Food Cost Running Above 32%? Here's Why — and How to Fix It Fast

The silent margin killer nobody talks about#

A busy Friday night feels like success. Covers full, kitchen humming, card machine beeping every 90 seconds. But when the month-end numbers land, the profit is somehow £3,200 — on £62,000 of revenue. That is a 5.2% net margin. The culprit is almost always food cost percentage. Industry benchmarks put it at 28-32% for full-service restaurants. Above that, every extra percentage point on £60K monthly revenue costs you £600/month — or £7,200 a year — straight off the bottom line. Most restaurant owners do not track food cost weekly. They find out at month-end, three weeks after the problem started. By then, the bad invoices are paid, the portion violations are forgotten, and the waste has gone in the bin.

Five reasons food cost runs away#

First: portion drift. Staff ladle an extra 30g of protein per dish. At £18/kg that is £0.54 per cover. Over 2,000 covers a month, that is £1,080 you never see. Second: supplier price creep. Your chicken breast agreed at £4.20/kg quietly becomes £4.80/kg on invoice three. You sign the delivery note and miss it. Third: waste with no tracking. Prep waste, spoilage, and mis-fires are not recorded anywhere. Fourth: menu mix shift. Cheaper dishes with higher food cost percentages start outselling your premium items. Fifth: theft. Industry research suggests 4-7% of food loss in restaurants involves staff taking product. None of these are visible without real-time data.

What "theoretical food cost" means and why you need it#

Theoretical food cost is what your food cost should be, based on your recipes and sales mix. If your POS says you sold 340 portions of fish and chips at a recipe cost of £4.20 each, theoretical cost is £1,428 for that dish. If your actual stock usage for the same dish was £1,890, you have a £462 variance — roughly 24% waste or loss. AskBiz calculates theoretical food cost automatically from your recipe library and your sales data. It compares it to your actual purchases daily. If the gap widens, you get an alert. You know about the problem on Tuesday, not on the last day of the month.

How AskBiz POS connects recipes to purchasing#

You build your recipes in AskBiz once — every ingredient, every weight, every unit cost. When a dish fires on the POS, AskBiz deducts the theoretical ingredients from stock automatically. When a supplier invoice arrives, AskBiz matches it to the purchase order and flags any price variance above 3%. It integrates with Xero and QuickBooks so your food cost appears on your P&L in real time, not at month-end. You can filter by dish, by supplier, by day of week, by location. If the kitchen on Wednesday lunches is burning 40% food cost but Friday dinner is 28%, that is visible in two clicks.

Before and after: a UK casual dining group#

A four-site casual dining group in the Midlands was running 36.4% food cost across the estate. They had no recipe management system, no weekly stock counts, and no supplier price alerts. After connecting AskBiz POS to their purchasing and stock module, they identified: £1,200/month in supplier price drift that nobody had flagged, £800/month in portion overuse on three high-volume dishes, and one site running 42% food cost because pre-prep was being over-produced and scrapped daily. Within 90 days, group food cost dropped to 30.1%. That is 6.3 percentage points on £180,000 monthly group revenue — £11,340/month recovered. Annual impact: £136,000.

Three quick wins you can action this week#

One: count your top-10 highest-value stock items every week, not every month. Even a manual count in a spreadsheet will surface variances. Two: pull every supplier invoice from the last 60 days and compare the price-per-unit to what you agreed at the time of ordering. Supplier price creep is almost always there. Three: ask your chef to plate three portions of your top three dishes on a scale and photograph them. Compare to the recipe card. Portion drift shows up within minutes. These are free fixes. AskBiz automates all three, but you do not need the software to start. You need the habit of looking.

The cost of doing nothing#

If your food cost sits at 35% when it should be 30%, and your monthly food revenue is £60,000, you are paying £3,000 extra per month for the same output. Over 12 months that is £36,000 — enough to hire a part-time sous chef, refurbish your bar, or fund six months of marketing. Food cost is not a number your accountant tracks. It is a daily operational discipline. The restaurants that sustain 28-30% food cost do not have magic suppliers — they have daily visibility into what is being used, bought, and wasted.

• If your food cost percentage is creeping above 30-32%, you are probably losing £4,000-£8,000 a month you cannot see.
• This article breaks down why it happens and how AskBiz tracks it in real time so you can act before the month-end P&L hits.