearby slot with room: it costs you one phone call and you keep the sale. Cancel only when merging would mean moving the customer to a time that doesn't work for them; in that case, it's more honest to cancel than to offer a change they won't accept.
With the minimum and cutoff time written down, there's no more negotiating with yourself every afternoon: the slot stays, gets merged, or gets canceled according to the rule you set once, not one you reinvent every time. What's left to fine-tune is matching that minimum number to what actually happens on your calendar, not to what you imagined the day you created the slot.
- A minimum capacity set for every type of slot with a fixed cost, not just the maximum
- A specific cutoff time when you count spots and decide, once and for all
- A decision order: keep the slot if you hit the minimum, combine if you don't, cancel only if there's nowhere to combine
- A change message already written for when it's time to combine a slot
Test yourself
Answer before opening each one. If one gives you trouble, go back to the section that explains it.
1. A 7:00 PM spin class has a minimum set at 5. At the cutoff time, 4:00 PM, there are 3 people signed up. At 6:30 PM, a fourth booking comes in. Does the 7:00 PM class run?
You don't revisit it after the cutoff time: with 3 people at 4:00 PM, the call to combine or cancel was already made. The 6:30 PM booking goes into whichever slot the class was moved to; it doesn't reopen the 7:00 PM one.
2. A bike tour guide charges $40 per outing and needs the minimum to cover it. At the cutoff time, there are 2 people signed up for the 10:00 AM outing, and there's another outing at 12:00 PM with the same guide with 3 open spots. What do you do?
Merge them: move both people from 10:00 AM to 12:00 PM. There's a nearby slot of the same type with room, so merging only costs one message and keeps the sale. Canceling here would mean throwing away money for no reason.
3. A Saturday pilates class at 9:00 AM, with a minimum set at 4. At the cutoff time, there's 1 person signed up, and there's no other pilates class scheduled that Saturday.
Cancel right then and let people know. There's no nearby slot of the same type to merge into, so offering a switch isn't a real option. Waiting longer only delays a notice you already have to give.
The minimum headcount and cutoff time you just set aren't final: in the last lesson, you'll adjust them based on what actually happened on your calendar, not the number from day one.
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NextThe capacity you correct based on what actually happened, not what you expected