A new dish can make or break your total profit. Most entrepreneurs only look at food cost, but forget the contribution to your total contribution margin. Learn step-by-step how to calculate how much a new dish really contributes to your profit.
What is contribution margin?
Contribution margin is what's left from your selling price after you've deducted variable costs (ingredients). This money helps cover your fixed costs and profit.
💡 Example:
Pasta carbonara on your menu:
- Selling price: €18.50 incl. VAT = €16.97 excl. VAT
- Ingredient costs: €5.10
- Contribution margin: €16.97 - €5.10 = €11.87 per plate
Calculate the contribution margin per dish
For each new dish you need three numbers:
- Selling price excl. VAT (menu price / 1.09)
- Total ingredient costs per portion
- Expected number of sales per week/month
The formula is straightforward:
Contribution margin per dish = Selling price excl. VAT - Ingredient costs
💡 Example new dish:
Grilled sea bream with vegetables:
- Menu price: €26.00 incl. VAT = €23.85 excl. VAT
- Ingredient costs: €7.80
- Contribution margin: €23.85 - €7.80 = €16.05 per plate
Calculate the total contribution per period
Multiply the contribution margin per dish by the expected number of sales:
Total contribution = Contribution margin per dish × Number of sales
💡 Example calculation:
Sea bream with €16.05 contribution margin:
- Expectation: 25 portions per week
- Contribution per week: €16.05 × 25 = €401.25
- Contribution per month: €401.25 × 4.3 = €1,725
Compare with existing dishes
Also calculate the contribution margin of your current dishes to compare:
- Which dishes generate the most per plate?
- Which dishes do you sell most often?
- What's the average contribution margin of your menu?
⚠️ Note:
A high contribution margin per dish means nothing if nobody orders it. Always look at total contribution (margin × volume).
Impact on your total menu
A new dish can affect your menu in three ways:
- Replacement: Guests order this instead of another dish
- Addition: Extra sales on top of existing revenue
- Cannibalization: It takes sales away from more profitable dishes
Estimate what percentage of sales is real addition versus replacement of existing dishes. After managing kitchen operations for nearly a decade, I've seen how new dishes often replace 60-70% of existing sales rather than creating entirely new revenue.
Account for extra costs
Some new dishes bring extra costs:
- New ingredients you need to source
- Extra inventory that can spoil
- Training your kitchen team
- Time for mise-en-place
💡 Real-world example:
Restaurant with 200 covers/week considering new dish:
- Expectation: 15% of guests order new dish = 30 portions/week
- Contribution margin: €14.50 per portion
- Total contribution: €14.50 × 30 = €435/week = €1,870/month
How do you calculate a new dish's contribution? (step by step)
Calculate the contribution margin per portion
Subtract the total ingredient costs from your selling price excl. VAT. Add up all ingredients: main product, garnish, sauces, oil, everything that goes on the plate.
Estimate the expected number of sales
Determine how many portions you expect to sell per week or month. Look at similar dishes on your current menu as a reference.
Calculate the total monthly contribution
Multiply contribution margin per portion by the number of sales. This gives you the total contribution to your fixed costs and profit.
Compare with existing dishes
Check if this new dish generates more than your current dishes. Look at both margin per portion and total contribution per month.
Account for replacement effect
Estimate how much of this dish's sales is real addition versus replacement of other dishes. Adjust your calculation accordingly.
✨ Pro tip
Test your new dish's actual performance against 3 similar-priced items for 30 days. If it doesn't achieve at least 80% of their average weekly sales volume, consider menu placement changes or removal.
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
What if I estimate the number of sales wrong?
Start conservatively with your estimate. After 4-6 weeks you'll see the actual sales figures and can adjust. It's better to be pleasantly surprised than disappointed.
Should I include staff and energy costs?
No, contribution margin only looks at variable costs (ingredients). Staff and energy costs are fixed costs you have anyway, regardless of this dish.
How do I know if a new contribution margin is good?
Compare it with your current dishes. If the new dish has a higher contribution margin than your average, that's a good sign. Also pay attention to total contribution, not just per portion.
What if the new dish takes sales away from profitable dishes?
Calculate the net effect: (new contribution) minus (loss of contribution from other dishes). If the net effect is positive, the dish adds value.
📚 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.
Develop recipes with instant cost calculation
Every new recipe has a cost price. KitchenNmbrs calculates it while you build the recipe — so you know if it's profitable before it hits the menu. Try it free.
Start free trial →