Fixed price menus account for 34% of restaurant revenue, yet 68% of operators can't accurately calculate their true margins. The challenge isn't the single price—it's figuring out if you're actually making money while guests pick their own combinations. Here's how to calculate your real average cost per guest.
What is a fixed price menu?
With a fixed price menu, guests pay a set amount for multiple courses—say a 3-course dinner—choosing from different options per course. You control which dishes appear, but guests create their own combinations.
Here's the problem: each combination costs you differently. The guest ordering carpaccio, salmon, and tiramisu hits your margins harder than someone choosing soup, pasta, and ice cream. Most restaurants don't account for this variation—a mistake that costs the average restaurant EUR 200-400 per month in lost profits.
💡 Example:
3-course menu for €39.50 (incl. 9% VAT) = €36.24 excl. VAT
- Starter A (soup): €2.10 cost
- Starter B (carpaccio): €4.80 cost
- Main course A (pasta): €5.20 cost
- Main course B (salmon): €8.90 cost
- Dessert A (ice cream): €1.50 cost
- Dessert B (tiramisu): €3.20 cost
Cheapest combination: €8.80 (24% food cost)
Most expensive combination: €16.90 (47% food cost)
Calculate the average cost price
You need to know what the average guest actually costs. Do this by calculating all possible combinations and estimating how often guests choose each option.
Step 1: Count all possible combinations
- 2 starters × 2 main courses × 2 desserts = 8 total combinations
- Calculate each combination's cost
- Estimate the percentage choosing each option
💡 Realistic distribution:
- Soup chosen by 60% (cheaper option)
- Carpaccio by 40% (pricier but appealing)
- Pasta by 45% (vegetarian, widely liked)
- Salmon by 55% (meat-eaters prefer mains)
- Ice cream by 70% (lighter after dinner)
- Tiramisu by 30% (richer dessert)
Step 2: Calculate weighted average
Multiply each combination by its selection percentage, then add everything together.
💡 Calculation:
Soup + Pasta + Ice cream: €8.80 × (60% × 45% × 70%) = €1.66
Soup + Pasta + Tiramisu: €10.50 × (60% × 45% × 30%) = €0.85
Soup + Salmon + Ice cream: €12.50 × (60% × 55% × 70%) = €2.89
Continue for all 8 combinations...
Average cost price per guest: €11.20
Determine your margin
With your average cost price, you can now calculate margins:
- Food cost: (€11.20 / €36.24) × 100 = 30.9%
- Gross margin: €36.24 - €11.20 = €25.04 per guest
- Margin percentage: 69.1%
⚠️ Note:
Your calculation's only as accurate as your guest behavior estimates. Track which dishes get chosen and adjust calculations accordingly.
Optimize your menu composition
If margins are too thin, adjust the menu:
- Swap expensive options: Replace salmon with chicken, carpaccio with bruschetta
- Influence guest choices: Make cheaper options sound more appealing
- Increase pricing: €2 more = 5.5 percentage points lower food cost
- Reduce choices: Fewer options = better cost control
💡 Menu engineering tip:
Position your cheapest option first in each category. Many guests automatically pick the first thing they see.
Track your results
A fixed price menu isn't set-and-forget. Monitor weekly:
- Which combinations guests actually choose
- How reality compares to your estimates
- Any ingredient price changes
- Guest satisfaction with available choices
Tools like a food cost calculator can track individual dish costs and automatically calculate average cost prices based on real guest selections.
How do you calculate the margin on a fixed price menu?
Calculate the cost per dish
Make a list of all dishes on your menu and calculate exactly what each dish costs in ingredients. Include everything: main ingredients, garnish, sauces, oil, and everything that goes on the plate.
Estimate guest choice behavior
Determine what percentage of your guests choose each option. Start with a realistic estimate: cheaper dishes are chosen more often than expensive ones. Adjust this later with actual data.
Calculate the weighted average cost price
Multiply the cost of each possible combination by the percentage of guests that choose it. Add all results together to get your average cost price per guest.
Determine your food cost percentage
Divide your average cost price by your menu price (excl. VAT) and multiply by 100. A healthy food cost for a fixed price menu is between 28% and 35%.
Optimize where needed
If your food cost is too high, adjust your menu: replace expensive ingredients, raise the price, or guide choice behavior through better descriptions of cheaper options.
✨ Pro tip
Track actual guest combinations for the first 30 days—don't rely on guesswork. Most operators misjudge selection patterns by 15-20%, throwing off their entire margin calculation.
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
What if guests mainly choose the most expensive options?
Your estimates are off and food costs will exceed calculations. Adjust by replacing pricier options, increasing menu prices, or making cheaper dishes more appealing through better descriptions.
How often should I update my calculation?
Review monthly which combinations guests actually select and adjust percentages accordingly. Recalculate immediately whenever supplier prices change.
What's a healthy margin for a fixed price menu?
Target a food cost between 28-35%. This leaves adequate room for labor, overhead, and profit. At 30% food cost, you retain 70% for other business operations.
📚 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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