How to Calculate Food Cost Percentage (And Why It's Quietly Killing Your Margins)

If you've ever looked at a busy Saturday night and wondered why you still have no money, food cost percentage is usually somewhere in the answer.

Food cost percentage is the ratio of what you spend on ingredients to what you bring in from food sales. The industry target for most full-service restaurants is 28–32%. Fast casual tends to run a bit higher. Fine dining can go lower because price point is doing heavy lifting. But if you don't know your number, you're flying blind.

The Formula

Food cost % = (Cost of ingredients sold ÷ Food revenue) × 100

Example: You sold $8,000 in food last week. Your ingredient cost was $2,640. That's a 33% food cost - slightly above target, worth paying attention to.

Why Most Owners Don't Know Their Number

Costing every dish feels tedious. Most operators built their menu by feel - this dish costs about $4 to make, I'm charging $16, feels fine. The problem is that feeling doesn't account for:

• Waste and trim loss. A whole chicken has bones. An avocado has a pit. A head of romaine has outer leaves you throw away. If you cost a dish using the purchased weight rather than the usable yield, your number is wrong - and usually wrong low.
• Portion creep. Over time, line cooks start being generous. The 6oz portion becomes a 7oz pour. That 17% cost increase happens one scoop at a time.
• Vendor price changes. Commodity prices fluctuate constantly. If you costed your burger in January using $4/lb ground beef and it's now $5.20, your margin just evaporated and you haven't touched anything.

How to Actually Cost a Dish

Take your burger for example. List every ingredient that goes on the plate:

• Ground beef (6oz patty): price per pound × 0.375 lbs = $1.95
• Brioche bun: $0.38 each
• Cheese slice: $0.22
• Lettuce, tomato, onion: $0.35 total
• Condiments, packaging: $0.12

Total ingredient cost: $3.02. If you're selling it for $14, your food cost is 21.6% - great. If it's $11 because you haven't raised prices in two years while beef costs have gone up 30%, you're at 27.5% and closing in on your ceiling.

The Quick Audit You Can Do Tonight

You don't need to cost every single menu item to get started. Pick your top 5 sellers by volume and your top 5 by revenue. Cost those 10 items. They're probably driving the majority of your food spend anyway. If any of them are running above 35%, that's your first problem to fix - either reprice, respec the portion, or find a cheaper source.

Your Menu Price Needs a Buffer

A common rule of thumb: to hit 30% food cost, multiply your ingredient cost by 3.33 for your menu price. If a dish costs $4.50 to make, you need to charge at least $15 to stay at 30%. A lot of owners price at $13 because it "sounds better" and wonder why they're broke.

Food cost percentage is not a set-it-and-forget-it metric. Review it monthly at minimum. When commodity prices spike - and they will - you need to catch it before it compounds. One dish mispriced by $2 isn't a catastrophe. Twelve dishes mispriced by $2, served 40 times a week each, is how restaurants close.