Most chefs think doubling ingredients doubles portions perfectly - that's completely wrong. Your cost per portion shifts because spices, seasonings, and cooking losses don't scale linearly. Here's how to scale properly without destroying your margins.
Why scaling affects food cost
Not all ingredients follow the same multiplication rules. Main ingredients scale directly, but seasonings don't.
? Example:
Scaling pasta carbonara from 10 to 50 portions:
- Pasta: 1 kg → 5 kg (direct scaling)
- Bacon: 500g → 2.5 kg (direct scaling)
- Salt: 10g → 25g (NOT 50g!)
- Pepper: 5g → 15g (NOT 25g!)
Cost per portion drops due to these adjustments.
Three ingredient categories for scaling
Every ingredient fits one pattern:
- Direct (1:1): Proteins, pasta, vegetables, main components
- Reduced scaling (less than 1:1): Spices, seasonings, salt, acids, flavor enhancers
- Fixed amounts: Searing oil, pan greasing butter
⚠️ Heads up:
Scale everything directly and you'll create overseasoned disasters. Plus your food costs become meaningless - that's the kind of thing you only learn after closing your first month at a loss.
Calculate correction factors by ingredient type
Each ingredient gets its own multiplier based on function:
- Factor 1.0: Proteins, vegetables, starches, main ingredients
- Factor 0.7-0.8: Dried herbs, mild spices, vinegars
- Factor 0.5-0.6: Salt, sugar, potent seasonings
- Fixed amount: Cooking fats, greasing agents
? Example calculation:
Scaling 10 to 50 portions (5x multiplier):
- Chicken thigh: 2 kg × 5 = 10 kg
- Paprika: 20g × 5 × 0.7 = 70g
- Salt: 15g × 5 × 0.5 = 37.5g
- Cooking oil: remains 50ml (fixed)
Cost impact per portion
Correction factors typically reduce your per-portion cost during scaling. Expensive seasonings scale down while cheaper base ingredients scale directly.
? Cost comparison:
Recipe scaling: 10 vs 50 portions:
- 10 portions: €4.20 per portion
- 50 portions (direct scaling): €4.20 per portion
- 50 portions (corrected): €4.05 per portion
Savings: €0.15 per portion through proper scaling
Large batch cooking losses
Bigger quantities create additional waste from:
- Increased surface browning in larger pans
- Extended cooking times causing more evaporation
- Difficult stirring leading to uneven results
Add 5-10% extra cooking loss for batches over 25 portions.
⚠️ Heads up:
Always taste-test your first scaled batch. Adjust correction factors based on actual results.
Digital recipe tracking systems
Tools like KitchenNmbrs let you store multiple recipe versions (10, 25, 50 portions) with built-in correction factors. You avoid recalculating each time and eliminate scaling errors.
How do you calculate correction factors when scaling?
Determine the scaling factor
Divide the desired number of portions by the current number. From 10 to 50 portions = factor 5. From 8 to 30 portions = factor 3.75.
Classify each ingredient
Main ingredients get factor 1.0. Spices and seasonings get factor 0.7-0.8. Salt and strong flavor makers get factor 0.5-0.6. Cooking oil stays a fixed amount.
Calculate new quantities
Multiply each quantity by scaling factor × correction factor. Main ingredient: 500g × 5 × 1.0 = 2500g. Paprika powder: 10g × 5 × 0.7 = 35g.
Recalculate the food cost
Add up all new ingredient costs and divide by the new number of portions. Compare with the original cost per portion to see the difference.
Test and adjust
Make the recipe and taste it. Adjust correction factors if the flavor isn't right. Document the final factors for future use.
✨ Pro tip
Test your correction factors on exactly 3 signature dishes over the next 2 weeks. Once you nail the ratios, you'll never oversalt a scaled batch again.
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 does my dish become too salty when scaling up?
How much do correction factors reduce my food cost?
Can I scale sauces and emulsions the same way?
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.
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