A pizza can look busy at £9.99 and still leave very little in the till. A loaded burger may sell all day, but if the patty, bun, cheese, sauce, chips and box are not measured properly, it can quietly drain profit. Knowing how to calculate food costs turns every menu price into a commercial decision instead of a guess.
For independent takeaways, food cost control is not about serving smaller portions or buying the cheapest product. It is about costing the portion you actually serve, buying intelligently, and charging a price that leaves room for wages, rent, energy, delivery platform fees and profit. Get the numbers right and you can spot your real fast sellers, protect margin during supplier price rises, and run stronger offers without giving away the shop.
How to calculate food costs per portion
Start with the true cost of every ingredient in one serving. This is the foundation for pizza, kebab, burger, fried chicken, milkshake and dessert pricing.
Use this formula:
Ingredient cost per portion = pack cost ÷ usable quantity in the pack × portion size
Say a 10kg bag of fries costs £18.00. Once cooking loss and waste are considered, you may get 9.5kg of usable fries. If your regular portion is 180g:
£18.00 ÷ 9,500g × 180g = £0.34 per portion
That 34p belongs on your menu costing sheet. Do the same for every component, then add them together.
A smash burger, for example, might include a beef patty, brioche bun, cheese slice, burger sauce, onions, pickles, a fries portion and a burger box. The burger is not just the patty. If the full build costs £2.72, that is your food cost per meal before you consider labour and operating costs.
Be precise with the units. If you buy cheese by the kilo but portion it by grams, convert everything to grams. If sauce comes in a 2-litre bottle and you use 25ml, work in millilitres. A digital scale and portion scoops are not fussy kitchen extras. They are margin tools.
Cost the usable product, not just the case price
The price on an invoice is only the starting point. Some products have trim, cooking shrinkage, damaged pieces or product left in the bottom of a bottle. A 5kg chicken case does not always produce 5kg of saleable cooked chicken. A whole salad bag may include waste. Oil has a working life, but it still needs changing and topping up.
For high-volume items, build a realistic yield into the calculation. If 1kg of raw chicken gives 800g after coating, frying and normal handling, use 800g as the usable quantity. Otherwise, your costing will look healthy on paper and disappoint at the end of the week.
This does not mean loading every calculation with worst-case waste. Track a normal week, then use the average. Your aim is an honest number that reflects your kitchen during a busy Friday night.
Include packaging, dips and the extras customers expect
A common mistake is costing the main food and ignoring everything around it. In takeaway trade, the bag, box, cup, lid, napkins, sauce pots and delivery seal all come out of the same sale.
If your chicken meal includes a box at 18p, a dip pot at 9p, a napkin at 2p and a carrier bag at 7p, add 36p to the item cost. It may not sound like much, but across 300 orders a week it is £108. That is real money, not a rounding error.
The same applies to complimentary sauces, salad, seasoning and drink ice. Either control the portion, include it in the product price, or make it a paid upgrade. “Free” is only free to the customer.
For a pizza, cost the base, sauce, cheese, every topping, seasoning sachet, pizza box and any dip included in the deal. For a kebab, include the pitta or naan, meat, salad, sauces, wrapping, tray and bag. Build costs as the customer receives them, not as the kitchen first prepares them.
How to calculate food cost percentage
Once you know the full portion cost, calculate the percentage of the selling price it takes up.
Food cost percentage = food cost per portion ÷ selling price × 100
If a fully costed burger meal is £2.72 and you sell it for £9.50:
£2.72 ÷ £9.50 × 100 = 28.6% food cost
That means 28.6p of every £1 sold is spent on the food and packaging in that meal. The remaining 71.4% is your gross profit contribution. It still has to cover everything else in the business, so it is not pure profit.
There is no single perfect food cost percentage. A simple soft drink may run at a very low percentage. A premium loaded pizza with quality cheese, meat toppings and a heavy box may be higher. Your target depends on your rent, staff bill, delivery model, local competition, VAT position and the price customers will realistically pay.
