Capacity utilisation: how full is full?

Ask a manager how full the room was on Saturday and the answer is usually "packed". At eight o'clock it was: every table taken, a queue at the bar, the kitchen at full stretch. But the same room was half empty at six, had gaps between seatings all evening and emptied steadily after ten. Across the whole service, it may have been well under two thirds used.

Capacity utilisation measures that difference. It compares the seat time the room actually sold with the seat time it had available, across the whole service, rather than at its busiest moment. It is one of the most useful numbers a dining room can know, because it shows how much room there is to grow before anything needs to be built, hired or rearranged.

This guide covers what capacity utilisation measures, how to work it out, why full is never 100%, what a sensible ceiling looks like and how to raise the figure without crowding anyone. Every venue and figure in it is an example.

Capacity utilisation measures the share of the room's available capacity that was used. In a restaurant, capacity is seats over time: each seat, for each hour of service. A room with sixty seats open for five hours has three hundred seat hours, and the figure shows how many of them were used by guests.

It is different from covers. Covers count guests; utilisation counts the time and seats they used against what was available. Two nights with the same covers can have very different utilisation, depending on how long guests stayed and how well the tables fitted the parties.

Full is a feeling, usually taken from the busiest half hour of the night. It ignores the hours either side, the gaps between seatings and the empty seats at tables that look taken. A room can feel full for ninety minutes and still sell barely half of what it had to offer across the evening.

That gap between feeling and figure is the most important thing utilisation shows. A venue that believes it is full looks for a bigger room or a second site. A venue that knows it is two thirds used looks first for ways to sell the third it already has.

Utilisation can be counted by seat or by table. Table utilisation asks how much of each table's available time was booked or seated. Seat utilisation goes further, asking how many of each table's seats were used during that time.

Both matter. A table for four seating a couple is fully used as a table and half used as seats. Table utilisation shows how well the diary fills the tables; seat utilisation shows how well the tables fit the parties. Most venues start with tables, which are easier to count, and look at seats when the tables are well used.

The idea of capacity utilisation comes from economics, where it compares what a factory produces with what it could produce. In a dining room, divide the seat hours used by the seat hours available. If sixty seats are open for five hours, that is three hundred seat hours. If guests used 180 of them, utilisation is sixty per cent.

Seat hours used come from the bookings and walk-ins: each party's size multiplied by the time it spent at the table. Seat hours available come from the seats the room could sell and the hours it was open for seating. Use the same rule every week, so the changes in the figure are real.

An invented bistro has fifty seats and seats guests from six until ten, with the last tables finishing by eleven. Call it five hours, so 250 seat hours. On a busy Saturday it serves 110 covers, and each stays about an hour and a half, which uses 165 seat hours. Capacity utilisation is 66 per cent.

On the Tuesday, it serves 45 covers for about the same time each, using 68 seat hours, which is 27 per cent. The Saturday felt full and the Tuesday felt quiet, and both feelings were right, but the Saturday still left a third of the room's seat time unsold.

The early and late hours pull utilisation down in almost every room. Few guests want to eat at six or start dinner at ten, so those hours are usually lightly used even on the busiest nights. They are counted because the room is open and staffed, and they are where most of the unused capacity sits.

That is why utilisation should be measured hour by hour as well as for the whole service. An hour-by-hour view shows the peak at its true height and the shoulders at their true depth, and it shows where an early menu or a late offer would add the most.

Every couple at a table for four leaves half the table's seats unused for the length of their meal. On a full night, those empty seats can be a large share of the room, and seat utilisation falls well below table utilisation as a result.

Matching parties to tables of the right size raises seat utilisation without adding a single booking. Hold fours for fours where the diary allows, combine twos when a larger party books, and look at whether the mix of tables in the room matches the party sizes that actually come.

Covers per table, the number of guests each table serves in a service, joins the two views together. A table for four that serves two couples in an evening has served four covers; one that serves a four and then another four has served eight.

Look at it table by table over a month. Tables with low covers per table for their size are either too large for the parties they get, in a spot guests avoid or held too long between seatings. Each has a different answer, and the figure shows where to look.

