Restaurants lose an average of 15% profit margin when they can't accurately predict sauce portion yields. Oversized servings drain profits while undersized ones frustrate customers. Here's how to calculate precise sauce costs and track them effectively.
Why portion uncertainty destroys your margin
A hollandaise batch costs €12 in ingredients. You get 20 portions? Maybe 25? Could be 30? This uncertainty means you're paying anywhere from €0.40 to €0.60 per portion.
💡 Example:
Hollandaise batch at €12 ingredients:
- 20 portions: €0.60 each
- 25 portions: €0.48 each
- 30 portions: €0.40 each
That €0.20 difference equals €1,040 annually at 100 portions weekly
The hidden costs of guessing
Without exact portion counts, several problems emerge:
- Chefs over-portion "for safety" - Costs you real money
- Cost calculations fall apart - You budget for 25 portions but only get 20
- Shift inconsistency - Monday portions differ from Friday's
- New staff guess wildly - No standards to follow
⚠️ Watch out:
Just 5 missing portions per batch costs €780 yearly on one sauce (at 3 batches weekly).
How to determine exact portion numbers
Measure your batch using this three-step process:
- Total weight: Weigh the complete finished batch
- Individual portion weight: Weigh 5 typical servings, calculate average
- Portion count: Divide total by individual weight
💡 Example calculation:
Pesto batch weighing 1.2 kg:
- Average portion: 45 grams (from 5 measurements)
- Portion count: 1,200g ÷ 45g = 26.7 portions
- Round to: 26 portions per batch
Cost per portion: €15 ÷ 26 = €0.58
Recording in your system
Document these numbers and distribute them to your team:
- Recipe details: Precise ingredients and amounts
- Batch weight: Total finished product weight
- Serving size: Grams per plate
- Yield count: Plates per batch
- Unit cost: Price per portion for calculations
From analyzing actual purchasing data across different restaurant types, digital tools like KitchenNmbrs help standardize this information so every cook works with identical specs and cost calculations happen automatically.
💡 Real-world example:
Restaurant De Smaak tested their curry sauce:
- €18 batch, assumed 30 portions
- Actual measurement: only 24 portions
- Cost jumped from €0.60 to €0.75 per portion
- Menu price increased from €22 to €24
Annual margin improvement: €2,400
Impact on your food cost
Every "lost" portion increases your food cost percentage. Think you're getting 25 portions but actually getting 20? Your food cost just jumped 25%.
Formula: Real food cost = (Batch cost ÷ Actual portions) ÷ Selling price excl. VAT × 100
⚠️ Watch out:
Don't forget expensive side sauces and accompaniments. A costly truffle sauce can transform profitable mains into money-losers.
How do you calculate exact portion numbers? (step by step)
Measure your batch after making it
Weigh your complete batch of sauce after it's ready. Note this weight in grams. This is your starting point for all calculations.
Determine the weight per portion
Have your chef scoop 5 normal portions the way he always does. Weigh each portion separately and calculate the average. This is your standard portion weight.
Calculate number of portions and cost price
Divide the total batch weight by the weight per portion. Round down for safety. Now divide your batch costs by this number for the cost price per portion.
✨ Pro tip
Measure your truffle or specialty sauce portions within 48 hours - a €0.15 miscalculation on premium sauces costs more than €0.30 errors on basic mayo. High-end ingredients demand precision.
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
What if my chef gives different portions than I calculate?
Train your team on exact portion sizes using kitchen scales. Have them check regularly and maintain consistency. Your margin depends on standardized portions across all shifts.
Do I need to do this for all sauces?
Start with your 5 most-used sauces and sides since these impact total food cost most. Work through remaining items systematically afterward.
What if I make different batch sizes?
Calculate cost per 100 grams or per kilo of sauce. This lets you quickly determine portions and costs for any batch size you prepare.
📚 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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