Think of your recipe like a finely tuned engine - replace one part with something different, and the whole performance changes. The new ingredient often costs more or less, which shifts your food cost percentage. Here's how to calculate your new margin and adjust accordingly.
Why replacing an ingredient affects your margin
Your supplier stops carrying a product, so you need an alternative fast. But that new ingredient usually has a different price. Sometimes cheaper, but more often expensive. Don't adjust your menu price? Your margin shifts without you realizing it.
⚠️ Watch out:
Many owners grab the first alternative without recalculating cost price. That's a mistake that costs the average restaurant EUR 200-400 per month.
Calculate the difference in cost price
Start by calculating the new cost price per portion. Add up all ingredients of your dish, including the replacement. Then compare this with your old cost price.
💡 Example pasta carbonara:
Your supplier stops carrying pancetta (€24/kg). The alternative guanciale costs €32/kg.
- Old cost price per portion: €5.20
- Pancetta 80g: €1.92
- Guanciale 80g: €2.56
- Difference: +€0.64 per portion
New cost price: €5.84 per portion
Calculate the new food cost percentage
With the new ingredient costs, calculate your updated food cost percentage. Use this formula: Food cost % = (Ingredient costs / Selling price excl. VAT) × 100
💡 Example calculation:
Menu price pasta: €18.50 incl. 9% VAT
- Selling price excl. VAT: €18.50 / 1.09 = €16.97
- Old food cost: (€5.20 / €16.97) × 100 = 30.6%
- New food cost: (€5.84 / €16.97) × 100 = 34.4%
Difference: +3.8 percentage points
Determine your options
Now you know the difference. You've got three choices:
- Raise the price: Adjust your menu price to maintain the same margin
- Accept the lower margin: Keep the same price but earn less per dish
- Find another alternative: Search for a cheaper replacement ingredient
💡 Impact on annual basis:
At 50 portions of pasta per week:
- Extra costs: €0.64 × 50 × 52 = €1,664 per year
- At 100 portions: €3,328 per year
That often justifies a small price increase.
Calculate the new minimum selling price
Want to maintain the same margin? Calculate the new minimum selling price. Use: Minimum price excl. VAT = Ingredient costs / (Desired food cost % / 100)
💡 New price calculation:
For 30.6% food cost with new ingredients:
- Minimum price excl. VAT: €5.84 / 0.306 = €19.08
- Minimum price incl. VAT: €19.08 × 1.09 = €20.80
- Old price: €18.50
Price increase needed: €2.30 (+12.4%)
Communicate the change
A 12% price increase sounds steep, but it's often justified by rising purchasing prices. Most guests understand this, especially if you maintain or improve quality.
⚠️ Watch out:
Test the new dish thoroughly first. A more expensive ingredient that tastes worse costs you more than money - it costs you guests.
How do you calculate the margin when replacing an ingredient?
Calculate the new cost price per portion
Add up all ingredients including the replacement ingredient. Compare with your old cost price to see the difference per portion.
Calculate the new food cost percentage
Divide the new ingredient costs by your current selling price (excl. VAT) and multiply by 100. This gives you your new food cost percentage.
Determine your new selling price
Divide your new ingredient costs by your desired food cost percentage (as a decimal). Multiply by 1.09 for the price including VAT.
Calculate the impact on annual basis
Multiply the cost difference per portion by your estimated number of portions per year. This shows whether a price adjustment is needed.
✨ Pro tip
Calculate your new margin within 48 hours of switching ingredients, then test the dish with at least 3 staff members before serving it to guests. Speed matters, but quality can't suffer.
Calculate this yourself?
In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.
Was this article helpful?
Frequently asked questions
Do I always have to raise my price if an ingredient gets more expensive?
Not necessarily. If the difference is small (under €0.20 per portion) and your margin stays above 65%, you can often absorb it. For larger differences, a price adjustment makes sense.
How do I find the optimal alternative ingredient?
Look for ingredients with similar taste and texture profiles. Test different suppliers and negotiate volume discounts. Sometimes a slightly different ingredient is cheaper but equally delicious.
Can I adjust the portion size instead of raising the price?
Yes, but be cautious. Smaller portions get noticed by guests quickly. A modest price increase is often more honest than secretly reducing portions.
What if multiple suppliers stop carrying products simultaneously?
Create a priority list starting with your best-selling dishes. Calculate the impact per dish and address the biggest cost increases first. Sometimes you can implement multiple changes together.
📚 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.
Optimize your purchasing with data
Know exactly which supplier is most cost-effective and how price changes affect your margins. KitchenNmbrs links purchasing directly to recipe costs. Try it free for 14 days.
Start free trial →