A waste audit you can run in a single service

Most kitchens have a rough idea of what they throw away and a poor idea of how much. A waste audit replaces the rough idea with a number. For one service, everything that leaves the kitchen as food waste is collected, sorted and weighed: what went off in the fridge, what was trimmed and over-prepared, and what came back on plates. At the end, you know exactly how much was wasted, of what, and why.

It sounds like a large job. It is not. With a few labelled bins, a scale and a briefing before service, a waste audit takes very little extra effort during the shift and about an hour afterwards. It is one of the most revealing exercises a kitchen can run, because it measures what actually happens, not what the team believes happens.

This guide sets out how to run a waste audit in a single service: choosing the service, setting up the bins, briefing the team, weighing and recording, and turning the result into a short list of changes. Every figure in it is an example.

A waste audit is a one-off, complete measurement of food waste over a set period, sorted by type. It differs from a waste log in two ways. It captures everything, including the quick scrape into the bin that a log often misses. And it is done deliberately, for a defined period, with the team briefed and the bins prepared, rather than as an everyday habit.

A waste log is the everyday tool; the audit is the check. Our guide to starting a waste log your team will actually fill in covers the log. Run an audit when you want a true baseline, when you are about to make changes and want to measure them, or when the log suggests a problem it cannot explain.

Pick one full service that is typical of your trade: a normal dinner service, or lunch if lunch is your main business. Avoid the quietest night, which understates waste, and a special event, which distorts it.

Include the whole service, from the start of prep to the last plate cleared, plus the morning fridge check if spoilage is thrown away then. Waste happens at all of those points, and an audit that starts at the first order misses the prep and spoilage altogether.

If you can, repeat the audit on a second, different service, such as a weekday lunch and a Saturday dinner. The two together give a more reliable picture than one alone.

Sort waste into three categories, each with its own clearly labelled bin or container.

Add a fourth container for inedible parts, such as bones, shells, coffee grounds and eggshells. These are not avoidable waste, but weighing them separately keeps them out of the figures you want to reduce.

Use containers you can lift onto a scale, and line them if that helps. Put the prep and spoilage containers in the kitchen, and the plate waste container where plates are scraped.

The equipment is simple:

For plate waste, a second scale near the dish area makes weighing easier during a busy service.

The audit only works if everyone knows what is happening and why. Before the service, take a few minutes to explain:

Ask the floor team to help with plate waste: plates come back to the dish area as usual, and whoever scrapes them sorts the food into the plate waste container and anything inedible into its own.

Keep the routine light. The aim is to change nothing about how the kitchen works except where the waste goes.

Resist the temptation to make the kitchen waste less during the audit. A kitchen that is unusually careful because it knows it is being measured gives a figure that is too low to be useful.

Weights alone tell you how much. To know what to change, you need to know what. Each time a container is weighed, write down the two or three items that make up most of it: "mostly chips and side salad", "lamb trim and onion peel", "lettuce and herbs past date".

For plate waste, note what was left: whole sides, half portions of mains, bread, garnishes. This is often the most revealing part of the whole audit, because it shows what guests do not want, and the kitchen rarely sees it in one place.

When the service is over, total the weights for each category, and list the main items in each. A simple summary is enough:

Then put a rough cost on the avoidable categories, using the cost per kilogram of the main items, plus an allowance for labour in prepared and plated food. Our guide to how much restaurant food waste really costs explains how to build those costs.

An invented Saturday dinner service for 140 covers produces:

The avoidable total is 20.3 kilograms, about 145 grams per cover. At example costs, the plate waste is the largest part of the value, followed by the over-prepared potatoes. The audit points to three clear changes: make the side salad optional, set potato prep from the bookings, and look at whether the fish garnish needs to be there at all.

An audit should end with a short list of changes, not a report. Three is a good number: enough to make a difference, few enough to actually do.

Choose them by weighing cost against effort. A change that saves a lot and is easy to make, such as making a side optional or reducing a bread basket, comes first. A change that saves a lot but takes work, such as rewriting prep lists, comes next. Small savings that need large changes can wait.

Give each change an owner and a date. "Side salad optional from next week, head chef to update menu and brief floor" is a change. "Reduce plate waste" is not.

In many kitchens, the largest avoidable part of prep waste is over-production: prepared food made to habit rather than to demand, which does not keep until the next service. It is also one of the easiest to fix, because the kitchen controls it completely.

The audit shows which prepared items are over-produced and by how much. The fix is to set those quantities from the bookings and recent sales, rather than from yesterday's list. Our guides to prepping from forecast and to the prep list that ends the morning guesswork cover how.

Trim is different. Some is unavoidable. Some can be reduced with better technique or a better specification from the supplier, and some can be used: vegetable trim in stocks and staff meals, fish trim in a fishcake or a soup.

Plate waste is the category kitchens most often overlook, because it happens out of sight, in the dining room and at the dish area. The audit brings it into the kitchen, and what it shows is usually specific.

Each is a decision about the menu or the portion, not about the kitchen's discipline. Changing it often saves more food and money than any amount of care in the kitchen.

