Why Is My Food Cost Increasing? The Quiet 3% Creep

Why is my food cost increasing? The honest answer is that it almost never jumps. It creeps. Food cost creeps from four silent causes (supplier price rises, portion drift, stale plate costs, and menu mix), and because most owners check it monthly, you find out a month too late. Nothing changed on the menu, yet there is less left at month-end.

That gap between "nothing changed" and "less money" is the most common money problem in hospitality, and the most invisible. A 3% rise over a quarter is too small to feel on any day and too slow to show up on a single invoice. You see it once it has happened, usually at the accountant's, when the money is gone.

This post walks through where that 3% goes, names each of the four silent causes with the deeper guide on each, then shows why monthly checking finds it late and what catches it sooner. For the full picture, our restaurant COGS guide ties it together.

Food cost doesn't jump, it creeps

Food cost rises in tenths of a percent, not whole points, which is why you don't notice it. A dish that cost 28% to make in January quietly costs 31% by March, and no single week ever looked wrong.

Here is why a small percentage matters. On €60,000 a month in food sales, a 3% rise is roughly €1,800 a month, about €21,600 a year (illustrative — verify before publishing). That is a part-time wage leaking out in amounts too small to spot on a daily total. It stays hidden because none of the four causes announce themselves: they each move the number a little, the same direction, at the same time, and add up to the 3% over a quarter.

Cause 1: supplier price rises you didn't see go up

The most common reason your food cost is increasing is that your suppliers raised their prices and nobody told you in a way you noticed. A delivery note shows a per-kilo price, not a comparison to last month, so a beef price moving from €9.20 to €9.80 a kilo passes straight through to your COGS without a flag.

These rises are rarely announced. They arrive inside the next invoice, often on the items you buy most, and by the time you have signed off twenty delivery notes without comparing them, the increase is baked into every plate you sell. The fix is not to fight every rise, it is to see it the week it lands and reprice or switch before it compounds. Our guide on how to track supplier price increases shows how to catch these in-period.

Cause 2: portion drift on the line

Portion drift is when the food going onto the plate slowly grows beyond the recipe, almost always unintentionally. A generous chef, a new hire who hasn't learned the spec, a "just round it up" scoop of fries, and your portions creep up 10% while your menu price stays flat.

Drift is hard to catch because each plate looks fine. But multiply a fries portion 15 grams heavy across 400 portions a week and across every item, and the kitchen is quietly giving away food cost on volume. Nothing changed on the printout, so it never shows up as a decision, only as a slow bleed. The defence is a written portion spec and a plate cost you measure against, not a feel.

Cause 3: stale plate costs you costed once and forgot

A stale plate cost is a recipe whose ingredient costs you worked out months ago and never updated, so the margin you think you are making no longer exists. You costed the burger at 29% when mince was €8 a kilo. Mince is now €9.40, your spreadsheet still says 29%, and you are pricing and pushing dishes on a wrong number.

This is the quietest cause of all because it lives in your own records, not the kitchen. The plate cost feels like a fact you settled long ago, so you stop questioning it, while every ingredient underneath has drifted and the dish you believe is your best margin is now one of your worst. Our guide on recipe and menu costing keeps plate costs current without a weekend in spreadsheets.

Cause 4: menu mix shifting toward low-margin dishes

Menu mix is what your customers actually order, and when that shifts toward your lower-margin dishes, your blended food cost rises even though no recipe changed. You ran a special, it sold like mad, and it happened to be a high-food-cost item, so your overall percentage went up purely because of what sold, not what anything cost.

This one fools people because it feels like success. The dish is flying out of the kitchen, you are busier than ever, and yet there is less left. Volume on your worst-margin items costs you the same way a price rise does, it just hides behind a good night. The fix is knowing which items carry your margin and steering the mix toward them, which means knowing your real plate costs first, and setting a target with what a good food cost percentage is.

Why is my food cost increasing and I only see it a month late?

You find out late because you check food cost monthly, and a monthly close only tells you about a period that already ended. By the time the figures are in, the 3% has been spent across four to six weeks of service, and there is no service left to fix.

Most owners reconcile when the accountant does, or at month-end with the supplier statements. That cadence was built for tax and bookkeeping, not for catching drift. It tells you the quarter was 3% worse, but not which week it started, which supplier moved, or which dish drifted. The number arrives as a verdict, not a warning.

Weekly checking changes the maths. A creep that started in week two gets caught in week three, while you can still reprice the dish, query the supplier, or retrain the line. To ground this in the numbers, here is how to calculate COGS for a restaurant and food cost percentage.

How to catch it sooner

To catch food cost creep early, you need to see your cost percentage move week to week, against current plate costs, with the cause attached. That means current invoice prices, current recipe costs, and your real sales mix, reconciled often enough to act on.

Done by hand, that is a real job, and most owners start it, manage two weeks, then watch the spreadsheet quietly die during a busy stretch. That is not a discipline failure, it is too much manual work to sustain on top of running the place. Catching a 3% creep in-period needs the reconciliation to run on its own, so all that reaches you is the drift and its cause.

Frequently asked questions

Why is my food cost increasing when nothing changed on the menu?

Because the things that move food cost mostly sit off the menu: supplier prices on your delivery notes, portion sizes on the line, plate costs in a spreadsheet you haven't updated, and which dishes customers happen to order. All four move while the menu stays identical.

How much can food cost creep cost a restaurant?

A 3% rise on €60,000 a month in food sales is roughly €1,800 a month, about €21,600 a year (illustrative — verify before publishing). It hides because it arrives in amounts too small to notice on a single day or invoice.

How often should I check my food cost?

Weekly, not monthly. A monthly close only tells you a period that already ended was worse, while weekly reconciliation catches a creep with service still left to reprice or retrain against.

What are the main causes of rising food cost?

Four silent ones: supplier price increases, portion drift, stale plate costs you costed once and forgot, and menu mix shifting toward lower-margin dishes. They usually move together, which is how they add up.

Is a 3% food cost rise normal?

A slow drift is extremely common, but not something to accept. Each percent leaves real money on the table, and every one of the four causes is fixable once you see which is moving and when.

See the drift the week it starts

Your food cost crept up 3% over a quarter and you found out at the accountant's, when the money was gone. Klar tracks your food cost continuously from your invoices and sales, so you see the drift the week it starts, and names the cause: the supplier line that moved, the dish whose plate cost is stale, the mix tilting toward low margin. Your POS shows what happened. Klar tells you what to do about it.

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