The short version.
Food cost goes up when the math behind the percentage changes: supplier prices, pack sizes, yield, waste, portions, discounts, or sales mix. Do not start with the P&L. Start with the invoice lines and the dishes that sold.
A rising food cost percentage is not a diagnosis. It is a smoke alarm.
The bad move is to stare at the P&L and argue about whether the target should be 28%, 30%, or 32%. The better move is to ask what changed underneath it. Did beef move? Did the case get smaller? Did the line start over-portioning fries? Did brunch sell more low-margin plates? Did your menu price stay still while the invoice price moved twice?
The market is giving restaurants plenty of ways to get fooled right now. USDA ERS said food-away-from-home prices were 3.6% higher in April 2026 than April 2025, while food-at-home was 2.9% higher.1 BLS showed full-service meals and snacks up 3.8% year over year in April 2026.2 USDA also said beef and veal prices were 14.8% higher year over year in April 2026 and forecast a 12.1% increase for 2026.3
Those numbers do not explain your restaurant by themselves. They do explain why last quarter's recipe sheet can become stale fast.
What changed: price, portion, yield, waste, or mix?
Break the problem into five buckets. Do not let everything collapse into one percentage.
| Bucket | What it looks like | First place to check |
|---|---|---|
| Supplier price | The same case costs more than last month | Latest invoice vs. last clean invoice |
| Pack size or yield | The case price looks flat, but usable ounces fell | Pack description, drained weight, trim loss, cooked yield |
| Portion creep | The recipe says 6 oz, the plate leaves with 7 oz | Line checks, ladles, scoops, scales, prep sheets |
| Waste | More spoilage, fire, remake, or over-prep | Waste log, prep par, returns, comps |
| Sales mix | Guests buy more of the dishes with weaker margin | POS item mix and dollar margin per dish |
One restaurant can have all five at once. That is why broad food-cost reports feel useless. They tell you the roof is leaking. They do not tell you which pipe burst.
How do you find the leak without boiling the ocean?
Start with the items that can actually move the month. A $2 jump on a garnish matters less than a 30-cent jump on a dish you sell 1,000 times.
- Pull the top 20 invoice items by spend. Proteins, dairy, oil, coffee, seafood, bread, produce, and anything bought across locations.
- Pull the top 20 menu items by sales count. Not revenue. Count matters because small plate-cost moves repeat.
- Match invoice lines to recipes. Use item, supplier, pack, date, and usable unit. This is where supplier price tracking stops being clerical work and starts becoming margin work.
- Compare today against the last clean period. Not the oldest recipe card in the office. The last period where you trust the invoice and portion math.
- Rank by dollars lost. Percentage movement is a clue. Dollars lost is the action list.
This is the same reason we talk about restaurant cost memory. You need a running record of what changed, what dishes it touches, and what the owner or chef decided last time. Otherwise every food-cost review starts from zero.
Worked example: the percentage is up, but the fix is one dish
Example. Say a burger sells 1,200 times a month. The recipe uses 6 oz of beef. A 10 lb case has 160 oz before trim. If the usable yield is 85%, the case gives 136 usable ounces.
At $82 per case, beef costs about $0.603 per usable ounce. The 6 oz portion costs $3.62. If the case rises to $94, the usable ounce cost becomes $0.691 and the burger beef cost becomes $4.15. That is a $0.53 plate-cost move.
At 1,200 burgers a month, that one change is about $636 of monthly margin before you count buns, cheese, fries, waste, or comps. USDA's April 2026 beef data is exactly the kind of market move that makes this check worth doing.3
The fix may not be “raise every menu price.” It might be a burger price change, a lunch-special change, a supplier quote check, a tighter portion spec, or a different cut. The point is to tie the action to the dish that moved.
When the case price is not the real problem
Operators often ask, “Did my supplier raise prices?” Good question. Not enough.
A supplier can keep the case price steady and still hurt you if the pack changes from 6/#10 cans to a smaller drained weight, if a substitute brand throws more trim, or if the “same” chicken breast arrives in a size that cooks down differently. You pay for the case. The menu earns money from the usable portion.
That is why the check should be:
| Do not stop at | Use this instead |
|---|---|
| Case price | Usable ounce, pound, liter, each, or portion cost |
| Food cost percentage | Dollar margin lost by dish |
| Supplier average | Item-by-item movement with date and pack size |
| Recipe sheet | Recipe tied to the latest trusted invoice or quote |
If you do not have clean recipe math yet, start with the obvious winners and losers. Your highest-volume dishes, expensive proteins, fryer oil, coffee drinks, dairy-heavy dishes, and batch sauces will teach you more than a perfect spreadsheet nobody updates.
What should you do after you find the driver?
Pick the smallest fix that protects dollars without annoying guests or the kitchen.
If supplier price moved, quote-check the item and compare delivery, quality, pack, terms, and reliability. Cheapest is not always better. If portion moved, fix the scoop, ladle, cut size, or plating spec. If waste moved, reset prep par and shelf-life rules. If sales mix moved, look at menu placement, specials, bundles, and which dishes deserve a price change.
If many dishes moved at once, run a menu review. But do not make it theater. A good review has the latest invoice prices, recipe yields, POS counts, menu prices, and a short action list. Mornay exists to keep that cost memory current from messy invoices, menus, recipes, POS exports, and operator corrections, then show what changed and what to approve next. Start at getmornay.com if you want that review done with your real numbers.
The rule is simple: food cost percentage tells you there is smoke. Invoice-to-dish math tells you where the fire is.
References
- USDA Economic Research Service, Food Price Outlook: Summary Findings, May 2026 update. ERS reported April 2026 food-away-from-home prices up 3.6% year over year and food-at-home up 2.9% year over year.
- U.S. Bureau of Labor Statistics public API, CPI series CUUR0000SEFV01, full-service meals and snacks. April 2026 index 242.927 vs. April 2025 index 233.973, a 3.8% year-over-year increase.
- USDA Economic Research Service, Food Price Outlook: Summary Findings, May 2026 update. ERS reported beef and veal prices 14.8% higher in April 2026 than April 2025 and forecast a 12.1% increase for 2026.
FAQ
Why is my restaurant food cost percentage going up?
Food cost percentage usually rises because supplier prices moved, pack sizes changed, yield got worse, portions crept up, waste increased, comps and discounts grew, or guests shifted toward lower-margin menu items. Start with invoice lines and POS mix before blaming one broad number.
What should I check first when food cost jumps?
Check the top 20 items by spend and the top 20 dishes by sales. Compare the latest invoice price, pack size, usable yield, recipe portion, and menu price against the last clean period. That usually finds the leak faster than reviewing every item.
Can food cost go up even if suppliers did not raise prices?
Yes. Food cost can rise when prep waste increases, cooks over-portion, a substitute has lower yield, discounts hit high-cost dishes, or sales shift from high-margin items to low-margin items. Case price is only one part of the math.
How much of a food cost increase is worth action?
Act when the increase costs real dollars. A one-point move on $80,000 of monthly food sales is $800. A 30-cent plate-cost move on a dish that sells 1,000 times a month is $300. Use dollars lost, not only percentage points.
Should I raise menu prices when food cost rises?
Maybe, but do the dish math first. Some problems are fixed by buying differently, correcting a recipe, changing a portion, handling waste, or swapping a garnish. Raise menu prices when the cost change is real, recurring, and tied to dishes guests will still buy.