The food cost formula in one line
| Per dish | Whole restaurant |
|---|---|
| food cost % = (ingredient cost per serving ÷ selling price) × 100 | food cost % = (cost of goods sold ÷ food sales) × 100 |
Ingredient cost per serving is the food used in one sale; selling price is what you charge for that serving. Cost of goods sold, or COGS, is the food consumed during a period after inventory changes; food sales are revenue from food in that same period. Our food cost calculator runs the per-dish version for you, including yield and unit conversion.
What counts as cost in the per-dish version
Build the ingredient total from everything that normally leaves the kitchen with the item. Include the principal ingredient, sauces, sides, garnishes, and a small accompaniment supplied with the order. If packaging is part of how that item is sold, track it alongside the recipe for the pricing decision, while keeping it identifiable so you do not confuse packaging with food COGS later.
Use the amount actually served rather than the size of the purchase pack. Yield matters when trimming, peeling, draining, or preparation makes only part of a purchase usable: the purchase price is spread over that usable part, raising the cost of each edible unit. That is why the purchased weight and the plated weight can imply different unit costs. A recipe with a low-cost main ingredient can still be understated if several toppings and condiments are omitted. Decide whether a component belongs to the standard serving, document the portion, and apply that choice consistently when you revisit the item.
How to find cost of goods sold for the whole restaurant
The inventory equation is COGS = beginning inventory + food purchases − ending inventory. Beginning inventory is the food on hand at the start of the period. Add food received during the period, then remove the food still on hand at the end. The remainder is the food that left inventory, whether it was sold, served to staff, offered without charge, sampled, or discarded.
Value both inventory counts at cost, using your purchase records or a consistent inventory costing method. Menu prices do not belong in these counts. Keep non-food supplies out of food purchases, and account for returns and supplier credits rather than treating the original invoice total as food used. If you also sell drinks, track their purchases and inventory separately; food COGS should be compared with food sales, not with a combined food-and-beverage total.
Count at a repeatable point, such as before opening on the first Monday of each month. Counting after a delivery one month and before it the next creates timing noise. Record receipts and transfers around the cut-off.
Staff meals, complimentary dishes, and tasting portions require a consistent policy. For a view of all food consumed by the operation, keep them in food COGS and separately note why they were used. That makes the gap between ingredient estimates and actual inventory movement easier to investigate. If you instead classify some uses elsewhere, document the rule and apply it the same way in every period.
A worked example with the whole-restaurant formula
Suppose a restaurant begins the month with $12,000 of food inventory, buys $38,000 of food, and ends with $11,000 of food inventory. Food sales for the month are $120,000. First calculate food COGS: $12,000 + $38,000 − $11,000 = $39,000. Then divide that cost by food sales: $39,000 ÷ $120,000 × 100 = 32.5%.
That result falls within a commonly used 30%–35% reference range, but the range is only a guide. A quick-service counter, full-service dining room, and bakery have different cost structures. Compare periods with the same definition of food sales.
Now suppose the same restaurant also made $30,000 in beverage sales. Adding that revenue to the denominator while leaving beverage costs out of the numerator produces $39,000 ÷ $150,000 × 100 = 26.0%. The lower number looks favorable only because two businesses with different cost structures were mixed. The operation did not improve; the measurement changed. Use the whole-restaurant figure for inventory and purchasing decisions, and the per-dish formula for an individual menu item. Neither replaces the other.
Mistakes that break the formula
- Using purchases instead of COGS. An invoice tells you what arrived, not what was consumed. If ending inventory grew, treating all purchases as food used overstates the period’s cost; if stock was drawn down, it can understate it.
- Adding beverage sales to food sales. The 26.0% calculation above divides food cost by a mixed revenue total. It makes the food percentage appear lower and prevents the beverage category from being measured on its own terms.
- Ignoring food without a sale. Complimentary dishes, staff meals, tasting portions, spoilage, and waste still remove ingredients from inventory. If they are not recorded or explained, the gap between recipe estimates and actual COGS looks mysterious.
- Using tax-inclusive sales as the denominator. Sales tax collected for a tax authority is not food revenue available to pay for ingredients. A larger denominator pushes the percentage down even though the amount of food consumed did not change.
- Changing the inventory count point or guessing stock. A count before one delivery and after another creates noise between periods. Estimated ending stock can make the equation appear precise while hiding missing, spoiled, or transferred food.
If the number is ready and you want to tell guests about a new dish, the email guide covers consent and sending.
How often to recalculate
Run the whole-restaurant calculation monthly alongside a physical inventory count. Close the sales and purchasing period at the same time as the count, and compare the result with prior months built on the same method. Keep a separate food worksheet and beverage worksheet; a combined headline can hide a shift in either category. When the percentage moves, inspect purchase prices, stock levels, complimentary food, and waste before assuming menu prices caused it.
Revisit an individual dish when a supplier changes prices, the recipe changes, portions are adjusted, or the selling price changes. A strong change in which items guests buy can also alter the restaurant-wide result even if each recipe is unchanged. Record the date and inputs used for each revision so the next calculation has a useful baseline. Costing a whole batch instead of a single plate? The recipe cost calculator gives you the batch total and the cost per serving.
Frequently asked questions
What is the food cost formula?
For one dish, divide ingredient cost per serving by selling price and multiply by 100. For the restaurant, divide food COGS by food sales and multiply by 100. In both, the numerator is a food cost and the denominator is sales from the same scope and period.
Should I calculate food cost per dish or for the whole restaurant?
Use both for different decisions. Per-dish cost helps price or revise an item; the restaurant-wide percentage reflects purchasing, waste, and sales mix. A dish estimate misses complimentary food and unsold ingredients consumed by the operation, so it cannot stand in for an inventory-based monthly result.
How do I calculate cost of goods sold for a restaurant?
Add beginning food inventory to food purchases, then subtract ending food inventory. Value counts at cost, not menu price, and take them at a consistent point each month. Keep food and beverage purchases and inventory separate for a food-only result, and reconcile supplier credits before you calculate.
Do I include drinks in food cost?
Calculate food and drinks separately because their cost and selling-price structures can differ. Combining beverage sales with food costs misleads both category results, making food performance look better without changing the kitchen. The 26.0% example above shows the effect of a mismatched denominator.
Why is my food cost percentage different from the industry average?
First compare definitions: drinks, complimentary and staff meals, tax, net versus gross sales, and inventory counts. Different categories or count dates can produce different percentages from similar activity. Once methods match, review supplier prices, waste, portions, and menu mix before treating a reference range as a target.
How often should I recalculate food cost?
Calculate the restaurant-wide figure monthly with a physical count and matching sales period. Recalculate a dish when supplier prices, portions, ingredients, or selling price change. Keep food and beverage worksheets separate, and record the inputs so a later change has a clear explanation.
Start with the scope of the decision. Use a dish calculation for a recipe and its price; use monthly inventory to understand food consumed across the restaurant. Keep food and beverage boundaries, count dates, and sales definitions consistent. Save each month’s inputs alongside the result so you can trace what moved. Only then can a changed percentage point to something worth investigating instead of a change in bookkeeping.