No dining room reaches 100% utilisation, and none should try. Guests arrive in parties that do not fit tables perfectly, they want to eat at similar times, tables need clearing and resetting between seatings, and some seats are always waiting for the next party.

A room pushed towards 100% would mean guests seated at tables the wrong size, short gaps that rush the reset, a crowded room and a kitchen at its limit all evening. The aim is not a full room every minute, but a room used well at the times guests want to come.

The ceiling depends on the room's table mix, its turn times and its guests. A room of flexible twos that can be pushed together, serving quick meals, can reach a higher figure than a room of fixed rounds serving long dinners. A room that seats guests from five until eleven has more shoulder hours to fill than one that seats them from seven to nine.

Find your own ceiling from your busiest nights. The best Saturday of the year shows roughly what the room can do when demand is strong. Most nights will fall below it, and the gap between each night and that ceiling is the opportunity.

Measured hour by hour, utilisation usually shows a steep curve: low at opening, rising to a peak around eight, then falling. The peak hour may be close to the ceiling, while the hours either side are far below it.

This is the most useful view for decisions. A peak close to the ceiling needs precise use, with tables matched to parties and resets done quickly. Shoulders far below it need guests, through early menus, invitations and offers that suit those hours.

Day by day, utilisation shows the shape of the week. Most venues find the weekend nights several times fuller than the early-week ones, and lunch less used than dinner. A few find a strong midweek night that the rest of the week could learn from.

Use the daily view to decide where effort goes. A rise of a few points on the quietest nights can be worth more over a year than squeezing the busiest ones, because there is far more unused capacity in the quiet nights to work with.

Utilisation also differs across the room. Tables by the window are usually used more than tables by the kitchen door; a terrace is used more on warm evenings; a private area may sit empty most nights.

Looking at each table and zone shows where the room's weak spots are. A zone that is rarely used may need better tables, better lighting or a different purpose. A table that is rarely booked may be in the wrong place or the wrong size for the parties that come.

Booking capacity is how many covers the diary should accept for each time, leaving room for walk-ins, the kitchen's pace and the next seating. It is the practical lever that most affects utilisation: set it too low and the room sits partly empty, too high and the kitchen and floor are overwhelmed.

Setting it well depends on the venue's walk-ins, kitchen and turn times. Our guide to booking capacity: how full should the diary be? covers how to find the right level for each service.

Walk-ins use capacity too, and in many venues they fill a large share of the room. A diary that books every seat at the peak leaves no room for them, while one that holds too much back can leave tables empty if they do not come.

Watch how many walk-ins arrive at each hour over a few weeks, and leave roughly that much room in the diary. Count walk-ins in utilisation as well as bookings, so the figure reflects the whole room rather than only the booked part of it.

The room is not the only limit. A kitchen can cook only so many covers in an hour, and a room that seats faster than the kitchen can cook will have full tables waiting for food. In some venues, the kitchen's capacity at the peak is lower than the room's.

When it is, raising room utilisation at the peak will not help. The gains are at the shoulders, where the kitchen has spare capacity, and in spreading bookings so the kitchen receives orders at a steady pace rather than all at once.

The floor team has a limit too. A server can look after only so many tables well at once, and a room that fills faster than the team can greet, take orders and clear will feel slow even if the kitchen keeps up.

Match the team to the expected covers in each hour. A room that is well used with a stretched team loses guests through slow service; a room that is well used with the right team earns well and keeps them.

Utilisation is one half of RevPASH, revenue per available seat hour. The other half is what guests spend for each seat hour they use. Multiply the two and you get RevPASH: a room that is well used and where guests spend well earns the most from its capacity.

Watching both shows what to work on. If utilisation is low, the room needs more guests at quieter times. If it is high but spend is low, the menu and service need attention. Our guide to RevPASH: revenue per available seat hour covers the full figure.

The break even point, the covers needed to cover all costs in a period, can be set against utilisation. A venue that needs 600 covers a week to break even, and whose room can serve 1,500 at its ceiling, has room to spare. One that needs 1,200 is running close to the limit of what the room can do.

When the break even point creeps towards the room's ceiling, small dips in trade become dangerous. Our guide to break even point: the covers you need by Tuesday covers how to work it out.

