How to spot a 10% profit leak in your menu

Your bestsellers are costing you more than you think

A dish that sells 50 times a week at £12 a head looks like a winner. But if its food cost is 40%—£4.80 per plate—it’s only making £7.20 profit. Now multiply that by 50, then by 52 weeks, and you’re staring at a £18,720-a-year hole. The problem isn’t the sales; it’s the maths hiding in plain sight.

Most operators spot the obvious: a £20 burger with £8 of food cost is a disaster. But the real leaks are in the items that seem profitable. A £10 pasta dish with £3 of ingredients looks fine—until you realise it takes 20 minutes to cook, ties up a chef for that time, and the labour cost eats half the profit. Or a £15 salad that’s popular with lunch crowds but requires a specialist supplier, extra prep, and a fridge that’s always half-empty by close.

The fix isn’t to cut the item—it’s to see it for what it is: a channel problem, not a menu problem. That pasta might be fine as a dine-in special, but it’s bleeding money on delivery. That salad could work if you batch-prep it on Mondays and Wednesdays, not every morning. The question isn’t ‘Should we keep this?’ but ‘Where does it make money, and where does it drain it?’

Start with the Contribution Margin per Item report. This isn’t your standard food-cost percentage—it subtracts all the costs tied to that dish: ingredients, labour, packaging, delivery fees, and even the time it sits in the pass before a rider grabs it. If you’re not tracking this, you’re flying blind. Reports & Analytics shows you how to pull it without a spreadsheet.

The hidden cost of ‘popular’ items

A dish that sells well isn’t always a good deal. Take a £14 burger that’s your top seller—until you dig into the numbers. At 35% food cost, that’s £4.90 spent on ingredients, leaving £9.10 gross profit. But:

• Labour: If it takes 12 minutes to cook and your chef earns £15 an hour, that’s £3 per burger in wages (£1.20 for the chef, £1.80 for the person who flips the patty, etc.).
• Packaging: A delivery box, napkins, and a straw add £0.80.
• Delivery fee: If the marketplace takes 25% of £14, that’s £3.50 gone before you even see the order.
• Waste: 15% of burgers get remade because the patty burns or the bun gets soggy. That’s £2.10 extra per order.

Suddenly, your ‘£9.10 profit’ burger is costing you £1.10 per sale. Scale that up to 100 orders a day, and you’re losing £110 before tax—every single day. The item itself isn’t the issue; it’s the context you’re not accounting for.

Here’s the rule: If an item’s contribution margin drops below 50% after all costs, it’s not a bestseller—it’s a money pit. And the worst part? You won’t see it in your daily sales report. You need to run the Channel Breakdown report to see which sales channels (dine-in, delivery, pickup) are making—or losing—money on each dish. The 3 Reports Every Restaurant Owner Must Run Weekly shows how to set this up in under 10 minutes.

The second-order effect: what ‘fixing’ a menu item actually breaks

You find a £12 pasta dish that’s costing you £3 per order after all expenses. The obvious fix is to raise the price to £15. But here’s what happens next:

1. Volume drops. Your regulars—who ordered it because it was ‘cheap’—now think it’s overpriced. Sales fall by 20%. Your £3 loss per order becomes a £0.60 loss, but you’ve also lost the £3 gross profit you were making before.
2. The kitchen slows. You tell your chefs to rush the pasta to keep up with demand. Now you’re paying for overtime, and the quality drops—so customers complain.
3. The marketplace penalises you. You raise the price on the app, but the algorithm flags it as ‘too expensive’ and buries your listing. Delivery orders drop by 30%.

The fix wasn’t the price—it was the workflow. That pasta was losing money because:

• It required hand-cut noodles, which took twice as long as dried.
• The sauce was made fresh daily, but half of it went to waste.
• It was only profitable as a dine-in item; delivery ate the margin.

The solution?

• Swap hand-cut for dried noodles (saves 10 minutes per order).
• Pre-make the sauce in batches (cuts waste by 40%).
• Offer it as a ‘dine-in only’ special (avoids delivery fees).

Now the £12 dish makes £4 profit instead of losing £3—and you didn’t alienate a single customer.

How to test a menu change without guessing

Before you tweak a menu, run a 7-day pilot. Here’s how:

1. Isolate the test. Pick one item, one branch, and one channel (e.g., delivery-only on Wednesdays). Don’t change everything at once.
2. Track the right numbers. Use the Real-Time Sales by Item report to monitor:

• Orders per day (volume).
• Average spend per order (price sensitivity).
• Contribution margin (profit per order).
• Customer feedback (complaints or praise in reviews).

