Masterestaurant Index of the True Cost of Combos and Promotions 2026: the traditional method understates food cost by 7.4 points

Finding 1 — What does a combo really cost?

A combo costs on average 7.4 percentage points more than the traditional method claims, based on 8,400 accounts audited by Masterestaurant.

The root error is adding up the food cost of the burger, the fries and the drink separately and then applying the discount to the selling price. That calculation ignores three forces acting at once: the combo portion is larger, waste rises because there are more SKUs per ticket, and the implicit discount comes entirely out of the margin. A combo with 28% theoretical food cost and a 15% discount actually operates as if it had 40-41% real food cost. The register confirms it at month-end: solid food cost per component, margin that never shows up. The real cost isn't on the menu, it's in the operation. A combo's discount is subtracted from contribution margin, never from the selling price, and that's where the traditional method loses 4 to 5 points.

Finding 2 — The discount comes out of margin, not price

Treating a 15% discount as «I'm selling cheaper» hides that this percentage isn't absorbed by the customer or the supplier: it's absorbed by your profit. Diego F. Parra saw it across dozens of audits: the operator costs the three dishes separately, sees 28% food cost and relaxes. But the combo discount turns that 28% into an effective food cost of 40-41%. The MR method forces you to subtract the discount from margin before approving the combo, not after. If the dish already ran at 32% food cost —the recommended maximum— an aggressively discounted combo pushes it out of range without anyone noticing until the monthly close. A combo's fries or side dish weigh a median 17% more than their individual version, a figure drawn from the 8,400 audited accounts that almost nobody re-costs. It's a perceived-value hook: the customer feels the combo «gives more», and the operator over-portions to sustain that perception.

Finding 3 — The combo portion weighs 17% more

The problem is that this extra 17% of weight falls on the cheapest component of the plate, so it looks harmless. It isn't. That over-portioning moves the combo's food cost by 2 to 3 points that the traditional calculation never captures, because the traditional one uses the individual dish's recipe card, not the combo's. The MR rule is simple: the combo gets its own recipe card, with its own gramage weighed on a scale. Without that, you're costing a dish that doesn't exist. A well-selling combo displaces a median 18% of the ticket that previously went to higher-contribution-margin dishes, and that displacement is a cost even though it appears on no invoice. The classic error: the owner celebrates that the combo sells, without seeing that each combo sold is an appetizer, a dessert or a premium drink that stopped selling.

Finding 4 — Cannibalization has a measurable price

If the cannibalized dish left a 62% margin and the combo leaves 48%, each substitution costs 14 margin points on that portion of the ticket. The MR method measures cannibalization by comparing the sales mix before and after launching the combo, not the isolated food cost. A combo can have impeccable food cost and still destroy profitability if it displaces your anchor dishes. The right question isn't «how much does the combo cost?», but «what did I stop selling because of it?». A combo's theoretical food cost rarely matches what the register reports because the theoretical figure ignores waste from advance preparation, and that waste grows with each additional SKU on the ticket. More components per combo means more products prepped ahead of real demand: pre-cut fries that oxidize, bread that dries out, portioned sauce that gets discarded. In an individual dish the waste dilutes; in a combo with three or four SKUs it accumulates.

Finding 5 — Why theoretical food cost rarely matches the register

Across the 8,400 accounts, that gap between theoretical and real was a median 7.4 points. Diego F. Parra sums it up like this: «theoretical food cost is what you should spend in a perfect world; the register is what you spent in the real one». Costing combos without reconciling theoretical against real inventory is signing checks blindly. To know whether your combos are healthy, compare your theoretical-vs-register gap against the Masterestaurant index median of 7.4 points: below 5 points you're in the top third, above 10 points you're bleeding margin without seeing it. The index was born from a question Diego F. Parra heard over and over: «my combos have good food cost, why doesn't the margin show up?». The answer systematizes four fixes in order: first re-cost the combo's real gramage, second subtract the discount from margin and not from price, third measure cannibalization on the mix, and fourth reconcile theoretical against inventory.

Finding 6 — How to know which percentile your operation falls in

Masterestaurant turned that pattern into a replicable index so any owner can locate their percentile and know what to fix first, instead of cutting prices blindly. The first fix for a combo that yields no margin isn't raising the price: it's weighing the real gramage and rebuilding its recipe card, because that's where the hidden 17% over-portioning and 2-3 food cost points live. Raising the price without fixing the operation just passes the problem to the customer and risks volume. The order the MR method applies is surgical: step one, the combo's own recipe card with a scale; step two, move the discount from price to margin to see the real effective food cost of 40-41%; step three, check whether the combo cannibalizes your 60%+ margin dishes; step four, reconcile theoretical against register to hunt down waste. Only then, if the margin is still short, do you adjust price or composition.

Finding 7 — The right order to fix a combo that yields no margin

Diego F. Parra says it bluntly: a combo that isn't costed with its own recipe card isn't a promotion, it's a leak. The discount goes to cost, not revenue. Treating the combo's 15% discount as «I sell cheaper» hides that the discount comes entirely out of contribution margin. In the MR method the discount is subtracted from margin, not price: that reveals a combo with 28% theoretical food cost and a 15% discount operating as if it had 40-41% real food cost. The combo's portioning is larger. Across 8,400 checks, the combo side/garnish weighed a median 17% more than the standalone —a perceived-value hook almost nobody re-costs. That 17% extra gram weight on the cheapest component moves the combo food cost 2-3 points the traditional method never captures. Cannibalization has a price. A well-selling combo displaces a median 18% of the ticket that used to go to higher-contribution-margin dishes.

Finding 8 — The 4 differences that move the number

It's not new sales: it's sales migrated to lower margin. The MR Index quantifies it as opportunity cost and subtracts it from the combo's real margin. Theoretical cost isn't real cost. The median difference between the two was 7.4 points —driven by uncounted waste, theft/spoilage and recipe deviation. The traditional method assumes zero gap; the MR method measures it with actual vs theoretical inventory and loads it onto the combo.