Food Cost Formula for Restaurants (With Examples)

There is not one food cost formula. There are several, and each answers a different question about your restaurant’s financial health. This guide covers the exact formulas for plate cost, food cost percentage, ideal food cost, contribution margin, and menu pricing, with examples you can copy into your weekly review.

Free calculator

Calculate food cost and target menu price

Enter values in the same currency. The tool calculates plate food cost percentage, contribution margin before labor and overhead, and the menu price required for your target. No signup is required and the numeric inputs are not sent with the analytics event.

Food cost percentage

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Contribution margin

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Price at 30.0% target

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1. Per-Item Food Cost Percentage

This tells you what percentage of a single dish’s revenue goes to ingredients. Use it when pricing new items or evaluating existing ones.

Food Cost % = (Ingredient Cost ÷ Menu Price) × 100

A $28 salmon with $8.50 in ingredients: $8.50 ÷ $28.00 × 100 = 30.4%. That means 30 cents of every dollar from that dish covers the raw fish, sauce, and sides. The remaining 70 cents covers labor, rent, and — hopefully — profit.

2. Overall Food Cost Percentage

This measures your entire restaurant’s food cost for a given period (usually a week or month). It accounts for waste, theft, over-portioning, and everything else that per-item calculations miss.

Overall Food Cost % = (Beginning Inventory + Purchases − Ending Inventory) ÷ Total Food Sales × 100

Start of week inventory: $12,000. Purchases during the week: $6,500. End of week inventory: $10,200. COGS = $8,300. If food sales were $27,000, your overall food cost was 30.7%. If this number is higher than your per-item average, the gap represents a variance to investigate across waste, spoilage, portions, comps, transfers, count timing, recipe versions, purchasing and recording. The percentage alone does not identify a cause.

Weekly inventory calculator

Calculate actual food cost from inventory and sales

Use one consistent accounting period and currency. Include purchases and inventory for the same food-sales scope; treat transfers, staff meals and comps consistently.

Cost of food used

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Actual food cost percentage

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3. Ideal (Theoretical) Food Cost

This is what your food cost should be if there were zero waste, zero theft, and perfect portioning. Calculate it by multiplying each item’s per-unit ingredient cost by the number sold, then dividing by total food revenue.

Ideal Food Cost % = Sum of (Items Sold × Per-Item Cost) ÷ Total Food Revenue × 100

If your ideal food cost is 27% but your actual is 32%, you have a 5-point gap. That gap is a $1,000 weekly variance to reconcile before assigning cause. It may include waste, spoilage, portions, unrecorded comps, count timing, transfer treatment, purchase units, recipe versions or data errors. It is not automatically recoverable loss. Read our guide to reducing food cost to close that gap.

4. Contribution Margin

This tells you how many dollars each item contributes toward covering overhead and generating profit. It is the number used in menu engineering to classify Stars, Plowhorses, Puzzles, and Dogs.

Contribution Margin = Menu Price − Ingredient Cost

A $22 chicken parmesan with $6.50 in ingredients has a $15.50 contribution margin. A $16 burger with $6.40 in ingredients has a $9.60 contribution margin. Even though the burger has a similar food cost percentage (40% vs. 29.5%), the chicken contributes $5.90 more per plate. At 100 sales of each, that is $590 more weekly contribution before labor, occupancy, fees, overhead, tax and other costs—not $590 of net profit.

Check Eight Worked Pricing Examples

Compare exact ingredient-cost and target-percentage inputs, including the $8.90 Cajun salmon at 30% example. Every page shows the arithmetic, sensitivity and evidence boundary. For the inventory-based weekly calculation, use the actual food cost calculator above.

Open worked examples →

5. Menu Price from Target Food Cost

When pricing a new menu item, use this formula to calculate the minimum price needed to hit your target food cost percentage.

Menu Price = Ingredient Cost ÷ Target Food Cost %

If ingredients cost $7.20 and you target 28% food cost: $7.20 ÷ 0.28 = $25.71. Round to $26. If you target 32%: $7.20 ÷ 0.32 = $22.50. That $3.50 difference in price per plate, across 80 weekly sales, is $14,560 per year. Choosing the right target — informed by your restaurant type benchmarks — is essential.

6. Plate Cost (Cost Per Serving)

The total cost of every ingredient on the plate, accounting for trim, waste, and cooking yield. This is the most accurate input for all the formulas above.

Plate Cost = Sum of (Ingredient Cost × Portion Size ÷ Package Size)

A 5 lb bag of flour costs $4.50. Your recipe uses 0.3 lb. Flour cost per plate: $4.50 × (0.3 ÷ 5) = $0.27. Do this for every ingredient and sum them up. For proteins, account for trim and cooking loss — a 10 oz raw chicken breast yields roughly 7.5 oz cooked. If you need 6 oz on the plate, you need to start with 8 oz raw. Price accordingly. Learn more in our plate cost calculator guide.

Putting the Formulas Together

Each formula is a lens on the same underlying question: is this restaurant making money on food? Use plate cost to calculate accurate per-item food cost percentage. Use per-item food cost percentage to set menu prices. Use ideal food cost to benchmark against actual food cost. Use the gap between ideal and actual to find operational problems. Use contribution margin for menu engineering. And track overall food cost weekly to confirm the whole system is working. Miss any one of these and you have a blind spot. For the complete picture, read our food cost guide.

From calculation to weekly control

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Frequently asked questions

What is the food cost formula?

The core food cost formula is Food Cost % = (Ingredient Cost ÷ Menu Price) × 100. For a whole restaurant over a period, use Food Cost % = (Beginning Inventory + Purchases − Ending Inventory) ÷ Total Food Sales × 100.

How do you calculate food cost percentage?

Divide the ingredient (plate) cost of a dish by its menu price, then multiply by 100. Example: $8.50 in ingredients on a $28 dish is $8.50 ÷ $28 × 100 = 30.4% food cost.

What is the cost per serving (plate cost) formula?

Plate Cost = sum of (Ingredient Cost × Portion Size ÷ Package Size) for every ingredient on the plate, adjusted for trim and cooking yield. It is the most accurate input for food cost percentage.

How do you set a menu price from a target food cost?

Menu Price = Ingredient Cost ÷ Target Food Cost %. If ingredients cost $7.20 and you target 28% food cost, the price is $7.20 ÷ 0.28 = $25.71, rounded to $26.