Most brunch owners think daily sales numbers tell the whole story - they don't. Seasonal swings and weekday slumps can hide profit leaks that only show up over 90 days. Your quarterly margin reveals if you're actually making money or just staying busy.
Gather all revenue and cost data from 3 months
You'll need complete financial records for an accurate quarterly picture. Pull together your POS data, supplier invoices, and payroll records.
- Monthly revenue totals (excluding VAT)
- Every food and beverage purchase invoice
- Staff costs (wages plus employer contributions)
- Fixed expenses (rent, utilities, insurance)
💡 Example quarter Q1:
Brunch café with 60 seats, open Thu-Sun:
- January revenue: €28,500 excl. VAT
- February revenue: €31,200 excl. VAT
- March revenue: €35,800 excl. VAT
Total quarterly revenue: €95,500
Calculate your total food cost over the quarter
Sum up every food and beverage invoice from the three months. But most owners mess up here - you can't just add invoices and call it done.
⚠️ Attention:
If your ending inventory is higher than your starting inventory, subtract that difference from total purchases. Otherwise you're inflating your food costs.
Formula:
Actual food cost = Total purchases - (Ending inventory - Starting inventory)
💡 Example calculation:
- Total purchases Q1: €32,400
- Inventory January 1: €3,200
- Inventory March 31: €3,800
Actual food cost: €32,400 - (€3,800 - €3,200) = €31,800
Food cost %: (€31,800 / €95,500) × 100 = 33.3%
Not tracking inventory changes properly is a mistake that costs the average restaurant EUR 200-400 per month in skewed food cost calculations.
Calculate personnel costs and fixed costs
Staff expenses typically eat up your second-largest chunk of revenue. Don't forget the hidden costs beyond base wages.
- Gross wages for all team members
- Employer contributions (roughly 25% of gross wages)
- Agency staff or temporary workers
- Owner's salary if you pay yourself
Fixed costs hit you regardless of how busy you get:
- Rent and building charges
- Utilities (gas, water, electricity)
- Insurance premiums
- Communications, internet, software subscriptions
- Equipment depreciation
💡 Example cost breakdown:
- Personnel costs Q1: €38,200
- Rent Q1: €15,000
- Energy Q1: €4,200
- Other fixed costs: €3,600
Total costs excl. food cost: €61,000
Calculate your net quarterly margin
This is where you find out if you're actually profitable. Add everything up and see what's left.
Formula for total margin:
Net margin = Revenue - Food cost - Personnel costs - Fixed costs
💡 Complete calculation:
- Revenue Q1: €95,500
- Food cost: €31,800 (33.3%)
- Personnel costs: €38,200 (40.0%)
- Fixed costs: €22,800 (23.9%)
Net margin: €95,500 - €92,800 = €2,700 (2.8%)
Margin percentage: (Net margin ÷ Revenue) × 100
Healthy brunch margins run 8-15%. If you're under 5%, you need immediate changes.
Analyze seasonal patterns and trends
Brunch spots face wild seasonal swings. Break down your numbers by month to spot the patterns.
- Which month delivered peak revenue?
- Did costs stay proportional to sales?
- How did customer counts trend?
- Which menu items drove the most sales?
⚠️ Attention:
One quarter can mislead you due to seasonal factors. Always compare against the same quarter from the previous year for meaningful insights.
How do you calculate quarterly margin? (step by step)
Gather all financial data from 3 months
Get cash register reports, purchase invoices and payroll administration. Make sure you have complete monthly figures without gaps.
Calculate actual food cost with inventory adjustment
Add up all purchases and adjust for inventory difference. Formula: Purchases - (Ending inventory - Beginning inventory).
Sum all personnel and fixed costs
Calculate wages, social contributions, rent, energy and other fixed costs together for the entire quarter.
Subtract all costs from revenue for net margin
Formula: Revenue - Food cost - Personnel costs - Fixed costs = Net margin. Calculate percentage for comparison.
✨ Pro tip
Calculate your margin per seat over the entire 90-day period - divide quarterly net margin by total seats available across all operating days. This reveals your true profit efficiency better than monthly averages.
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's a realistic quarterly margin for brunch concepts?
Aim for 8-15% net margin on revenue. Anything below 5% signals serious problems with pricing or cost control that need immediate attention.
How do I handle inventory that spoils during the quarter?
Track spoilage separately and add it to your food costs. Most successful brunch spots see 2-4% spoilage rates. Higher than that means you're over-ordering or have storage issues.
Should I calculate margins differently for weekend vs weekday service?
Yes, analyze them separately since weekend brunch typically has higher margins due to premium pricing and better table turns. Weekday performance often drags down overall quarterly numbers.
📚 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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