The formula is straightforward. What most operators discover when they run it for the first time is that the number is higher than they expected.
Food cost percentage is calculated by dividing your cost of goods sold by your total food revenue, then multiplying by 100. If your restaurant spent $8,400 on food in a month and generated $30,000 in revenue, your food cost percentage is 28%. That is the number every operator needs to know, and most do not.
Cost of goods sold is the total amount you spent on food and ingredients during a specific period. Total food revenue is all food sales during that same period. Both numbers need to cover the same time window, either weekly or monthly. Most operators find monthly the most practical starting point.
Beginning inventory is the dollar value of food you had on hand at the start of the period. Add the value of all food purchases you made during that period. Then subtract the dollar value of what is left at the end. The result is the cost of what you actually used and sold during that time.
This calculation requires taking physical inventory at the start and end of each period. If you are not currently doing that, the simplified method below gives you a useful starting point.
Many independent operators do not have a formal inventory system in place, which makes the full cost of goods sold calculation difficult. A simpler starting method: total all your food invoices and supplier receipts for the month and divide that total by your total food revenue for the same month. The result is an approximate food cost percentage.
This method is not perfectly precise because it does not account for beginning and ending inventory levels. But it gives you a working estimate and a baseline to measure against month over month. Most operators find this number is meaningfully higher than they expected, which is useful information on its own.
Monthly is the minimum. Weekly is better, especially if you are actively trying to close the gap between your current food cost and the 28% benchmark. A monthly calculation tells you where you are. A weekly calculation tells you when something changed and gives you time to respond before the loss compounds.
Profit Kitchen tracks food cost weekly for clients on Tier 3 (Optimization) and above, and provides a monthly food cost review as part of the ongoing strategy call. Clients at any tier can add ongoing food cost monitoring as an add-on for $175 per month.
Compare it to the 28% benchmark. If you are above 28%, the next question is which specific menu items are driving the cost up. Recipe costing, which means calculating what each menu item actually costs to make including every ingredient and portion, will show you exactly where the gap is. From there, the three primary levers are menu price adjustments, portion standardization, and supplier renegotiation.
Most operators find that two or three items are responsible for a disproportionate share of the food cost gap. Fixing those items first produces the fastest result without requiring a full menu overhaul.
A free 20-minute strategy call will identify your food cost gap and what it is costing your operation. If you want to start with the numbers before the call, the free Profit Leak Audit walks through 10 factors affecting your delivery revenue right now.
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