Portion control drives restaurant profitability. Many establishments lose money because portions exceed calculations, causing food costs to rise undetected. A systematic audit reveals exactly where your kitchen bleeds money.
Why portion control matters
You calculate with 200 grams of steak, but your chef serves 250 grams. You lose €3.50 per portion. At 50 portions per week, this costs you €9,100 per year — completely invisible on your books.
A portion control audit pinpoints exactly where money disappears and creates consistency between different cooks.
Setting up your audit
For an effective audit you'll need:
- Digital kitchen scale (accurate to 1 gram)
- Notepad or smartphone for recording
- Your recipes with intended portion sizes
- At least 10 portions per dish to calculate averages
⚠️ Note:
Conduct the audit during normal service, not during quiet moments. Stress and time pressure affect portion size.
Which dishes to check
Start with your 5 top-selling dishes. These have the biggest impact on your profitability. Focus on:
- Main components: meat, fish, main ingredient
- Expensive sides: shrimp, truffle, premium vegetables
- Sauces and dressings: often served too generously
- Garnish: herbs, nuts, cheese
Measurement method per ingredient
Measure each component systematically. After managing kitchen operations for nearly a decade, I've found that cooks consistently overestimate what "looks right" on the plate:
? Example: Steak with fries
Intended recipe vs. reality:
- Steak: 200g intended → 245g actual (+22%)
- Fries: 150g intended → 180g actual (+20%)
- Sauce: 30ml intended → 45ml actual (+50%)
- Salad: 80g intended → 75g actual (-6%)
Cost impact: +€2.85 per portion
Recording and documentation
Note per dish:
- Date and time of measurement
- Which cook prepared the dish
- Intended vs. actual weights
- Percentage deviation per component
- Cost impact in euros
Take photos of the plated dishes for visual reference.
Analyzing results
Calculate the extra costs per dish:
Extra costs = (Actual weight - Intended weight) × Price per gram
? Calculation:
Steak €24/kg, intended 200g, actual 245g:
Extra: (245-200) × €0.024 = €1.08 per portion
At 40 portions/week: €2,246 annual loss
Recognizing patterns
Watch for recurring deviations:
- Specific cooks: does one person consistently serve more?
- Time periods: are portions larger during busy times?
- Ingredients: which components deviate the most?
- Dishes: which dishes have the biggest deviations?
Corrective measures
After the audit you can take targeted actions:
- Training for cooks with the biggest deviations
- Introduce portioning spoons and measuring cups
- Hang visual portioning cards in the kitchen
- Set up weekly spot checks
✅ Immediate result:
Restaurants that implement portion control reduce their food cost by an average of 2-4 percentage points within 3 months.
Digital support
An app like KitchenNmbrs helps you record your audit results and calculate cost impact. You can adjust recipes based on actual portions and immediately see what this means for your food cost.
Frequency of checks
After the first thorough audit:
- Weekly: spot check of 2-3 dishes
- Monthly: full check of your bestsellers
- With new staff: extra checks first month
- Seasonal changes: extra checks for new recipes
How do you conduct a portion control audit? (step by step)
Choose your dishes and prepare
Select your 5 best-selling dishes. Get an accurate kitchen scale and have your recipes with intended portion sizes ready. Plan the audit during normal service for realistic results.
Measure all components systematically
Weigh each part of the dish separately: main ingredient, sides, sauces and garnish. Measure at least 10 portions per dish to get reliable averages. Record everything immediately.
Calculate deviations and cost impact
Compare actual with intended weights and calculate the percentage deviation. Calculate the extra costs using the formula: (actual weight - intended weight) × price per gram. Add up for total impact per dish.
Analyze patterns and take action
Look for patterns: which cooks, time periods or ingredients deviate the most? Set up targeted training, introduce portioning tools and plan regular follow-up checks to maintain consistency.
✨ Pro tip
Audit your weekend dinner service first - that's typically when portions are most inconsistent due to kitchen pressure. Measure 15 plates over a 2-hour window for the most accurate baseline data.
Calculate this yourself?
In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.
Calculate it yourself?
Our free food cost calculator does it in seconds.
Was this article helpful?
Frequently asked questions
How often should I conduct a portion control audit?
What if my cooks feel controlled by the audit?
What deviation is still acceptable for portions?
Do I need to weigh all ingredients or just the main components?
How do I ensure portions stay consistent after the audit?
Should I tell staff beforehand that I'm conducting an audit?
What's the biggest portion control mistake restaurants make?
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
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.
More in this category
Related questions
Explore more topics
Calculate it yourself with KitchenNmbrs
All the formulas you learn here — KitchenNmbrs calculates them automatically. Enter your ingredients and instantly see your food cost, margin, and selling price. Try it free for 14 days.
Start free trial →