At the peak, raise utilisation through precision rather than more bookings. Set booking lengths from real turn times, match parties to tables of the right size, reset tables quickly and offer an earlier or later time when the busiest one is full.

Avoid squeezing more tables into the room or shortening meals. Both raise the figure for a few weeks and lower it later, as guests who felt crowded or hurried choose somewhere else.

In the quiet hours, raise utilisation by giving guests a reason to come. An early evening menu, a set lunch, an invitation to regulars, a midweek event or a supper club each fill seats that would otherwise earn nothing.

These hours have the most capacity to gain, and every guest in them adds revenue from a room, kitchen and team already paid for. Our guide to revenue management for a dining room sets the quiet hours alongside the peak in a wider plan.

A room that is too full stops being pleasant. Tables too close together, noise that rises with every party, servers who cannot reach every table and a kitchen that falls behind all lower the guest's evening, even as the figure rises.

Watch guest feedback alongside utilisation. If complaints about noise, waiting or being hurried rise as the room fills, the venue has found its practical ceiling, and the next gains will come from the quieter hours rather than the peak.

Utilisation can be measured with a booking diary and a calculator. For one service, add up each party's size multiplied by the time it spent at the table, and divide by the seats multiplied by the hours open. Do it for a few typical services, and the pattern usually becomes clear.

It does not need to be precise. A rough figure, worked out the same way each month, is enough to show where the room is under-used and whether a change has helped.

In a group, utilisation lets venues of different sizes be compared fairly, because it is already a share of each room's capacity. A small venue and a large one can be set side by side to see which is selling more of what it has.

Compare like with like, though. A busy city site and a quiet neighbourhood one serve different demand, and each is best compared against itself over time. The group view is most useful for spotting a venue whose utilisation is falling while the others hold steady.

An invented brasserie with eighty seats believes it is full every weekend and starts looking for a second site. The manager works out utilisation by hour for a month of dinners. The peak hour on Fridays and Saturdays is close to the room's ceiling, but the whole service is about sixty per cent used, and the hours before seven and after half past nine are under a third.

Instead of a second site, the brasserie offers an early evening menu, sets booking lengths from its real turn times and offers half past six or a quarter past nine when eight is full. Within three months, the weekend serves noticeably more covers without anyone feeling rushed, and the search for a second site is put off for a year.

servearound's table analytics show utilisation for each table, each zone and the room: the time each table had a party divided by the service time the venue's shifts make available, capped at 100%. That time comes from the stays, from seating a party to its leaving, where tables are seated in servearound, and from the bookings' lengths where they are not, so it measures time at tables rather than guests in seats, and it needs the venue's shifts set up. The page also shows unsold service minutes per table, the median seating, the gap between seatings, a floor plan shaded by utilisation and a heatmap of when the room fills.

Booking rules set the times offered for each shift, a single booking duration, the largest party and the notice needed, and each table can be bookable online or not, for its own range of party sizes, days and hours. There is no automatic cap on covers per time slot, so the diary's pace is set by the times you offer. Reservation analytics add covers by day and hour and by party size. See Analytics and the reservations module.

The share of the room's seat hours that guests used, across a whole service.

Divide the seat hours used by guests by the seats multiplied by the hours open.

It depends on the room. Use your best night of the year as the ceiling and measure the gap to it.

No. Parties never fit tables perfectly, and a room pushed that far feels crowded and rushed.

No. Covers count guests; utilisation counts the seats and time they used against what was available.

In the early and late hours, the quiet nights and the seats left empty at tables too large for the party.

Yes. They use the room as much as bookings do.

Monthly, by service and by hour, compared with the same month last year.

Capacity utilisation shows how full a dining room really is: the seat hours guests used, divided by the seat hours available, across the whole service. A room that feels packed at eight is often well under two thirds used across the evening, with the unused capacity in the early and late hours, the quiet nights and the empty seats at tables too large for their party.

Never aim for 100%. Find your own ceiling from your best nights, measure each service against it and raise the figure with precise booking capacity, tables matched to parties and reasons to come at quiet times. Read it with RevPASH, covers per table and the break even point, and sell the room you have before looking for a bigger one.