Spoilage in an audit is usually small by weight and revealing in content. The items that go off tell you what is being over-ordered or badly stored: salad leaves and herbs bought in quantities the kitchen cannot use in time, dairy close to its date at the back of the fridge, bread bought for a busier day than the one that came.

The fixes are in ordering and storage: smaller, more frequent orders for the most perishable items, par levels set from actual use, and rotation that puts the oldest stock at the front. Our guide to par levels covers the ordering side.

Plate waste is collected at the dish area, but it is created at the table, and the floor team sees what the kitchen does not. Ask servers, during and after the audit service, what guests said about the dishes that came back: too much, not what they expected, too salty, arrived cold, the side they did not order.

Those comments turn a weight into a reason. A side salad left untouched because guests did not realise it came with the dish is a menu description problem. One left because it was limp is a kitchen problem. The container alone cannot tell the difference; the people who carried the plates can.

A single service is the quickest audit to run, but some waste only shows across a whole day. Breakfast and lunch trades produce different waste from dinner, and much spoilage is thrown away during the morning fridge check, before any service begins.

If your venue trades all day, consider extending the audit from opening to close, with the same containers and the same recording sheet, and the totals split by service. It takes more coordination but gives a fuller picture, and it often shows that one service produces most of the avoidable waste. That is exactly where the first changes should go.

There is no target figure that holds for every kitchen, and borrowing one would defeat the purpose. A good result from a first audit is not a low number but a clear one: a total per cover, a split between the three categories, a short list of the items that matter, and three changes with owners.

A good result from a second audit is a lower total per cover, with the change visible in the categories you worked on. If the second audit shows no change, look at whether the changes were actually made and kept, before concluding that they did not work.

The first audit sets a baseline. A second, a month or so after the changes, shows whether they worked. Run it on a comparable service, with the same containers and the same method, and compare the totals by category and per cover.

After that, an audit once or twice a year, plus the everyday waste log, is enough to keep food waste tracking honest. If the log and the audit tell very different stories, the log is missing something, and it is worth finding out what.

Separating food waste for an audit is good practice anyway, and in some places it is also required. In England, workplace recycling rules changed on 31 March 2025, requiring businesses to separate food waste for collection, with micro-firms of fewer than ten full-time equivalent employees given until 31 March 2027. The government's guidance on simpler recycling in workplaces sets out the details. Elsewhere, check the rules where you trade. A kitchen that already separates its food waste will find the audit easier to run.

The audit itself, the containers, the weights and the notes, happens in the kitchen and on your own sheet: servearound does not record waste. Two parts of servearound help you act on what the audit finds.

The menu report in Analytics shows units sold for every dish and side over any range of dates, so you can see how often a side that comes back untouched is actually ordered, and whether making it optional changes what guests choose. Kitchen analytics show a remake rate and flag tickets that were fired again, so the remakes that end up in the plate waste container appear as a number too. If you would like to see it, get in touch.

A one-off, complete measurement of food waste over a set period, such as one service, sorted into categories and weighed, to show exactly how much is wasted, of what and why.

The weighing adds a few minutes during the service, and adding up the results and choosing changes takes about an hour afterwards.

Spoilage, prep waste and plate waste, plus a separate container for inedible parts such as bones and coffee grounds.

Prep waste is thrown away in the kitchen before food is served: trim, failed batches and over-produced food. Plate waste comes back from the dining room or never reaches it: unfinished plates, returns, drops and remakes.

Once to set a baseline, again a month or so after making changes, and then once or twice a year alongside an everyday waste log.

Yes. Brief them before the service, explain the containers, and make clear it is about the kitchen's waste, not anyone's mistakes. Ask them to work exactly as they normally would.

Choose three changes, weighing the money each would save against the effort it needs, and give each an owner and a date. Then measure again.

Partly. Remakes and wrong orders are, but much plate waste is a menu decision: portion sizes, automatic sides, bread baskets and garnishes guests do not eat.

Keep the sorting to the three containers and one for inedible parts, put them exactly where waste is produced, and let one person do the weighing. Sorting takes no longer than throwing waste in a single bin once the containers are in the right places.

Include it if the bar is part of the audit, in its own container or by volume on the sheet: wine poured away, remade drinks, spilled drinks and garnishes. Keep it separate from the kitchen's figures so each can be acted on.

Yes, in specific items and money: what was thrown away most, what it cost and what will change. A team that sees the result understands why the changes matter and helps them stick.

Yes, with smaller containers and a kitchen scale. The categories and the method are the same at any size.

A waste audit weighs everything thrown away for one typical service, sorted into spoilage, prep waste and plate waste, with inedible parts kept apart. Set up labelled containers and a scale, brief the team, run the service as normal, and record the weight and main items each time a container is emptied.

Afterwards, total and roughly cost each category, then choose three changes with owners and dates: often making a side optional, setting prep from bookings and fixing what spoils in the fridge. Measure again a month later, then keep the everyday waste log going, with an audit once or twice a year to check what the log misses.