Ever wonder why your food costs keep climbing despite getting better supplier deals? Most restaurant owners obsess over purchase prices while their real profits vanish through uncontrolled kitchen exits. You're fighting the wrong battle entirely.
Where your profit disappears without you noticing
You've got purchasing locked down tight. Every supplier invoice gets scrutinized. But can you tell me exactly how many grams hit each plate? Or what percentage lands in your dumpster?
💡 Example:
You buy beef for €24/kg. You calculate 200 grams per portion = €4.80 per steak.
- Chef cuts 220 grams (generous): €5.28
- 10% cutting loss from trimming: €5.81
- Actual cost price: €5.81 instead of €4.80
Difference: €1.01 per steak. At 50 steaks/week = €2,626/year
The 5 biggest leaks in your kitchen
1. Portion size chaos
Your line cooks eyeball everything. Tuesday's chicken breast weighs 180 grams, Friday's weighs 250. Nobody's measuring, everyone's guessing.
2. Hidden cutting losses
That whole salmon costs €18/kg, but after filleting you've lost 45% to bones and skin. Your actual fillet price? €32.73/kg, not €18.
⚠️ Watch out:
Many owners calculate wrong: "45% loss = €18 × 0.45 = €8.10/kg". Nope! Less usable product means higher cost: €18 ÷ 0.55 = €32.73/kg.
3. The garnish trap
You price the protein but forget everything else. Butter, herbs, vegetables, sauces - they're adding €2-3 per plate to costs you never calculated.
4. Prep waste spiral
Over-prepping, poor storage, forgotten leftovers. What gets tossed makes everything else more expensive to serve.
5. The black box kitchen
You know what went in, but not what came out. That gap between purchased kilos and served portions? That's where profit dies. This is a pattern we see repeatedly in restaurant financials - owners who can recite every supplier price but can't tell you their actual plate costs.
💡 Example:
You buy 10 kg of ground beef for €60. Should yield 50 burgers at 200g each.
- Sold: 45 burgers
- Missing: 5 burgers = 1 kg ground beef = €6
- Culprits: oversized portions, waste, or worse
Weekly loss: €6. Annual damage: €312 on one ingredient alone
Why purchasing control falls short
You can negotiate the sharpest buying prices in town. But without exit controls, you're still bleeding money.
- Purchasing shows what you paid
- Portions reveal what you're actually earning
- That gap determines your real margins
Most owners fixate on the wrong metric. They'll spend hours shaving 50 cents off ingredient costs while losing euros daily through kitchen carelessness.
How to plug these leaks
The fix isn't rocket science: track what exits, not just what enters.
Target your 3 top sellers first:
- Weigh 10 actual portions, calculate the average
- Include every garnish and side component
- Track weekly portion sales
- Match against ingredient purchases
💡 Control example:
Pasta carbonara tracking - last week:
- Portions sold: 80
- Ingredients purchased: enough for 85 portions
- Variance: 5 portions = 6% loss
That's manageable. Hit 10%+ and you need answers.
Food cost software can automate this tracking, instantly comparing recipe theory against consumption reality.
How do you get control of outgoing portions? (step by step)
Measure your actual portion size
Weigh 10 portions of your best-selling dish and take the average. Include all garnishes, sauces and side dishes. This is your actual cost price per portion.
Compare purchasing with sales
Count how many portions you can theoretically make with your purchases. Compare this with how many you actually sold. The difference is your loss.
Find the cause of differences
With more than 10% difference you investigate: too large portions, waste, incorrect storage or theft. Fix the biggest cause first.
✨ Pro tip
Track your top 3 dishes for exactly 2 weeks: compare portions sold against ingredients purchased. Any growing variance signals kitchen drift before it damages your bottom line.
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 often should I check my portion size?
Start with weekly checks for your top 3 dishes. Once they're consistent, shift to monthly monitoring. Always increase frequency with new staff or menu additions.
What's an acceptable loss percentage?
Expect 5-10% loss from cutting waste and minor spillage. Above 15% demands investigation. Fresh seafood and whole proteins naturally run higher due to processing waste.
Do I need to weigh everything in the kitchen?
Focus on your 3-5 bestsellers first - they typically drive 60-80% of revenue. Master those and you've solved your biggest profit leaks.
What if my chef resists portion monitoring?
Frame it as pricing intelligence, not performance policing. Oversized portions mean underpriced dishes - tracking helps set fair market rates while maintaining quality standards.
📚 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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