Menu changes gone wrong cost the average restaurant €4,000-6,000 annually in lost profits. You might create a better dish, but if it sells less than your current bestseller, your bottom line suffers. Here's how to calculate the exact financial impact before you make the switch.
Why this calculation is crucial
Your replacement might taste incredible, but if it generates less profit per portion and sells less frequently, you'll watch money disappear. Most restaurant owners only realize this at month-end - a mistake that costs the average restaurant EUR 200-400 per month.
- Your bestseller currently generates X euros in profit monthly
- The new dish has different ingredient costs
- Guests might order the new dish less frequently
- Your selling price might be different
Gather the numbers from your current bestseller
Start with your current situation. You need this data from the dish you're replacing:
💡 Example current bestseller:
Pasta carbonara - sold 120x per month
- Selling price: €18.50 incl. VAT (€16.97 excl. VAT)
- Ingredient costs: €5.10 per portion
- Food cost: 30.1%
- Margin per portion: €11.87
Total monthly profit: €1,424
Pull these numbers from your POS system or manually count portions sold last month.
Calculate the costs of your new dish
Now calculate what the new dish will cost. Add up all ingredients, including garnish, sauces, and oil.
💡 Example new dish:
Mushroom risotto - planned price €21.00 incl. VAT
- Selling price: €21.00 incl. VAT (€19.27 excl. VAT)
- Ingredient costs: €6.80 per portion
- Food cost: 35.3%
- Margin per portion: €12.47
⚠️ Watch out:
Don't forget the 'hidden' ingredients: olive oil, butter, salt, spices, garnish. Those costs add up quickly.
Estimate the sales numbers
This part's tricky. New dishes often sell less than you expect, especially during the first few months.
- Conservative scenario: 60-70% of your old bestseller
- Realistic scenario: 80-90% of your old bestseller
- Optimistic scenario: 100-110% of your old bestseller
In our example: carbonara sold 120x monthly. For the risotto, we're calculating with 85 portions per month (70% of 120).
Calculate the difference in monthly profit
Now you can calculate the impact:
💡 Impact calculation:
Old situation vs. new situation
- Carbonara: 120x × €11.87 = €1,424/month
- Risotto: 85x × €12.47 = €1,060/month
- Difference: -€364 per month
Annually: €364 × 12 = €4,368 less profit
Despite the higher margin per portion (€12.47 vs €11.87), you lose money due to lower sales volume.
Create scenarios for different sales figures
Calculate multiple scenarios to find your break-even point:
- Break-even point: €1,424 ÷ €12.47 = 114 portions per month
- Sell fewer than 114 portions? You lose money
- Sell more than 114 portions? You earn more
⚠️ Watch out:
This calculation assumes guests order the new dish instead of the old one. If they choose something else entirely, the impact grows.
Create a decision matrix
Make an overview of all factors:
- Financial impact: How much do you win or lose monthly?
- Risk: How certain are you about the sales numbers?
- Strategic value: Does the new dish fit better with your concept?
- Operational impact: Is the new dish easier or harder to prepare?
A food cost calculator like KitchenNmbrs can automatically perform these calculations and run different scenarios, so you quickly see the impact of menu changes.
How do you calculate the financial impact? (step by step)
Analyze your current bestseller
Gather the selling price, ingredient costs, and sales numbers of the dish you want to replace. Count how many portions you sold last month and calculate the margin per portion.
Calculate the costs of the new dish
Add up all ingredient costs of the new dish, including garnish and sauces. Determine your selling price and calculate the food cost and margin per portion.
Estimate sales numbers in three scenarios
Calculate conservatively (60-70%), realistically (80-90%), and optimistically (100-110%) how many portions you expect to sell. New dishes usually sell less than expected.
Calculate the difference in monthly profit
Multiply the margin per portion by the expected sales numbers for both dishes. The difference shows your financial impact per month.
Determine your break-even point
Divide the current monthly profit by the margin of the new dish. This gives you the minimum number of portions you need to sell to earn the same amount.
✨ Pro tip
Run your new dish as a special for exactly 14 days while keeping the bestseller available. Track daily sales of both dishes to get realistic data before making the permanent switch.
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
Should I calculate with or without VAT?
Always calculate without VAT for your food cost calculations. The price on your menu includes 9% VAT, so divide by 1.09 to get the price excluding VAT.
How do I know how much the new dish will sell?
That's difficult to estimate accurately. Start conservatively with 60-70% of your current bestseller's volume. New dishes need time to become popular with guests.
What if my new dish is more expensive than the old one?
A higher price can compensate for lower sales numbers, but only if the margin per portion increases enough. Always calculate the total monthly result, not just the margin per portion.
Should I also account for kitchen labor costs?
For this comparison, focus on ingredient costs. Labor time usually doesn't differ much between dishes, unless the new dish requires significantly more prep work or cooking time.
When is it smart to switch despite losing money?
If the new dish fits better with your concept, is easier to prepare, or if you expect it to sell more long-term. Sometimes a temporary loss is strategically smart for brand positioning.
How long does it take for a new dish to reach its potential?
Usually 2-3 months before guests discover and regularly order the new dish. Calculate with lower sales numbers initially and monitor weekly performance.
Can I test the financial impact without permanently removing my bestseller?
Yes, run the new dish as a weekly special first or offer both dishes temporarily. This gives you real sales data before making the permanent switch.
📚 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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