Many fast-food operators aim for a food cost around 25% to 35% on core menu items, but use this as a starting range rather than a rule. A 40% cost may work for a headline deal that drives profitable add-ons. A 25% cost is not automatically good if the menu price is too low to cover your overheads.
Set a selling price from your target margin
When you know your target food cost percentage, reverse the formula:
Selling price = food cost per portion ÷ target food cost percentage
If your kebab meal costs £3.15 and your target food cost is 30%:
£3.15 ÷ 0.30 = £10.50
You could price it at £10.49, £10.50 or £10.99 depending on your menu structure and local market. Do not automatically round down because a nearby shop has a cheaper price. Compare what the customer gets: portion size, meat quality, sides, packaging, speed and brand reputation all affect what a menu can carry.
Also check whether your calculation should be before or after VAT. If you are VAT registered and the item is subject to VAT, your net sales value matters for margin planning. This is one area where a bookkeeper or accountant can prevent expensive errors, especially where hot food, cold products and delivery charges are treated differently.
Build recipe cards that staff can follow
A costing sheet is only useful if the kitchen produces that exact portion. Write a recipe card for each menu item with the product, weight or count, preparation method and packaging. “Handful of cheese” is not a portion. “110g grated mozzarella” is.
Keep it practical. Put the card where staff build the item and use easy measures that match the station: one level scoop, two 57g patties, 180g fries, 30ml sauce. Train the team on why the standard matters. Over-portioning by 20g on cheese or fries can wipe out the margin you thought you had.
Check portions at random, particularly when a new team member starts or service gets hectic. The goal is consistency for the customer as well as control for the business. A customer should get the same good pizza on Tuesday afternoon as they do at midnight on Saturday.
Review your costs when buying prices move
Food costs are not a one-time setup job. Cheese, chicken, cooking oil, packaging and sauces can all move in price. A small increase across a high-volume line can change your weekly gross profit quickly.
Review your best sellers at least monthly, and sooner when a key supplier price changes. Focus first on the products you sell most: your top pizza, biggest burger meal, regular kebab, loaded fries, wings bucket and meal deals. A 15p cost increase on an item selling 500 times a week is £75 off your margin before you have changed a single menu price.
Buying in sensible bulk can lower the unit cost, but only when you have storage, cash flow and a reliable sales rate. A cheaper case is not a saving if it goes out of date, gets freezer-burned or ties up money needed for faster-moving stock. Use case deals and bundle pricing on lines you genuinely turn over. ADZ Foods is built around this kind of trade buying - products that fit the menu and pack sizes that make commercial sense.
Track actual food cost, not just theoretical cost
Recipe costing tells you what food cost should be. Stocktaking tells you what it actually is.
At the end of a week or accounting period, use:
Actual food cost percentage = opening stock + purchases - closing stock ÷ food sales × 100
If you start with £4,000 of stock, buy £6,000, finish with £3,500 and take £22,000 in food sales, your actual food cost is:
£4,000 + £6,000 - £3,500 = £6,500 used
£6,500 ÷ £22,000 × 100 = 29.5%
If your recipes predict 27% but actual cost is 31%, investigate the gap. It could be over-portioning, waste, staff meals, unrecorded discounts, theft, inaccurate stock counts or products being used on the wrong menu item. Do not assume it is one big problem. It is often several small leaks.
Count high-value stock carefully: meat, cheese, cooking oil, branded drinks, premium sauces and packaging. Keep purchase invoices, record waste, and make staff meals visible rather than letting them vanish into stock usage. The numbers become far more useful when the process is consistent.
A strong menu is not the one with the highest price or the cheapest ingredients. It is the one that customers reorder and that pays its way every time it leaves the counter. Cost your best sellers this week, tighten one portion that is drifting, and let the till show you the difference.
