Food Cost Percentage

In practice

Kitchens and finance teams calculate food cost percentage over a fixed period — typically weekly or monthly — using the cost of goods sold for food against the revenue food items generated in that same period. Restaurants that also sell alcohol usually separate food revenue from beverage revenue, because the two carry very different cost structures and blending them hides where margin is actually made or lost. The cost side accounts for opening inventory, purchases, and closing inventory, not simply invoices paid during the period, so a kitchen that stocks up before a busy weekend does not show an artificial spike.

Formula

Food cost ÷ Food revenue × 100 With food cost of €12,000 and food revenue of €40,000: €12,000 ÷ €40,000 × 100 = 30%.

Example

A kitchen holds food cost steady at €8,000 for two consecutive months while revenue moves. In the first month, revenue of €25,000 gives €8,000 ÷ €25,000 × 100 = 32%. In the second month, revenue drops to €20,000 while the same €8,000 is spent on ingredients: €8,000 ÷ €20,000 × 100 = 40%. Nothing changed in the kitchen — purchasing, portioning, and waste were identical — yet the ratio moved eight percentage points because the denominator fell. Reading the percentage without checking covers, average check, or seasonality would wrongly suggest a cost-control problem.

How to use it

The percentage is most useful as a trend line rather than a single reading: tracked weekly against a target range set from the menu's ingredient mix, it flags when purchasing prices, waste, or portioning drift away from what the menu was priced to deliver. Because the ratio reacts to both cost and revenue, a sudden change should be checked against covers and average check before being treated as a cost problem — a fall in traffic can move the number as much as a rise in ingredient prices. Comparing the ratio dish by dish, using each item's individual cost against its menu price, locates which products are pulling the overall number away from target, rather than treating the kitchen as one undifferentiated cost center.

What affects it

• Supplier and market prices for ingredients, including seasonal swings on produce and proteins
• Portion sizes and consistency of plating across shifts and staff
• Waste from spoilage, trim, and kitchen error
• Menu mix — the share of covers sold from higher-cost versus lower-cost dishes
• Menu pricing relative to ingredient cost
• Discounts, comps, and promotional offers that reduce food revenue without reducing food cost
• Inventory shrinkage, including theft or unrecorded stock movement