Cost of goods sold is the value of the products actually used to generate a period's sales. In a restaurant it connects inventory, purchasing, recipe costings and gross margin.
Cost of goods sold (COGS), or cost of sales, represents the monetary value of the food, drink and consumables used to produce a period's sales. It should not be confused with purchases. Buying €20,000 of product in a month does not mean the restaurant has used €20,000: some of it may still be in the cold room, storeroom or cellar, and some of what was used may have come from opening inventory. That is why cost of goods sold is calculated by adjusting purchases for opening and closing inventory.
In hospitality it is a central metric because it tells you what it really cost to sell what you sold. From it you calculate actual food cost, beverage cost, gross margin, inventory variances and profitability for the period. It can be measured overall or split by family: food, drink, wines, cocktails, delivery packaging or retail products. A professional reading also distinguishes theoretical from actual cost.
Theoretical cost comes from recipe costings and sales: if you sell 100 portions and each should use €3.20 of ingredients, theoretical cost is €320. Actual cost comes from inventory and purchases. The difference reveals waste, over-portioning, recording errors, theft, expired product, unrecorded complimentary items or outdated supplier prices. So cost of goods sold is not just an accounting figure; it is an operational control tool.
If it rises without sales rising, the restaurant is losing margin even if the dining room looks full.
Cost of goods sold = Opening inventory + Net purchases - Closing inventory
The formula takes the inventory available at the start of the period, adds the net purchases made and subtracts the inventory left at the close. Net purchases must exclude returns, credit notes and adjustments for product not used. If a restaurant starts the month with €12,000 of inventory, buys €34,000 of food and drink and finishes with €10,500 in stock, its cost of goods sold is 12,000 + 34,000 - 10,500 = €35,500. If net sales for the period are €110,000, cost of goods sold as a percentage of sales is 35,500 / 110,000 × 100 = 32.27%.
That percentage can be compared with the target food cost, the standard cost and the business's own history.
A Mediterranean restaurant reviews May. It had €9,800 of opening inventory, bought €27,400 during the month and closed with €8,900 in stock. Its actual cost of goods sold is €28,300. Net sales were €86,000, so cost of goods sold represents 32.9%.
The target was 30%. Cross-checking with recipe costings, management sees that the theoretical cost of what was sold was €25,600. The actual-versus-theoretical variance is €2,700. Breaking it down by family reveals the problem: fish and wine are well above target.
In fish there was waste from poor booking forecasts, and in wine there was complimentary consumption that had not been recorded. The right response is not to blame the team or raise the whole menu at once. First, the fish purchasing forecast is adjusted, FIFO is reinforced in the cold room, comps must be recorded in the POS and the prices of two wines are reviewed. The following month, cost of goods sold falls to 30.8% on similar sales, recovering more than €1,700 of margin.
Cost of goods sold matters because it is the basis of gross margin. If it is not measured properly, a restaurant may believe it is making money because it turns over a lot, when in fact it is using too much product to generate those sales. It also avoids wrong decisions: looking only at purchases can cause alarm in months with heavy restocking, or hide problems when accumulated stock is being drawn down. Measuring cost of goods sold lets you compare periods, control purchases to sales, detect variances between theoretical and actual usage, value inventory correctly, negotiate with suppliers and make menu changes based on data.
In multi-site businesses it is especially useful for spotting sites that buy the same as others but use more, have more waste or record their stock movements less accurately.
Zindra helps you calculate cost of goods sold by linking opening and closing inventory, purchases, delivery notes, sales, recipe costings, waste and financial reporting. You can compare actual cost with theoretical cost, separate food from drink, detect variances by family or product and see how each change of supplier, price or recipe affects gross margin. That way the restaurant no longer depends on monthly spreadsheets and can act before the accounting close confirms a loss that was already visible in operations.
Tools and content to go deeper into this concept.
Gross margin is the difference between sales and the direct cost of what was sold, mainly food and drink. It measures how much money is left to cover staff, rent, utilities and profit.
Food cost is the percentage of a dish's selling price that goes on the cost of its ingredients. It is the single most important indicator of how profitable your menu is.
Perpetual inventory is a stock control system that updates stock levels in real time with every movement in and out, unlike periodic inventory, which is only checked at set points in time.
Beverage cost is the percentage of a drink's selling price that goes on what the drink cost to buy. It is the key indicator for measuring the profitability of the drinks, wine and cocktail list.
Inventory variance is the difference between the theoretical stock a restaurant should have according to purchases, sales and recipe costings, and the physical stock it actually finds when counting the stockroom or cold room.
The purchases-to-sales ratio measures what percentage of revenue is being spent on buying ingredients in a period. It is a quick signal for spotting food cost variances, excess stock or planning problems.
Actual usage is the value or quantity of product a restaurant has really used during a period, calculated from opening inventory, purchases and closing inventory.
Standard cost is the expected cost of producing a dish, service or period using recipes, agreed prices, yields and expected usage. It acts as a benchmark against which actual cost is compared.
Weighted average cost is the average unit cost of a product, calculated according to the units bought at different prices. It is used to value inventory and usage without relying only on the last purchase price.
Every hospitality term with formulas, examples and benchmarks in a handy PDF.
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