Your margins determine whether your business survives. Many restaurant owners only look at food cost, but forget that you also need to pay rent and staff. Calculate your total margins and link them to all your fixed costs.
It's Tuesday afternoon and you're staring at your bank account, wondering where all the money went. Your food cost looks decent at 30%, but somehow there's barely enough left to cover next month's rent. The problem? You're only tracking ingredient costs while ignoring the €14,000 in fixed expenses that hit your account every month regardless of how many covers you serve.
Why food cost isn't enough
You have a food cost of 30%. Looks solid, right? But then at the end of the month there's nothing left. How's that possible?
Because food cost only covers your ingredient expenses. You've also got:
- Rent (or mortgage)
- Labor costs
- Energy, water, gas
- Insurance
- Depreciation
- Marketing
Every single dish needs to contribute toward covering these expenses. That's why you need a total margin calculation, not just food cost tracking.
The total margin formula
Your total margin must cover every expense and still generate profit. Here's how:
💡 Formula:
Total margin % = (All costs + Desired profit) / Revenue × 100
Or flipped around: Minimum revenue = (All costs + Desired profit) / Margin %
Step 1: Calculate your fixed costs per month
Add up every expense you pay monthly, regardless of how many customers walk through your door:
💡 Example bistro:
- Rent: €3,500
- Staff (fixed): €8,000
- Energy: €800
- Insurance: €400
- Depreciation: €600
- Other: €700
Total fixed costs: €14,000/month
Step 2: Calculate your variable costs percentage
These expenses scale directly with your revenue:
- Food cost: 28-35% of revenue
- Extra staff: 5-10% of revenue (during busy periods)
- Payment fees: 1-2% of revenue
- Variable energy: 2-3% of revenue
💡 Example variable costs:
- Food cost: 32%
- Extra staff: 8%
- Payment fees: 1.5%
- Variable energy: 2.5%
Total variable costs: 44% of revenue
Step 3: Calculate your break-even revenue
Break-even is where all expenses are covered, but you're not earning any profit yet.
💡 Break-even calculation:
Break-even revenue = Fixed costs / (100% - Variable costs %)
Using our example:
€14,000 / (100% - 44%) = €14,000 / 0.56 = €25,000/month
You need minimum €25,000 revenue to break even
⚠️ Note:
Break-even means zero profit. You're just covering expenses. For actual profit, you need higher revenue.
Step 4: Add desired profit
How much profit do you want? A realistic profit margin in hospitality runs between 5-15% of revenue.
💡 Example with 10% profit:
Total margin needed: 44% (variable) + 10% (profit) = 54%
Required revenue: €14,000 / (100% - 54%) = €30,435/month
For €1,400 profit/month you need €30,435 revenue
Step 5: Translate to number of covers
How many guests must you serve to hit this revenue target?
💡 Example:
Required revenue: €30,435/month
Average check: €35 per person
Open 26 days per month
€30,435 / €35 / 26 days = 33 guests per day
You need minimum 33 covers daily
What if you don't reach these numbers?
If you're serving fewer than 33 guests daily, you can:
- Raise prices: Higher average check
- Lower fixed costs: Cheaper location, fewer staff
- Lower variable costs: Better food cost, more efficient operations
- Attract more guests: Marketing, improved experience
Based on real restaurant P&L data I've analyzed, most failing restaurants focus obsessively on food cost while their rent eats up 18-25% of revenue. The math simply doesn't work.
⚠️ Note:
Many entrepreneurs think controlling food cost is enough. But if your fixed costs are too high, even a perfect 28% food cost won't save you.
How do you calculate your total margin? (step by step)
Add up all your fixed costs
Make a list of all costs you pay every month: rent, fixed staff, insurance, energy, depreciation. Add these up for your total fixed costs per month.
Calculate your variable costs percentage
Add food cost, extra staff, payment fees, and variable energy. This gives you the percentage of your revenue that goes to variable costs.
Calculate your break-even revenue
Divide your fixed costs by (100% minus your variable costs percentage). This is the minimum revenue to break even without profit.
Add desired profit
Determine how much profit you want (5-15% of revenue). Add this to your variable costs and recalculate your required revenue for profit.
Translate to number of guests
Divide your required revenue by your average check and number of working days. This tells you how many covers you need per day.
✨ Pro tip
Track your rent-to-revenue ratio weekly - it should never exceed 12% of your gross sales. If it creeps above 15%, you're in trouble regardless of how well you control food costs.
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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 include VAT in my margin calculation?
No, always calculate excluding VAT. Your revenue excluding VAT must cover your costs. VAT is a pass-through to the tax authority.
What if my fixed costs are higher than my revenue?
Then you're losing money every month. You must either lower your fixed costs (cheaper location, fewer staff) or increase your revenue by attracting more guests or raising prices.
What if I have seasonal fluctuations?
Calculate per season. In busy months you need to earn enough to compensate for slow periods. Spread your annual costs over your actual revenue months.
📚 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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