Scaling recipes sounds straightforward until you taste the result and realize something's terribly wrong. Your seasonings are overpowering, your sauce is too thick, and you've just wasted ingredients worth hundreds of dollars. The math isn't as simple as multiplying by 10.
Why scaling often goes wrong
Most chefs assume: 200 grams of meat for 2 people equals 2 kilos for 20 people. That works for main ingredients, but fails miserably for everything else.
⚠️ Watch out:
Seasonings and spices do NOT scale linearly. 1 teaspoon of salt for 2 people doesn't become 10 teaspoons for 20 people. That becomes way too salty.
Thickening agents like flour, cornstarch and eggs behave unpredictably in large quantities. Your cooking time extends too, which bumps up labor costs - a pattern we see repeatedly in restaurant financials where scaled recipes destroy profit margins.
The scaling formula for ingredients
For most ingredients, you'll use this formula:
New amount = (Original amount ÷ Original servings) × New servings
💡 Example:
Recipe for 2 servings of pasta carbonara:
- Pasta: 200g → (200 ÷ 2) × 20 = 2000g = 2kg
- Bacon: 100g → (100 ÷ 2) × 20 = 1000g = 1kg
- Eggs: 2 pieces → (2 ÷ 2) × 20 = 20 pieces
But seasonings and flavor makers need different treatment:
- Salt and pepper: Scale with factor 6-8 (not 10)
- Fresh herbs: Scale with factor 7-9
- Dried herbs: Scale with factor 6-7
- Garlic and onion: Scale with factor 8-9
Calculate cost price for the new recipe
After scaling, you'll need to calculate the new cost price per serving. Add up all ingredient costs and divide by 20.
💡 Example cost price:
Ingredients for 20 servings of carbonara:
- 2kg pasta at €2.50/kg = €5.00
- 1kg bacon at €12.00/kg = €12.00
- 20 eggs at €0.25/piece = €5.00
- Cheese, seasonings, oil = €3.00
Total: €25.00 for 20 servings = €1.25 per serving
Compare this with your original cost price per serving. If the original recipe cost €2.60 for 2 servings (€1.30 per serving), you've achieved slight savings at €1.25 per serving through economies of scale.
Labor costs and cooking time
Larger quantities mean extended cooking times. Factor in:
- Prep work: 10x more ingredients = 8x more prep work (not linear)
- Cooking time: Often 20-30% longer due to larger pans
- Mise-en-place: More prep time needed
⚠️ Watch out:
If your cooking time goes from 30 minutes to 50 minutes, your labor costs increase by 67%. Factor this into your total cost price.
Practical tips for scaling
Make it easier with this approach:
- Start with smaller scaling (e.g. 2 to 8 servings)
- Document exactly what you've adjusted with seasonings
- Time the actual cooking process
- Taste continuously and adjust as needed
💡 Example test scaling:
From 2 to 8 servings (factor 4):
- Main ingredients: × 4
- Seasonings: × 3
- Cooking time: +30%
If this tastes good, you can safely scale to 20 servings.
How do you calculate the cost price of a scaled recipe?
Scale all ingredients correctly
Multiply main ingredients by the factor (10x in this case). Scale seasonings and spices with factor 6-8. Note all new amounts precisely.
Calculate the cost per ingredient
Multiply each new amount by the current purchase price. Add up all ingredient costs to get the total amount for 20 servings.
Divide by the number of servings
Divide the total ingredient costs by 20 to get the cost price per serving. Compare this with your original cost price per serving to see if scaling is beneficial.
✨ Pro tip
Test your scaling with a 4x batch first (2 to 8 servings) and time the entire process from prep to plating. Document every seasoning adjustment you make - this 15-minute investment saves you from ruining expensive ingredients later.
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
Why can't I just multiply everything by 10?
Seasonings, spices and thickening agents behave differently in large quantities. 10x salt becomes way too salty, and 10x flour makes your sauce too thick. Your taste buds detect flavor intensity logarithmically, not linearly.
Does my cost price per serving become cheaper after scaling?
Usually yes, due to bulk purchasing advantages. But your labor costs increase from longer cooking times. Always calculate both effects - the ingredient savings might get wiped out by the extra kitchen hours.
How much extra cooking time should I budget for scaled recipes?
Plan for 20-30% longer cooking times due to larger pan volumes and heat distribution. A 30-minute dish often becomes 40-45 minutes at 10x scale. This directly impacts your labor costs and kitchen scheduling.
📚 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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