Higher occupancy with equal fixed costs creates pure profit per additional guest. Restaurant owners watch revenue climb but can't pinpoint exactly how much extra margin each new customer delivers. A straightforward calculation reveals precisely what every additional guest contributes to your bottom line.
What are fixed costs and why are they important?
Fixed costs are monthly expenses that don't change based on guest count. Rent, insurance, depreciation and core labor remain constant regardless of serving 50 or 150 guests daily.
- Rent of your premises
- Insurance and permits
- Core team (chef, permanent staff)
- Equipment depreciation
- Utilities (basic consumption)
💡 Example:
Restaurant with 60 seats:
- Rent: €4,500 per month
- Insurance: €400 per month
- Core team: €8,000 per month
- Other fixed costs: €1,100 per month
Total fixed costs: €14,000 per month
Calculate your fixed costs per guest
First, determine how much fixed costs each guest absorbs. Divide total monthly fixed costs by your guest count to find this figure.
Formula: Fixed costs per guest = Total fixed costs per month / Number of guests per month
💡 Example calculation:
At 70% occupancy (26 days open, 42 guests/day average):
- Number of guests per month: 26 × 42 = 1,092 guests
- Fixed costs per guest: €14,000 / 1,092 = €12.82
Each guest contributes €12.82 toward your fixed expenses.
Calculate the extra margin with higher occupancy
As occupancy rises, fixed costs stay identical but spread across more customers. That difference becomes additional profit. This represents one of the most common blind spots in kitchen management - owners see revenue increase but don't quantify the margin boost from fixed cost dilution.
Formula: Extra margin = (Fixed costs per guest at low occupancy - Fixed costs per guest at high occupancy) × Number of extra guests
💡 Example scenario:
Occupancy jumps from 70% to 85%:
- At 85%: 26 × 51 guests/day = 1,326 guests/month
- New fixed costs per guest: €14,000 / 1,326 = €10.56
- Difference per guest: €12.82 - €10.56 = €2.26
- Extra guests: 1,326 - 1,092 = 234 guests
Extra margin: €2.26 × 1,326 = €2,997 per month
⚠️ Note:
This assumes variable costs (food cost, extra staff) stay consistent per guest. Much higher occupancy might require additional staff.
What does this mean for your profitability?
Higher occupancy offers one of the quickest paths to increased profit. Your fixed expenses are already covered, so every additional guest flows directly to your margin.
- No additional investments needed
- Spread fixed costs across more guests
- More revenue without proportional cost increase
- Better cash flow and profitability
💡 Practical example:
Restaurant with average check of €35:
- Food cost: 30% = €10.50
- Fixed costs per guest at 70%: €12.82
- Other variable costs: €8.00
- Profit per guest at 70%: €35 - €10.50 - €12.82 - €8.00 = €3.68
At 85% occupancy fixed costs drop to €10.56 per guest. New profit: €35 - €10.50 - €10.56 - €8.00 = €5.94 per guest. That's €2.26 more profit per guest!
Tools to monitor your occupancy and margin
Making these calculations regularly requires tracking costs and visitor numbers. Most restaurant management systems can record fixed costs and automatically calculate margin per guest at different occupancy levels.
How do you calculate the extra margin? (step by step)
Gather your fixed costs per month
Add up all costs you have regardless of your occupancy: rent, insurance, core team, depreciation. These are your total fixed costs per month.
Calculate fixed costs per guest at current occupancy
Divide your total fixed costs by your current number of guests per month. This gives you the fixed costs per guest at your current occupancy level.
Calculate fixed costs per guest at higher occupancy
Use the same amount of fixed costs but divide by the higher number of guests. The difference between both amounts is your extra margin per guest.
✨ Pro tip
Track your slowest Tuesday versus your busiest Saturday night profit margins over the past 12 weeks. That €4-6 difference per guest demonstrates exactly how fixed cost dilution impacts your bottom line.
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
Do fixed costs still apply if I need to hire more staff?
No, extra staff during busy periods are variable costs. Calculate these separately as additional costs per guest. Only expenses that truly remain constant qualify as fixed costs.
What if my energy costs increase with higher occupancy?
Energy costs split between fixed (basic consumption) and variable (more cooking, dishwashing). Separate these components and only include the fixed portion in this calculation.
What is a realistic occupancy increase?
Most restaurants can move from 70% to 80-85% without major adjustments. Above 90% you'll often need extra staff or expansion, which changes the calculation entirely.
📚 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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