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One slot for one person, one slot for multiple spots
You'll walk away knowing which slots on your calendar hold a single booking and which ones allow multiple spots, with that decision written down so you can apply it when confirming each booking and avoid double-booking two people at once.
By Yodai · Published on September 6, 2026 · Updated on October 12, 2026
Say you have a hairstylist who cuts one person's hair at a time, at 5:00 pm. And you have a pilates class at 6:00 pm, on the same calendar, with room for twelve people in that very same hour. If you treat both bookings the same way, something breaks: either the class closes the moment the first booking comes in and eleven chairs sit empty all evening, or the haircut slot accepts a second booking at the same time, and a customer shows up at the door with no chair to sit in.
The problem doesn't start with which calendar you use. There are two very different kinds of slots, and if you don't tell them apart before you turn on online booking, you're treating them as if they were the same thing.
Two kinds of slots, two different rules
An individual slot is one that's filled by a single booking and closes the moment someone takes it. A haircut, a visit to the podiatrist, a table for a family dinner, a half-hour van rental: as soon as you confirm one booking, that time block is taken for any other customer.
A capacity slot is one that allows several independent bookings in the same time block, each one drawing from the same pool of spots. A yoga class, a pottery workshop, a screening, a guided tour: the first booking doesn't close anything, it just uses up one spot out of however many are available. That's the same math Google asks for in the format booking systems use to send Google their availability: every slot carries its total spots and however many are still open. In Google's own example, a ten-spot yoga class with three booked has seven open, and a massage that's already booked has one spot and none open.
What separates an individual slot from a capacity slot is who's providing the service during that time block. If it's a person, a table, or a machine that can only handle one customer after another, the slot is individual. If it's a space or a class where several people fit without getting in each other's way, the slot is a capacity slot.
A CrossFit box has a class with fifteen spots at 7:00 am and, half an hour later, a one-on-one session with the trainer. A dental clinic has the chair as an individual slot all morning and, on Tuesday afternoons, an information session about orthodontics that seats twenty people. A tattoo studio only has room for one customer per artist at a time; a surf school takes eight students out at the same time with the same instructor in the water.
- One booking fills the entire time block
- It closes as soon as you confirm the first booking
- It's provided by a single person, table, or machine at a time
- Examples: a haircut, a consultation, a table
- Several bookings share the same time block
- It stays open until you've confirmed as many bookings as it has spots
- The space or class fits several customers without them getting in each other's way
- Examples: a group class, a workshop, a movie screening
Which one do I pick: If whoever handles the slot can only take one customer at a time, mark it as individual: once one booking is confirmed, it's full. If the slot is a space or a class where several people fit without getting in each other's way, mark it as capacity, with however many spots it has: that number is what the next lesson will cover.
When someone books by phone, you decide on the spot whether there's room. When the booking comes in through your website or WhatsApp, you decide it the same way, right when you confirm it: you check what type of slot it is and how many bookings you've already confirmed for that time. So you don't have to think it through every time, and so two people on your team don't decide it differently, write the decision down before you turn on online booking: a list of every slot and its spots, to check before confirming each booking.
You don't decide this once for the whole business. You decide it slot by slot. A spa might have the massage as an individual slot at ten in the morning and the group manicure session as a capacity slot at five in the afternoon, same day, same calendar. A restaurant might have its tables as individual slots and, that same night, a wine tasting with twelve open spots. Both types coexist just fine on the same calendar, as long as you've noted how many spots each slot has. At a restaurant, the number of tables matters too: each table is an individual slot, but you have several at the same time, so you can take as many bookings at once as you have tables. That number is worth locking into your online booking, so you don't let in more bookings than you can seat.
- 1Look at who handles that time block
Ask yourself whether whoever provides the service in that slot, a person, a table, a machine, can serve more than one customer at once. - 2If the answer is no, it's individual
Log it with a single spot. As soon as you confirm one booking for that time, offer any other request for the same time a different slot. - 3If the answer is yes, it's capacity
Log how many spots fit and keep confirming bookings until you reach that number; each booking you confirm uses up one spot, it doesn't close the whole slot. - 4Review slot by slot, not the whole calendar at once
The same business can mix both types on the same day; log them one by one before one customer runs into another at the door.
Now you have the rule of thumb to look at your whole calendar and say, slot by slot, whether it holds one spot or several. Log the clear ones first, the table, the haircut, the group class, and save the ones you're unsure about for last.
The next lesson gets into the exact number: how many spots fit in each of the slots you just logged as capacity.
- You have it written down which slots on your calendar are individual and which are capacity, with their spots
- You know how to decide: who provides the service and how many people they can serve at once
- Before confirming each booking, you check that list and how many bookings you already have for that time
Test yourself
Answer before opening each one. If one gives you trouble, go back to the section that explains it.
1. A physical therapist works solo, but has two stationary bikes set up in the same room that two customers can use at the same time without getting in each other's way. How should the two appointments be logged?
The physical therapy session is individual, because only one customer can be seen at a time. The bike slot is capacity with two spots, because the space fits both without them getting in each other's way.
2. An auto shop has a lift that can only raise one vehicle at a time, but books appointments two at a time to fill up the calendar faster. What happens if it keeps both bookings in the same slot?
The slot is individual because it's covered by a single machine that can't handle two cars at once. If it's left as capacity, two cars show up at the same time and one is left waiting in the street: it needs to be treated as a single spot, don't confirm two bookings for the same time, and space out the appointments.
3. A language school opens a conversation class with a capacity of eight spots, but decides that if fewer than three students sign up, they'll teach it anyway as if it were a one-on-one tutoring session. Is it still a capacity slot?
It's still a capacity slot as long as the teacher can handle all eight people at once without anyone getting in anyone else's way; what changes is how many spots get filled, not the type of slot. It would only become an individual slot if the teacher decides, separately, to open a tutoring slot elsewhere on the calendar.
You can already tell a one-spot slot from a multi-spot one; what you haven't decided yet is how many spots each of the multi-spot ones can comfortably handle, and that number, the one you're going to log on your list, is your next decision.
Sources
- Availability feed. Google for Developers, Google Actions Center documentation (Reservations End-to-End), updated April 1, 2026.
- Check your own availability across multiple calendars. Google Calendar Help, Google, accessed October 2026.
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