How to Calculate Food Cost for Your Menu (Simple Method)

You know your restaurant needs to be profitable, but do you actually know the exact cost of every dish you serve? Many restaurateurs set their prices "by gut feeling" or by looking at what competitors charge, without truly calculating their food cost. The result: dishes that seem profitable but are quietly eating into your margins without you realising.

Food cost represents the total cost of ingredients needed to produce a dish. It's the fundamental metric for setting your selling prices and ensuring your establishment's profitability. Here's how to calculate it simply, without needing to be a qualified accountant.

Why calculate the food cost of every dish?

Before diving into the numbers, let's understand why it's essential:

To set fair prices: A price that's too low loses you money. A price that's too high drives customers away. Food cost gives you a solid foundation for striking the right balance.

To identify your most profitable dishes: Not all your dishes are equal. Some have comfortable margins, while others cost you more than they bring in. Calculating food cost lets you know which ones to promote.

To negotiate with your suppliers: Knowing your costs down to the penny gives you concrete leverage when negotiating purchase prices.

To adapt your menu: If an ingredient becomes too expensive, you can adjust portions, find an alternative, or temporarily remove the dish.

The 4-step method

Step 1: List every ingredient in the dish

Let's take a concrete example: a homemade burger.

Write down every ingredient used, even the smallest ones:

• Burger bun (1 piece)
• Beef patty 150g
• Cheddar (2 slices, 40g)
• Tomato (3 slices, 30g)
• Lettuce (20g)
• Red onion (15g)
• Gherkins (20g)
• House sauce (30ml)
• Homemade chips (200g raw potatoes)
• Frying oil (portion)

Don't forget the small items: cooking oil, salt, pepper, herbs. Even if they seem negligible, they add up over hundreds of services.

Step 2: Note the purchase price and weight/volume

For each ingredient, note:

• The purchase price (what you pay your supplier)
• The pack size (e.g. 1kg, 500g, 1L, etc.)
• The unit price (purchase price ÷ pack size)

Example for our burger:

Tip: Create a reference file with all your ingredients and their unit prices. Update it whenever your suppliers change their rates.

Step 3: Calculate the cost of each ingredient in the dish

Multiply the quantity used by the unit price.

For our burger:

Total food cost: £3.15

Step 4: Calculate your food cost ratio

The food cost ratio is calculated as follows:

Food cost ratio = (Food cost / Net selling price) × 100

If you sell this burger for £12.50 including VAT (i.e. £10.42 net of 20% VAT):

Ratio = (3.15 / 10.42) × 100 = 30.2%

What food cost ratio should you aim for?

There's no magic number that works for everyone, as it depends on your concept, your location, and your fixed costs. But here are some benchmarks:

• 25–30%: Excellent ratio, comfortable margins (typical for pizzerias, burger joints, pasta restaurants)
• 30–35%: Good ratio, standard for traditional restaurants
• 35–40%: Acceptable, but watch your other overheads
• 40% and above: Danger zone — your margins are too thin

Important: This ratio only accounts for ingredients. You also need to cover:

• Staff costs (30–35% of turnover)
• Rent and rates (10–15% of turnover)
• Other expenses (energy, marketing, maintenance: 10–15% of turnover)
• Your profit margin (10–15% of turnover)

If your food cost exceeds 35%, you'll struggle to cover all these overheads.

Free spreadsheet to calculate your costs

Create a simple spreadsheet with these columns:

Add automatic formulas for the totals and the ratio. In 30 minutes, you'll have a tool you can use for years.

Common mistakes to avoid

Not accounting for waste: A 150g raw steak weighs around 120g once cooked. A spoiled vegetable that gets thrown away is money lost. Add 5–10% for waste.

Forgetting the small costs: Oil, salt, herbs... over 100 dishes, that adds up to several pounds.

Not updating prices: Your suppliers raise their rates regularly. Recalculate your costs at least once a quarter.

Setting prices based solely on food cost: Food cost is one indicator, not the only criterion. A dish with an excellent ratio that barely sells isn't helping your bottom line.

What to do when food cost is too high?

You've done the maths and found that a popular dish has a 45% ratio? Here are several solutions:

Adjust portions: Slightly reduce the quantity of the most expensive ingredient (e.g. go from 150g to 130g of meat).

Swap an ingredient: Find a cheaper supplier or an equivalent alternative.

Raise the price: If your dish is a customer favourite, an increase of £0.50 to £1 may well be acceptable.

Remove the dish: If nothing works and the dish doesn't sell well, replace it with something more profitable.

Repackage it: Create a set menu where this less profitable dish is offset by a starter or dessert with a high margin.

Your action plan for tomorrow

Pick your 3 best-selling dishes and calculate their food cost using the method above. In just a few hours of work, you'll have a clear picture of the profitability behind 50–70% of your turnover.

Note down the results and ask yourself these questions:

• Which dish has the best ratio? (Promote it!)
• Which dish has the worst ratio? (Can it be optimised, or should it be removed?)
• Is my current selling price consistent with my actual costs?

Knowing your food costs isn't just a matter of bookkeeping. It's about understanding where your money goes and taking back control of your profitability. And that changes everything.