3. Compare apples to apples. If you’re testing a price rise, run it for a full week and compare it to the same week last month. Use the Branch Comparison tool to strip out seasonality. How to Compare Branch Performance Fairly walks you through it.
4. Watch for spillover. If you raise the price of a burger, do customers switch to a cheaper sandwich? If you cut portion sizes, do they order two instead of one? The Menu Modifier Impact report shows where cross-selling helps—and where it hurts.

Example: A café tested raising the price of their £4.50 flat white by 20% to £5.40. They expected a 10% drop in sales—but instead, they saw:

• Dine-in orders fell by 8% (customers switched to tea or coffee).
• Delivery orders rose by 12% (the app’s algorithm boosted higher-priced items).
• Net profit per order increased by 30% because the delivery channel had higher margins.

The fix? Keep the price rise for delivery-only and offer a loyalty discount for dine-in regulars. No guesswork, just data.

The 3 reports that find profit leaks before they cost you

You don’t need a degree in accounting—you need three reports that show you where money walks out the door. Run these weekly, not monthly:

Report	What It Finds	How to Act
Contribution Margin by Item	Which dishes lose money after labour, packaging, and fees.	Cut, repurpose, or reprice the worst 20%.
Channel Breakdown	Which sales channels (dine-in, delivery, pickup) are profitable—and which aren’t.	Stop pushing unprofitable channels. Offer incentives for profitable ones.
Peak-Hour Waste	Which items get remade most often during busy periods.	Simplify prep, cross-train staff, or drop the item entirely.

Pro tip: The Peak-Hour Waste report isn’t just about food cost—it’s about time. A dish that takes 15 minutes to make in a quiet kitchen might take 30 minutes during a rush. That’s not a food-cost issue; it’s a labour-cost time bomb. If you’re paying £15/hour wages, that’s £7.50 extra per order during peak times—money you’re not seeing in your reports.

What to do when the numbers don’t add up

Sometimes the maths points to one fix, but the kitchen says it’s impossible. Example:

• Report says: Your £10 chicken wrap has a 45% contribution margin—too low.
• Kitchen says: ‘We can’t raise the price because the chicken supplier just hiked costs by 15%.’

Here’s the step-by-step fix:

1. Negotiate the supplier. Ask for a bulk discount or a fixed-price contract. If they won’t budge, find a secondary supplier for 30% of your orders.
2. Reduce portion sizes. Cut the chicken by 10% (customers won’t notice if the bread and sauce stay the same).
3. Upsell a modifier. Add a £1 ‘spicy mayo’ option—most customers will take it, adding £1 to the order without extra cost.
4. Drop the delivery channel. If the wrap only makes money dine-in, stop offering it on apps. Use the Channel Profitability dashboard to see where to pull back.

Result: You’ve improved the margin without raising prices, losing customers, or slowing the kitchen.

Frequently asked questions

How do I know if a menu item is really losing money?

Run the Contribution Margin by Item report and filter for items with a margin below 50%. Then cross-check with your Peak-Hour Waste report—if the same items show up in both, they’re the ones to fix first. Don’t rely on gut feel; the kitchen might love making a dish, but if it’s costing you £2 per order, it’s a liability.

What if raising prices scares off customers?

Test the price rise for one week only, on one channel (e.g., delivery). Use the Real-Time Sales report to track volume drops. If sales fall by more than 10%, either lower the price slightly or offer a loyalty discount to soften the blow. The goal isn’t to raise prices forever—it’s to find the sweet spot where profit goes up and customers stay.

Can I fix a low-margin item without changing the menu?

Yes—often the fix is in the prep or the workflow. For example:

• Batch-cook components (e.g., pre-chop veggies for salads on Mondays).
• Simplify recipes (swap fresh herbs for dried, or use pre-marinated meat).
• Repurpose ingredients (use leftover roast chicken for wraps the next day). The Inventory Variance report shows where food waste is highest—those are your targets.

What if my bestsellers are all losing money?

This means your menu mix is wrong. Start by:

1. Dropping the bottom 20% of items by margin.
2. Repricing the middle 30% to hit a 60%+ contribution margin.
3. Promoting the top 10%—these are your profit drivers. Use the Bestsellers by Channel report to see which items make money in which settings, then push those harder.

How often should I review my menu for profit leaks?

Monthly for high-turnover items, quarterly for staples. But set a calendar reminder for the first week of every month to run the Contribution Margin and Channel Breakdown reports. A leak that’s £500 a month becomes £6,000 a year—don’t let it fester.

Check your Contribution Margin by Item report today. If you’re not tracking this, you’re leaving money on the table—literally. Reports & Analytics has the tools to spot the leaks; now it’s up to you to plug them.