Twenty-three hours a week,
times the tutors you can keep busy.
Count the hours families can actually attend: after school from about four to eight on weekdays, and a Saturday morning block. Around twenty-three hours a week. A one-to-one centre earns one session per tutor per hour inside that window and nothing outside it, so its revenue ceiling is those hours multiplied by the tutors it can keep busy in them, and the number does not move with better marketing. It moves with more tutors in the same hours — which means more rooms or more online capacity — or with more students per tutor-hour, which means groups.
Owners usually discover the ceiling by hitting it: the diary is full, the waiting list is growing, the tutors are tired, and the revenue has stopped rising. The response that works is not a second phone line. It is a second product in the scarce hours.
The same hour,
one student or five.
The arithmetic is simple and worth doing with your own figures. As an illustration with round numbers, take one after-school hour with one tutor, first as a one-to-one session and then as a group of five:
The group earns two and a half times the revenue and nearly five times the contribution from the same hour, the same room and the same tutor, and the family pays half as much per hour for a programme with a name and an outcome. It is booked once at enrolment rather than renegotiated twelve times, and an absence changes nothing for the class. None of this makes one-to-one wrong. It makes one-to-one the premium product, priced for what it is, and groups the core of the business.
The objection is always the same: parents want one-to-one. Some do, for specific needs, and they should have it at a premium price. Most ask for it because it is what they know, and switch happily to a small group when the group is for the same exam, in the same year, with a written programme and a mock at week eight, at a lower price. The result matters more than the format, and for most exam preparation a group of four to six produces better results than one-to-one, because explaining to a peer is learning and because a programme has a structure a session does not.
Three to six,
same exam, same year.
A group is not five strangers in a room. It is a set of students with the same goal at the same stage: the same exam in the same year, the same year group in the same subject, the same language level. Homogeneity is what makes the group teachable and what lets the tutor run a programme rather than five parallel sessions. The formats that work, with the numbers most centres land on:
Above six, speaking and marking time per student falls below the level that produces progress, and families notice before you do. Below three, the economics are barely better than one-to-one and the group dynamic does not form. Decide the minimum to run, the maximum, and the merge point before enrolment, as a language school does, and apply the rule rather than the hope.
Fixed slots, published before enrolment,
and defended.
A group is a slot: "higher-level maths, Tuesdays at six, twelve weeks from the 14th". It is the same slot next term whether or not the same students are in it, it is published before enrolment with the price and the tutor, and it does not move during the term because one family has a clash — the family chooses another slot or waits for next term. Everything the language-school timetable articles say about slots applies: name them by programme, spread the same programme across days so a clash has an alternative, keep a waiting list per slot, and read the lists at the end of term as a map of where the next group goes.
In the software, a group has to be a first-class thing — a class with a roster, a minimum and a maximum, a tutor and a slot — not five one-to-one bookings at the same time. The first article in this cluster makes that a requirement; on SprintUp a group is a class with a roster and, online, a single live link for the session, and each student sees it as their own class in the portal.
At renewal,
framed as progression.
Students do not move from one-to-one to a group in the middle of a package; they move at renewal, when the package runs out and the family is already talking to you about what comes next. The frame is progression, not economy: "She is ready for the exam-prep programme — it runs Tuesdays at six with four others in her year, it has a mock in week eight, and it costs less per session." The family hears a step up. The centre gains a filled slot and a freed one-to-one hour it can sell to the next family at the premium rate.
Two things make the move stick. The programme has to be real — a written sequence, a tutor who has taught it before, a mock, a report — because a family that moves from a good one-to-one tutor to a vague group will move back. And the first group should be seeded from your own one-to-one students rather than advertised cold, because five families who already trust you will fill a slot that strangers will not.
Groups as the core,
one-to-one as the premium.
The centres that scale run both, in a fixed proportion they chose. Group programmes fill the scarce evening slots and carry the business; one-to-one is kept for students with specific needs, for the fortnight before an exam, and for the families who want it and will pay a premium for it. The premium is not a penalty; it is the honest price of a tutor's whole hour, and stated that way, families understand it.
The scheduling consequence is that the timetable is planned groups-first, the way a language school plans levels-first: the programme slots go into the after-school grid before the term, and one-to-one is booked into what remains, against published tutor availability, under the cancellation policy in the previous article. A centre that plans the other way round — one-to-one first, groups in the gaps — never finds the gaps, because one-to-one expands to fill every hour it is offered.