If you're running a café or restaurant and your food cost is creeping above 30%, you're not alone. Most independent operators are losing margin in ways they haven't fully diagnosed yet — and the frustrating part is that most of the fixes don't require you to change your menu or your prices. This guide walks through the most common causes of high food cost and what to do about each one.
What is food cost percentage and why does it matter?
Food cost percentage is the ratio of what you spend on ingredients to what you earn from selling them. The formula is simple:
Food cost % = (Cost of ingredients sold ÷ Revenue) × 100
For most cafés and casual dining operators in the UK, a healthy food cost sits between 25% and 32% depending on your offer. If you're above 35%, something is broken — and it's usually one of five things.
The five most common causes of high food cost
1. No portion specs
If your team eyeballs portion sizes, your cost per dish varies every single service. A generous chef or an inconsistent prep routine can silently add 3–5% to your food cost without anyone noticing until it shows in the numbers.
The fix: write a portion spec card for every dish. It doesn't need to be elaborate — weight in grams, a photo of the finished plate, and the cost per portion. Pin it in the prep area and make it non-negotiable.
2. No waste tracking
Waste is the most invisible cost in hospitality. Trim waste, prep errors, over-ordering, and end-of-day spoilage rarely get recorded — so they never get fixed.
The fix: start a daily waste log. A sheet on a clipboard is enough. Track what gets thrown away, why, and how much. Review it weekly. Within a month you'll see patterns — usually one or two products that are consistently over-ordered or have a poor yield.
3. Menu items you haven't costed properly
Most operators cost their menu once, at launch, and never revisit it. But supplier prices change. Portion creep happens. A dish that was profitable at launch can quietly become a loss-maker 18 months later.
The fix: cost every dish from scratch at least twice a year. Calculate your actual cost per portion (ingredients only, not labour) and compare it to the selling price. Any dish below 65% gross margin deserves a closer look.
4. A menu that's too large
More dishes mean more ingredients, more prep time, more waste, and more complexity. Every item you add to your menu introduces a new cost vector that's hard to control.
The fix: run a contribution analysis. Rank every dish by margin × volume. The bottom 20–30% of your menu is almost certainly costing you more than it earns. Remove or simplify those items and your food cost will drop, your prep will tighten, and your team will thank you.
5. Ordering without a par level system
If you order based on gut feel rather than data, you will over-order some things and run out of others. Over-ordering leads directly to spoilage. Running out leads to last-minute purchases at retail prices.
The fix: set par levels for your top 20 ingredients based on average weekly usage. Order against those levels, not against what feels low. Adjust them seasonally. It takes one afternoon to set up and saves a significant amount every week.
A realistic target for improvement
Most operators who work through these five areas can reduce food cost by 4–8 percentage points within 6–8 weeks. On a business turning over £15,000 a month, that's an extra £600–£1,200 dropping straight to the bottom line.
You don't need to do everything at once. Start with portion specs and waste tracking — those two alone will usually close 50% of the gap.
What to measure
- Food cost % — calculate weekly, not monthly
- Waste log totals — reviewed in your weekly manager meeting
- Cost per dish — reviewed every 3 months or when key supplier prices change
- Yield rates on high-usage proteins and produce
The operators who fix food cost aren't the ones who cut ingredients. They're the ones who install the controls that stop waste, enforce portion standards, and review the numbers often enough to catch problems early.
If food cost is a persistent problem in your business, the Performance Builder package at Start Smart is designed to address this directly — including a full menu costing pass and waste control system.