The restaurant food cost formula calculates cost of goods sold for a period. It is different from costing one recipe. Recipe costing estimates what an item should cost; the food cost formula shows what the restaurant actually used during a day, week, month, or accounting period.
Restaurant food cost formula
The basic food cost formula uses beginning inventory, purchases, and ending inventory to calculate cost of goods sold.
Cost of goods sold = beginning inventory + purchases − ending inventory
Food cost percentage is calculated by dividing cost of goods sold by food sales, then multiplying by 100.
Food cost percentage = cost of goods sold ÷ food sales × 100
Restaurant food cost formula example
If beginning inventory is $12,000, purchases are $28,000, and ending inventory is $10,500, cost of goods sold is $29,500.
If food sales are $95,000 for the same period, food cost percentage is about 31.1%.
Actual food cost vs theoretical food cost
Actual food cost comes from inventory, purchases, and sales. Theoretical food cost comes from recipes, portions, and menu item sales. Actual food cost shows what really happened. Theoretical food cost shows what should have happened if recipes and portions were followed perfectly.
The difference between actual and theoretical food cost is where many profit leaks hide.
Why actual and theoretical food cost differ
- Waste, spoilage, or expired product.
- Over-portioning during busy shifts.
- Recipe drift or inconsistent prep.
- Theft, comps, remakes, and mistakes.
- Incorrect inventory counts.
- Vendor price changes not reflected in recipe costs.
- POS buttons, modifiers, or menu item mapping issues.
How often should restaurants calculate food cost?
Many restaurants calculate food cost monthly, but weekly tracking is better for high-volume or high-cost operations. Weekly food cost reviews can catch pricing changes, waste, portioning issues, and inventory problems before they become larger month-end surprises.
Common food cost formula mistakes
- Using purchases alone instead of beginning inventory plus purchases minus ending inventory.
- Comparing food cost to total sales instead of food sales when beverage sales are separate.
- Using inventory counts from the wrong date range.
- Ignoring transfers, credits, comps, waste logs, and vendor rebates.
- Failing to separate food, beverage, paper, and packaging when needed.
Restaurant food cost formula FAQ
What is the basic restaurant food cost formula?
The basic formula is beginning inventory plus purchases minus ending inventory. This calculates cost of goods sold for the period.
How do you calculate food cost percentage?
Divide cost of goods sold by food sales, then multiply by 100. For example, $29,500 in food cost divided by $95,000 in food sales equals about 31.1%.
Is recipe cost the same as food cost?
No. Recipe cost estimates what a menu item or batch should cost based on ingredients and portions. Period food cost shows what the restaurant actually used based on inventory, purchases, and sales.
Why is my actual food cost higher than recipe cost?
Actual food cost can be higher because of waste, spoilage, over-portioning, remakes, comps, theft, inventory errors, vendor price changes, or recipes not being followed correctly.