Cost control in a restaurant: what to measure and how
In a restaurant, profit comes less from growing revenue than from seeing cost. Cost you cannot see you cannot manage — and the measurement starts with the recipe.
How portion cost is calculated
Portion cost is the total value, by weight, of the ingredients that go into a dish. The arithmetic is simple but the detail hides in it: not just the main ingredient but the sauce, the garnish, the oil, the spices and the service items have to be counted. Once a recipe is defined the calculation updates itself every time a purchase price changes; in a hand-kept spreadsheet nobody remembers when it was last touched.
Once cost is known, menu pricing stops being guesswork. You set a target food cost percentage and it becomes visible which items fall outside it. In most venues the surprise is that the best seller turns out to be the least profitable item.
The gap between theoretical and actual stock
In a recipe-based system every portion sold theoretically removes a set quantity from the store. The actual quantity found at count can be different. The gap says one thing: this much material disappeared without becoming a sale. The gap is never zero and is not expected to be — what matters is its size and its direction.
- A small, steady gap: normal production loss, acceptable
- A gap growing on one item: the portion size may be drifting
- A gap growing on one shift: a practice difference or a missing record
- A sudden, large gap: a counting error or unrecorded waste
Why waste should be recorded separately
Anything spoiled, dropped, mis-prepared or left over at close is waste, and if it is not recorded it blends into the gap above. Recording waste separately does two things: it cleans up the gap and it makes waste itself measurable. Knowing how much of which item is wasted is the only solid basis for adjusting production volume.
Four numbers to look at weekly
Cost control does not have to be a daily chore. Four numbers checked once a week are enough to catch problems before they grow.
- Food cost percentage: total ingredient cost over revenue
- Margin per item: which dish actually earns
- Theoretical-versus-actual gap: what vanished without a sale
- Waste rate: how much is lost on which item
Short questions, short answers
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