Two consecutive weeks of declining margins signal money leaking from your restaurant. While occasional dips happen, consistent drops point to specific problems. Stop the bleeding fast with systematic detective work.
Check your food cost per dish
Start with your volume sellers. These dishes drive your overall margin - if they're bleeding money, you'll feel it fast.
💡 Example:
Your steak sells 80 times per week for €32.00 (incl. 9% VAT):
- Selling price excl. VAT: €29.36
- Ingredient costs last month: €9.50
- Ingredient costs now: €11.20
Food cost rose from 32.4% to 38.1% - that costs you an extra €136 per week!
Scrutinize your supplier invoices. Meat, fish, and dairy creep up without warning - sometimes 15-20% in a single month.
Analyze your purchasing pattern
Buying more than you're selling? Your inventory swells while margins shrink.
- Week 1: Sales €8,000, purchases €2,800 (35% of revenue)
- Week 2: Sales €7,500, purchases €3,200 (43% of revenue)
- Signal: You're over-purchasing for your actual volume
⚠️ Watch out:
Healthy purchasing runs 25-35% of revenue. Above 40% means you're buying too much or paying too much.
From analyzing actual purchasing data across different restaurant types, I've seen this pattern destroy margins faster than any other factor.
Check waste and loss
Waste kills margins silently. More trash means higher costs with zero revenue to show for it:
- Spoiled products from over-ordering
- Botched dishes from inexperienced staff
- Oversized portions during rush periods
- Poor knife skills creating unusable scraps
💡 Example:
You discard €25 of spoiled vegetables daily:
- Per week: €175
- Per month: €700
- Per year: €9,100
That's 1.8% of a €500,000 revenue - eliminate the waste.
Check your selling prices vs. the market
Maybe you're underpricing in today's market. Survey 3-5 comparable spots nearby.
- What do they charge for similar dishes?
- How long since your last price increase?
- Which items can absorb a €2-3 bump?
Analyze your labor costs
Extra hours from new hires or inefficient processes squeeze margins hard.
💡 Example:
Last month: 180 kitchen hours at €8,000 revenue = 22.5%
This month: 220 kitchen hours at €8,000 revenue = 27.5%
That extra 5% in labor costs you €400 monthly.
Create an action plan
Found the culprit? Attack it immediately:
- Higher purchases: Increase prices or source cheaper suppliers
- Excessive waste: Order less, improve staff training
- Inefficiency: Streamline workflows, reduce overlapping shifts
- Underpricing: Bump prices on high-margin items
⚠️ Watch out:
Don't wait for month-end numbers. Each delayed week costs hundreds in continued losses.
A dashboard system tracks these trends automatically, eliminating manual calculations and comparisons.
How do you tackle declining margins? (step by step)
Check food cost of your top sellers
Calculate the food cost of your 5 best-selling dishes. Compare with last month. An increase above 2 percentage points is a problem.
Analyze purchases vs. sales
Divide your weekly purchases by your weekly revenue. Above 35% means you're buying too much or too expensive. Check supplier prices and ordering frequency.
Measure waste and loss
Track what gets thrown away for 3 days. Add up the value. More than €20 per day at normal revenue is too much.
Compare your prices with competitors
Check 3-5 comparable restaurants. Are you more than 10% below their prices? Then you can probably raise prices without losing customers.
Create an action plan and execute it
Tackle the biggest cost item first. Raise prices, switch suppliers, or train staff. Measure the effect after 1 week.
✨ Pro tip
Track your weekly food cost percentage every Tuesday at 9 AM for the previous 7 days. If it jumps 3+ points above your target, spend that afternoon finding the cause - waiting costs you €200-500 per week in continued losses.
Calculate this yourself?
In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.
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Frequently asked questions
How do I know if 2 weeks of declining margin is really a problem?
If your margin drops more than 3 percentage points without clear reasons like seasonality or renovations, it's serious. Don't wait beyond 2 weeks to investigate and act.
What if my supplier suddenly raises prices by 20% on key ingredients?
You've got three moves: negotiate payment terms to spread the impact, find alternative suppliers immediately, or raise menu prices on affected dishes within 48 hours. Speed matters here.
Should I cut staff hours first or raise prices first when margins drop?
Check your labor percentage first - if it's above 32% of revenue, optimize scheduling before touching prices. If labor's normal but food costs spiked, adjust prices immediately.
📚 Sources consulted
- EU Verordening 852/2004 — Levensmiddelenhygiëne (2004) — Official source
- EU Verordening 853/2004 — Hygiënevoorschriften voor levensmiddelen van dierlijke oorsprong (2004) — Official source
- EU Verordening 1169/2011 — Voedselinformatie aan consumenten (2011) — Official source
- NVWA — Hygiënecode voor de horeca (2024) — Official source
- NVWA — Allergenen in voedsel (2024) — Official source
- Codex Alimentarius — International Food Standards (2024) — Official source
- FSA — Safer food, better business (HACCP) (2024) — Official source
- BVL — Lebensmittelhygiene (HACCP) (2024) — Official source
- Warenwetbesluit Bereiding en behandeling van levensmiddelen (2024) — Official source
- WHO — Foodborne diseases estimates (2024) — Official source
Food Standards Agency (FSA) — https://www.food.gov.uk
The HACCP standards shown in this application are for informational purposes only. KitchenNmbrs does not guarantee that displayed values are current or complete. Always consult the FSA or your local authority for the latest regulations.
Written by
Jeffrey Smit
Founder & CEO of KitchenNmbrs
Jeffrey Smit built KitchenNmbrs from 8 years of hands-on experience as kitchen manager at 1NUL8 Group in Rotterdam. His mission: give every restaurant owner control over food cost.
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