Food Cost Percentage: Formula and How to Calculate It

Food cost percentage is the share of your food sales that went to buy the food you sold. The formula takes one week (or month) of purchases and stock counts, divides the cost by the sales, and multiplies by 100. Below: how to calculate food cost percentage for the whole kitchen and for a single dish, the range restaurants usually aim for, and what to do when your number comes out higher than the plan.

Once the counts are done, the arithmetic is quick. The counts are where most mistakes happen, so much of what follows is about getting honest inputs.

The food cost percentage formula

Escoffier School of Culinary Arts gives the standard version. In words:

Food cost percentage equals beginning inventory plus purchases minus ending inventory, divided by food sales for the same period, multiplied by 100.

• Beginning inventory is the value of the food on your shelves, in the walk-in and in the freezer at the start of the period. It is the ending inventory of the previous period, so you only count once per period.
• Purchases are every food delivery you received during the period, at invoice price. Credits for returned or short-shipped goods come off.
• Ending inventory is the value of the food left at the close of the period, counted the same way as the beginning.
• Food sales are what guests paid for food in the same period. Keep beverages out if you track them separately, and use sales before tax.

Beginning inventory plus purchases minus ending inventory gives your cost of goods sold for food: what actually left the shelves. That covers food that went onto plates, and also food that was thrown away, over-portioned, eaten by staff or stolen. The formula does not care where the food went, so it catches losses nobody recorded.

A worked example

Here is a week in an imaginary 60-seat bistro, with round numbers chosen to make the arithmetic easy to follow.

Cost of food used is 6,200 plus 8,400 minus 5,900, which is $8,700. Divide that by $27,500 in food sales and you get 0.316. Multiply by 100: the bistro ran a food cost of about 31.6% that week.

The count and the timing of invoices move the result most. On the count: if the Sunday count misses a case of short rib in the back freezer, the ending inventory is too low and the food cost looks worse than it was. On timing: an invoice that arrived on Sunday but was entered on Monday moves cost from one week into the next. Count at the same time every period, and enter invoices by delivery date.

Food cost per dish: plate cost

The kitchen-wide percentage tells you whether you have a problem. The per-dish number tells you where. Escoffier describes it as the total cost of the item divided by its menu price, multiplied by 100.

To get the total cost of an item you need a costed recipe: every ingredient, the quantity on the plate, and the price per unit from your latest invoice. Use the usable weight, not the purchased weight. A whole salmon you buy by the kilo loses head, bones and skin before it becomes portions, so the cost per usable gram is higher than the invoice suggests.

Say a burger uses a 170 g patty, a bun, cheese, sauce, pickles and a side of fries, and the costed recipe adds up to $4.10. On a $14 menu price, the plate cost percentage is 4.10 divided by 14, times 100, or about 29%.

Do this for your twenty best sellers first. They usually carry a large share of food sales, so a costing error there moves the total; an error on a dish that sells twice a week barely shows.

Ideal versus actual food cost

The sum of your plate costs, weighted by how many of each dish you sold, gives an ideal food cost: what the kitchen would have spent if every plate matched its recipe exactly. Escoffier's guide notes that this target assumes no waste, no theft and perfect portion control.

The inventory formula gives the actual food cost. Watch the gap between the two. In Escoffier's own example a pizza costed at 25% comes out at 30% in practice, and the school reads that gap as a sign that each pizza is costing more to make than planned.

Some gap is normal in any kitchen. A gap that keeps growing week after week usually points to one of a short list of causes:

• portions drifting larger, often on the line's busiest nights;
• waste from over-prepping or from stock that expires before it is used;
• a supplier price increase that never made it into the recipe costs;
• items given away (staff meals, comps, remakes) that nobody records;
• recipes that changed in the kitchen but not on paper;
• theft, which is the last explanation to check, not the first.

What is a good food cost percentage

Most published benchmarks land in the same band. MarginEdge writes that most restaurants keep their food costs around 28 to 35%, and TouchBistro's menu pricing guide puts the ideal food cost for most restaurants between 28 and 35%.

