Food cost % hides more than it shows
Most restaurants track food cost as one percentage: purchases divided by sales for the month. It's a useful headline, but it can't tell you why an outlet is at 36% when its sister outlet is at 31%. Was it a price increase, over-portioning, wastage, theft, or simply a different sales mix?
Your POS knows what you sold. Your purchase records know what you bought. Neither, on its own, knows what you should have used. That's the gap variance analysis fills.
Two numbers you need
Variance compares two measures of consumption for each ingredient over the same period.
If you sold 400 plates of paneer tikka and the recipe uses 180 g of paneer, theoretical paneer consumption is 72 kg.
If the outlet opened with 20 kg, received 90 kg, sent nothing out and closed with 30 kg, actual consumption was 80 kg.
With 3 kg of logged wastage, the unexplained gap is 80 − 72 − 3 = 5 kg. Valued at your purchase price, that's the money to go looking for.
What you need in place
- Recipes for your top sellers. You don't need every item on day one. The items that make up most of your sales usually account for most ingredient consumption.
- POS items mapped to recipes. Each menu item, including variants and add-ons, needs to point to a recipe.
- Receipts recorded at the outlet. Purchases must be booked to the outlet that received them, on the day they arrived.
- Regular counts. Weekly counts of high-value ingredients are more useful than one exhausting monthly count of everything.
- Wastage logged with reasons. Otherwise genuine wastage and real losses look the same.
Reading the results
Start with the ingredients where variance is highest in value, not percentage. A 20% variance on coriander matters less than a 6% variance on paneer or chicken.
Then look for patterns. Variance concentrated in one outlet points to local practice: portioning, receiving or security. Variance across all outlets for one ingredient often points to the recipe itself being wrong, or a yield that's changed with a new vendor.
Making it routine
Variance is most useful weekly, while the week is still fresh in the manager's memory. Assign each outlet a target band, review the top five ingredients by value, and record what was found. Over a few months, the conversation shifts from "food cost is high" to "paneer portions at Outlet 3 are running 15 g over".
DeepRestaurantAI calculates theoretical consumption from your POS sales and recipes, actual consumption from receipts, transfers and counts, and shows the unexplained variance per outlet and ingredient. You can also try the basic calculation for a single dish with our food cost calculator.