Actual vs theoretical food cost: how to find the gap
By mise · Updated September 29, 2026
Quick answer: theoretical food cost is what food should have cost based on recipe costs × items sold; actual food cost is what it did cost, from inventory (beginning + purchases − ending). Variance = actual − theoretical, in dollars or percentage points. Under 1.5–2 points is good; more means waste, over-portioning, theft or recipes that are out of date.
Food cost percentage tells you there is a problem. Comparing actual with theoretical tells you how big it is — and, item by item, where it is.
The two numbers
| Theoretical | Actual | |
|---|---|---|
| Question | What should food have cost? | What did food cost? |
| Formula | Σ (recipe cost × units sold) | beginning inventory + purchases − ending inventory |
| Needs | Costed recipes + POS item sales | Two counts + all invoices |
What variance is normal
A gap of 1–2 percentage points is normal: trim, tastings and small errors. Above 2 points is money to chase; above 4 points usually means something systematic.
Finding the causes, item by item
- Compute usage per ingredient from the counts (beginning + received − ending).
- Compute expected usage from recipes × items sold.
- Rank ingredients by the dollar gap. The top five usually explain most of it.
- For each: check portioning, unrecorded waste, recipe changes, transfers, comps and theft.
Common causes
- Portions bigger than the recipe card.
- Waste and staff meals not recorded — see the waste log.
- Recipe costs using old prices.
- Invoices missing or entered in the wrong week.
- Counting errors — the invisible one.
In mise each count is compared with what you should have had, per product, in units and dollars, so the top gaps are on one screen.
Point the camera and the product comes up complete: name, brand, category, size and photo — the mise AI finds it from the barcode or a photo. 7-day free trial, no card.
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Frequently asked questions
What is theoretical food cost?
The food cost you would have if every dish were made exactly to recipe with no waste: the sum of recipe cost × units sold, divided by food sales.
What is a good food cost variance?
Around 1–2 percentage points between actual and theoretical. Above that there is money to recover.
How do I calculate actual food cost?
Beginning inventory + purchases − ending inventory, divided by food sales.