Treat that range as a starting point. Your concept matters more than the average. A pizzeria or a noodle bar built on cheap staples can run well under it. A steakhouse or a seafood restaurant whose menu is mostly protein can sit at the top of it or above, and can still be very profitable if prices and volume carry the cost. Compare your number with your own history and your own recipe targets first, and with the industry band second.

Food cost and prime cost

Food cost alone can mislead. A kitchen that buys pre-cut vegetables and par-baked bread pays more for food and less for labor. The number that captures both is prime cost.

Restaurant365 defines prime cost as cost of goods sold plus total labor costs, and says these two lines typically account for 55 to 65% of every dollar a restaurant brings in. It suggests aiming for 55 to 60% of total sales overall, and by concept gives 55 to 60% for quick-service and fast-casual and 60 to 65% for full-service restaurants. It also gives a warning sign worth remembering: a food cost of 35% next to labor of 23% probably points to a purchasing or waste problem, because the kitchen is paying for food it is not turning into sales.

On labor alone, the accounting firm BTCPA writes that most restaurants target a labor cost between 25 and 35% of sales, and that many operators aim to keep prime cost below 65%.

The 30/30/30 rule

CHEF'STORE, a restaurant supply retailer, describes it as a budgeting guideline sometimes called the 30/30/30/10 rule: roughly 30% of revenue to food, 30% to labor, 30% to overhead, and 10% left as profit.

It is a trade rule of thumb, with no official body behind it. It is useful as a quick sense check on a new concept. It is less useful as a target for a running restaurant, where the prime cost benchmarks above give a more precise picture.

How to set a menu price from a target food cost

The plate cost formula also runs in reverse. TouchBistro's guide describes it: divide the plate cost by your ideal food cost percentage. Its own example takes a plate cost of $2.728 and a target of 33% and arrives at a price of $8.26.

Using the burger from earlier, with a plate cost of $4.10 and a target of 30%, the price that hits the target is 4.10 divided by 0.30, or about $13.67. You would then round to a menu price that reads well, check it against what nearby restaurants charge for a similar burger, and decide whether the dish can carry a slightly higher margin to make room for one that cannot.

Not every dish has to hit the same percentage. A side of fries can run far below target and a dry-aged steak far above it. The target applies to the weighted total across what guests actually order.

How to lower food cost percentage without cutting quality

Once you know the gap between ideal and actual, the fixes are mostly practical:

1. Count on a fixed schedule. Same day, same time, same order of shelves. Weekly counts on high-value items (proteins, cheese, alcohol if you track it) catch problems a monthly count hides.
2. Update recipe costs when invoices change. A supplier increase on butter or oil touches dozens of dishes at once.
3. Weigh portions on the line. A scale at the protein station costs little and shows quickly whether the 170 g patty is really 190 g.
4. Record waste. A simple sheet by the bin, with item, quantity and reason, turns guesswork into a list you can act on.
5. Prep to forecast. Prep lists built from last week's sales of each dish leave less to throw away on Monday.
6. Engineer the menu. Push dishes with a good margin and steady demand, and rework or retire dishes that sell little and cost a lot.
7. Use the same ingredient in several dishes. Shared ingredients turn over faster, so less of them spoils.

Most of this depends on knowing how many of each dish you sold. When orders already go through a system with sales analytics, such as inite.food, that count comes from a report, and the only half you build by hand is the recipe costing.

Common mistakes in the calculation

• Mixing periods. Sales for the calendar month against counts taken on the 3rd of each month will never reconcile.
• Counting at retail price. Inventory is valued at what you paid, not at what you charge.
• Leaving out transfers. Food moved to the bar or to a second location has to come off the kitchen's cost, or the kitchen carries cost that the bar used.
• Including beverages in food sales. Mixing a high-margin drinks line into food sales makes the food cost look better than it is.
• Comparing with the wrong benchmark. A burger bar measured against a fine-dining range, or the other way round, leads to the wrong fix.

Summary

Food cost percentage comes from a stock count, a stack of invoices and a sales report: beginning inventory plus purchases minus ending inventory, divided by food sales, times 100. Calculate it on a fixed schedule, compare it with the ideal cost your recipes predict, and work on the gap. Published benchmarks put most restaurants between 28 and 35%, with prime cost between 55 and 65% of sales, but your concept and your own trend tell you more than any average.