Plate cost is only the ingredients on one serving. Labour, rent and packaging come later. As an owner-operator in Calgary, I want the portion and invoice unit written down before I judge a menu margin; guessing either makes the food-cost percentage drift.
Batch cost = sum of (unit cost × quantity used)
Plate cost = batch cost ÷ plates in the batch
Menu price at target = plate cost ÷ target food cost %
Food cost % = plate cost ÷ menu priceUse a decimal for the target: 30% = 0.30. Multiply the final food-cost ratio by 100 to display a percentage. Unit cost and quantity must use the same unit: a 6 oz portion is 6 ÷ 16 = 0.375 lb.
Use the plate cost calculator to run the arithmetic while you type. It is labelled Canadian dollars, before GST/HST. For a USD worksheet, the arithmetic is the same, but keep every input and output in USD; it is not a currency converter.









