How to Calculate Food Cost Percentage: The Formula, a Worked Month and a Worked Dish

Recipe food cost and period food cost answer different questions. The period formula is the one on your P&L: what the kitchen actually used, from counts and invoices. The recipe formula is theoretical: what one plate should cost when the recipe is followed. You need both, and the gap between them is where money leaves without a sale.

The food cost formula, step by step

1. 1.Pick the period and keep it. A week or a month, counted at the same point each time — for example after close on the last day, before the next delivery — so every period covers the same trading days.
2. 2.Take beginning inventory. It is last period's ending count, not a new count. Value it at cost, what you paid, never at menu price.
3. 3.Add the period's food purchases. Every food invoice for goods received in the period, less returns and supplier credits. Keep alcohol, paper and cleaning supplies out.
4. 4.Count ending inventory. Count everything on hand at the end of the period and value it at cost. The inventory count guide has the count sheet and the procedure.
5. 5.Subtract to get food used. Beginning inventory plus purchases minus ending inventory is the cost of food used — your food COGS for the period.
6. 6.Divide by food sales for the same dates. Use food sales after discounts and without sales tax, then multiply by 100.

Purchases alone would have said 30.4% ($31,600 ÷ $104,000). The café used $500 more food than it bought, drawing its shelves down, so the real figure is higher. The reverse happens when a kitchen stocks up before a holiday. That is why dividing a week's invoices by a week's sales does not tell you what the week's food cost was.

Monthly matches your P&L and needs one full count a month. Weekly shows a problem three weeks sooner but needs a count every week. A workable middle is to count the high-value categories — proteins, dairy, anything you would miss — every week and everything once a month.

Food cost percentage for one dish

At a $15.00 menu price, $4.20 ÷ $15.00 × 100 = 28.0%. The other $10.80, or 72% of the price, is what the dish contributes toward labor, rent and profit.

Cost each line from what you paid and how much goes on the plate. If an ingredient is trimmed or cooked before it is served, divide its purchase price by its usable yield: beef at $5.65 a pound with 90% usable costs $5.65 ÷ 0.90 = $6.28 a pound on the plate. The cooking yield guide shows how to measure that loss, and the recipe costing guide walks a full recipe from invoice to portion. Add a small Q factor for the oil, salt and bread service that no recipe line carries: a $0.40 bread service at 200 covers a week is $4,160 a year. A recipe costed at menu launch describes supplier prices on that day; keep its source date and check later invoices before treating it as current.

Use the formula in reverse to set a price

Treat the result as a starting point. Check what the dish contributes in dollars, not just its percentage, and what guests will pay for it. The menu pricing guide covers the rest, including why markup and margin are different numbers.

What counts as food, and what does not

Reading the result

A period number on its own says little. Compare it with the last few periods, with the same period last year, and with your theoretical food cost — the plate costs of what you actually sold, weighted by how many of each. The gap between actual and theoretical is variance, and the ideal vs. actual guide shows how to read it. Put the gap in dollars before deciding how much time it deserves: 3.7 points on $1,250,000 of annual food sales is $46,250 — a difference to investigate, not savings you can count on.

For a national reference point, the National Restaurant Association's 2024 medians were 32.0% of sales for full-service and 32.4% for limited-service restaurants, for food and non-alcohol beverages together — medians, not goals. The good food cost guide explains why a pizzeria and a steakhouse can both be healthy at very different percentages.

Read changes in percentage points, not percent. If the burger's cost rises from $4.20 to $4.80, its food cost goes from 28% to 32% — up four points, while the ingredient cost rose 14.3%. At 100 burgers a week and an unchanged price, that is $60 a week, or $3,120 over a year if it holds. Confirm the price on the invoice before acting on it; the invoice price audit shows how.

Mistakes that skew the number

1. 1.Using purchases instead of usage. Invoices divided by sales ignore what went onto or came off the shelves.
2. 2.Mismatched dates. A delivery that arrives after the closing count but is booked in the period raises this period's food cost and lowers the next. Match invoices to the count date.
3. 3.Valuing stock at the wrong price. Count at what you paid per counting unit — not at menu price and not from an old price list.
4. 4.Mixing food and beverage. Counting drink sales without drink costs makes food cost look lower than it is. Include both or neither.
5. 5.Averaging dish percentages. A menu's food cost is not the average of its dishes' percentages. Weight each dish by how many you sold; a shift in what sells can move the period number without any recipe changing.
6. 6.Estimating a count. An estimated ending inventory makes this period's number and the next one guesses.

Marji does the dish side: invoice extraction suggests lines and ingredient matches, and every line needs your review before confirmation records a cost. A confirmed price can then recost affected recipes; their quantities, units, yields and completeness still need checking. Marji does not count inventory or import POS sales, so the period formula still needs your own count and your sales report.

Plan next month separately with the monthly food purchasing budget, which distinguishes consumption, orders and supplier payments.