Calculating food cost in a restaurant: where most owners leave money on the table

A dish that's done well on your menu for years can be costing you money instead of making it, if nobody's checked the food cost in a while. With a fixed menu, you're not just checking the margin once for a quote. You sell the same dish night after night, and any slip nobody notices repeats itself just as often.

This article covers how to calculate the cost price per dish, what food cost percentage is healthy for a restaurant, and where the margin most often slips away quietly.

Why food cost works differently in a restaurant than on a quote

With a catering quote, you work out the cost price once, for one event, and then a price goes out the door. With a fixed menu, that's different. You sell the same dish night after night, month after month, and a cost price mistake that's a one-off on a quote repeats itself in a restaurant every single time someone orders that dish.

Changing a price on the menu also feels bigger than adjusting a quote. Guests see it, and changing it too often raises questions. That's why prices on a lot of menus stay unchanged for years, while buying prices have simply kept climbing behind them.

How to calculate the cost price per dish

The basics are the same as for any other cost calculation: add up the buying price of every ingredient in the exact quantity the recipe calls for.

• 180 grams of meat or fish: €2.10
• Vegetables and side: €0.80
• Sauce, herbs, garnish: €0.40
• Total cost price per plate: €3.30

Sell that dish for €19.50, and your food cost comes to just over 17%. The formula always stays the same:

Food cost % = (ingredient cost per plate ÷ selling price) × 100

Do that sum for every dish on the menu separately, not as an average across the whole thing. One popular dish with too thin a margin can eat into the profit of three other dishes without it ever showing up in your total revenue.

Also count what ends up on the plate without being in the recipe. Bread beforehand, an extra spoon of sauce, the garnish the chef adds as standard: that's twenty cents a plate easily, and it adds up fast over a year.

What percentage is healthy for a restaurant?

For a restaurant with a fixed menu, a healthy food cost usually sits between 28 and 35%, a bit higher than on a catering quote, because rent, permanent staff and running stock all have to fit in the rest of your pricing.

• Main courses: often 28 to 32%. The margin in the selling price also has to cover service and the building.
• Starters and desserts: usually lower, 20 to 25%, and that's what offsets the dishes with a tighter margin.
• Drinks and wine: usually well under 30%, which means they contribute relatively more to your overall margin than most dishes.

These are guidelines, not law. More important than a fixed number is knowing where you stand per dish, instead of trusting the feeling that the menu "probably adds up".

Where the margin quietly slips away, dish by dish

Most food cost problems in a restaurant don't start when you put the menu together, they start in the repetition of every single shift:

• Buying prices that creep up gradually without the menu price ever being revisited, sometimes for years.
• Portioning that drifts from the recipe, because the kitchen plates up by feel instead of by weight, and that repeats every single evening.
• "Dead" dishes on the menu that barely get ordered any more, but still cost space, stock and attention.
• Waste that doesn't get counted as a cost, while the plate that comes back or the leftovers that get binned have genuinely cost money.

Each of these points is small on its own. Added up over hundreds of covers a week, they make the difference between a menu that looks good on paper and a restaurant that's busy but barely has anything left at the end of the month.

Keeping an eye on food cost without it becoming a full-time job

Restaurant owners who genuinely keep their food cost under control do two things differently. First, they work out the cost price per dish properly once, and update it as soon as a buying price changes noticeably. So they're not recalculating the whole menu from scratch every time.

Second, they keep a simple overview per dish, with cost price, selling price and food cost percentage side by side. That lets you see at a glance which dish is dragging the margin down and which one is giving you room.

That overview doesn't need to be complicated. One row per dish is already enough to spot patterns: which dishes you should be recommending more, and which ones are better off repriced or taken off the menu.

Set a fixed moment for it, say the start of every quarter. An hour with the supplier list next to you almost always turns up two or three dishes whose price is no longer right.

Frequently asked questions

What's a healthy food cost percentage for a restaurant?

For most restaurants, a healthy food cost sits between 28 and 35%, with starters and desserts usually lower and drinks well below that. More important than a fixed number is knowing where you stand per dish.

How often should I recalculate the cost price on my menu?

At least every quarter, and straight away when a supplier pushes through a noticeable price rise. A lot of menus stay unchanged for years while buying prices keep creeping up, so the margin slowly leaks away without anyone noticing.

Is it okay for a dish on the menu to deliberately run a thin margin?

Yes, as long as you do it deliberately. Some dishes draw guests in or belong to the concept, even with a lower margin. The problem only starts when you don't know which dishes those are and how much they actually cost you.

How do I stop waste from throwing off my food cost?

Track for a few weeks what actually gets thrown away or sent back per dish, and compare that to the planned portion. It's often a portioning issue: the kitchen is consistently plating up a bit more than the recipe calls for. Adjusting the portion size usually fixes that faster than buying in more strictly.

How do I calculate food cost for a dish with a changing daily price?

Work with the highest buying price you've paid in the past year, not the average. That way you're still covered in an expensive season, and you keep something back in a cheap one. For fish and fresh vegetables, that can easily shift food cost by a few per cent per plate.

Should I include staff and gas in my food cost?

No, food cost only covers the ingredients on the plate. Wages, rent and energy belong in your overall cost picture, but putting them into food cost means you can no longer compare dishes against each other.

Catermonkey works out the cost price of a dish straight from your recipes, and puts cost price, selling price and food cost percentage side by side. If a buying price changes, you see straight away which dishes fall below your margin because of it.

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