How to Calculate Restaurant Food Cost Percentage

Restaurant food cost percentage compares the cost of ingredients used with the food revenue earned over the same period. It is a useful operating measure because it connects purchasing, stock control, recipes, and selling prices. A change in the percentage is a signal to investigate; it does not identify the cause by itself.

Before calculating it, define your period and scope. Use food revenue rather than mixing food purchases with drinks revenue, and apply a consistent approach to taxes and discounts. A weekly view can reveal changes sooner, while a monthly review provides a wider picture. Compare like periods and keep your definitions unchanged.

Calculate actual food cost percentage

A simple inventory-based calculation is: ingredients used = opening food inventory + food purchases − closing food inventory. Actual food cost percentage = ingredients used ÷ food sales × 100. If stock moves between locations, account for transfers in and out consistently before comparing branches.

Here is a hypothetical weekly example in pounds. Opening stock is £2,000, purchases are £1,500, and closing stock is £1,800. Ingredients used are therefore £1,700. With food sales of £5,000 for that same week, food cost percentage is 34%. This example illustrates the arithmetic; it is not a target for every restaurant.

Understand theoretical food cost

Theoretical food cost estimates ingredient usage from recipes and the items sold. If a dish uses £2.40 of ingredients and you sell 100 portions, its theoretical ingredient cost is £240. Repeat that calculation across the menu to estimate the total recipe cost of recorded sales.

A difference between actual and theoretical usage can come from inaccurate recipes, inconsistent portions, spoilage, unrecorded staff meals, stock-count mistakes, or purchase-price changes. It is not proof of any one cause. Start with the largest ingredient differences, then check the underlying records before drawing conclusions.

Check the inputs before changing prices

An incorrect closing count can change the result more than a small supplier price increase. Use the same units for purchasing, recipes, and stock counts. A case of twelve bottles should not be entered as one bottle, and a kilogram should not be mixed with a recipe measured in grams without conversion.

• Check opening and closing stock dates against the sales period.
• Record ingredient transfers, waste, and approved non-sale usage.
• Update recipe costs when purchasing prices change.
• Review discounts and complimentary meals alongside recorded sales.

For example, replacing a supplier pack with a smaller pack at the same purchase price changes the unit cost even when the invoice total looks familiar. Keep pack size and usable yield visible in your review.

Decide what action the number supports

Avoid reacting to one percentage in isolation. Compare it with menu mix, selling prices, portion standards, and total contribution. A period with more sales of an expensive signature dish may show a higher ingredient percentage while still generating useful contribution toward wages and overheads.

Choose one investigation at a time: verify the count of a high-value ingredient, check recipe portions during service, or review an unusual purchase. Record the finding and compare the next period using the same method. This makes the number useful for decisions rather than simply another figure on a report.

Is a lower food cost percentage always better?

No. Cutting portions or ingredient quality can damage the guest experience, while a low percentage can also reflect an incomplete stock count. Look at contribution, waste, service consistency, and repeat demand together. Use your own concept and records to define a workable target.