Start with the formula, but do not stop there
The standard formula is simple: plate cost divided by menu price, multiplied by 100. If a dish costs $4.50 to produce and sells for $18.00, the food cost percentage is 25%.
That gives you a useful number, but it only stays useful when the underlying ingredient costs are current. If the chicken, oil, or produce prices changed last week and the recipe still reflects old pricing, the result looks precise but leads to the wrong decision.
Use current ingredient costs, not last month's spreadsheet
Most operators know the formula. The real issue is that ingredient costs drift constantly. Broadliner increases, produce volatility, and vendor substitutions all push recipe costs around faster than most spreadsheets get updated.
A reliable food cost workflow pulls from the same ingredient prices your team is actually paying. That is why invoice-driven costing matters so much. The recipe number becomes operational instead of theoretical.
Look at dish-level action, not just the blended average
A restaurant can hit an acceptable blended food cost and still lose margin on the dishes that matter most. The expensive item that sells every night deserves more attention than a blended monthly average that hides it.
Review each recipe against its target category margin, then identify the items that moved above target after recent supplier increases. That is where pricing or portion adjustments have the most leverage.