Restaurant margins drop 16% on average during expensive ingredient seasons. Ingredient prices shift dramatically throughout the year, yet platform costs remain fixed. Maintaining profitability means recalculating your margins each time you adjust seasonal offerings.
Why seasonal adjustments affect your margin
Delivery operations face three distinct cost categories that respond differently to seasonal shifts:
- Ingredient costs: Swing wildly (tomatoes €2/kg in summer, €6/kg in winter)
- Platform costs: Remain constant (15-30% of order value)
- Packaging costs: Stay fixed (€0.50-€1.50 per order)
The trap: you modify ingredients but forget to recalibrate your selling price.
⚠️ Heads up:
Platform fees calculate based on your selling price. Drop your price for seasonal ingredients, and you'll pay less in platform fees but also pocket less profit.
The adjusted food cost formula for delivery
Delivery requires a modified formula because of additional expenses:
Total product costs = Ingredients + Packaging + (Selling price × Platform %)
Net margin % = ((Selling price - Total product costs) / Selling price) × 100
💡 Example summer vs winter:
Summer pasta (seasonal tomatoes):
- Ingredients: €4.50
- Packaging: €0.80
- Selling price: €16.50
- Platform fee (20%): €3.30
Total costs: €8.60 → Margin: 47.9%
Winter pasta (greenhouse tomatoes):
- Ingredients: €7.20
- Packaging: €0.80
- Selling price: €16.50 (unchanged)
- Platform fee (20%): €3.30
Total costs: €11.30 → Margin: 31.5%
Three strategies for seasonal adjustments
Strategy 1: Let price move with costs
Modify your selling price according to ingredient expenses. Preserve the same margin by increasing price during costly seasons.
- Advantage: Consistent margin
- Disadvantage: Customers notice price variations
- Suitable for: Premium dishes, devoted customer base
Strategy 2: Swap the menu
Substitute expensive seasonal ingredients with affordable alternatives. Maintain selling price unchanged.
- Advantage: Consistent prices for customers
- Disadvantage: Additional menu development effort
- Suitable for: Casual dining, high volumes
Strategy 3: Hybrid approach
Blend both methods: substitute affordable ingredients, modify price moderately for costly ingredients. Most kitchen managers discover too late that this balanced approach prevents both customer shock and margin erosion.
💡 Example hybrid approach:
Winter: substitute fresh tomatoes (€6/kg) with dried tomatoes (€2.50/kg) and increase price by €1.50.
- Ingredient savings: €1.20 per portion
- Price increase: €1.50 per portion
- Extra margin: €0.30 per portion
Customer pays slightly more, but still receives quality.
When to adjust and when not to
Not every seasonal variation warrants an adjustment. Apply these guidelines:
- Adjust for >€1.50 difference per portion in ingredient costs
- Skip adjustments for <€0.75 difference - administrative overhead costs more
- Always adjust for >15% increase of main ingredient
⚠️ Heads up:
Delivery customers show more price sensitivity than restaurant diners. Test modest adjustments (€0.50-€1.00) before implementing large increases.
Tools for seasonal monitoring
Track these elements to respond promptly:
- Weekly purchase prices of your top 10 ingredients
- Monthly margin check of your 5 bestselling dishes
- Competitor prices - how do others handle seasonal changes?
A system like KitchenNmbrs helps you monitor ingredient prices and automatically calculate your new food cost after supplier adjustments.
How do you calculate seasonal margins? (step by step)
Calculate your current total costs
Add ingredient costs + packaging costs + (selling price × platform percentage). These are your actual costs per dish with delivery.
Check seasonal price of main ingredients
Ask your supplier for prices of your key ingredients for the next 3 months. Calculate the difference per portion compared to now.
Calculate new margin with adjusted costs
Use the new ingredient prices in your cost calculation. Keep selling price the same and check if your margin is still acceptable (minimum 35-40% for delivery).
Determine your adjustment strategy
When >€1.50 difference per portion: adjust price or swap ingredient. When <€0.75 difference: leave as is. Test small adjustments first.
Implement and monitor weekly
Roll out changes to your delivery platforms. Monitor your sales figures and margins weekly to see if customers accept the adjustment.
✨ Pro tip
Set up quarterly cost reviews 2 weeks before each season change to recalculate margins on your top 8 delivery items. This gives you time to adjust prices before ingredient costs spike.
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 I need to adjust my delivery prices every month for the season?
No, only for significant differences (>€1.50 per portion). Too many price changes confuse customers and create administrative burden. Monitor monthly, adjust quarterly.
How do I communicate seasonal prices to customers?
Be transparent: "Winter menu with seasonal ingredients" or "Summer special with fresh tomatoes". Customers understand seasonal differences if you explain them clearly.
What if my competitor doesn't adjust their prices?
Check if they use different ingredients or accept lower margins. Don't copy blindly - focus on your own profitability and quality standards.
Can I have different prices on different delivery platforms?
Technically yes, but confusing for customers who see you on multiple platforms. Keep prices consistent and compensate for higher platform costs in your overall pricing strategy.
How often should I update my ingredient prices?
At least monthly for seasonal products, weekly during transition periods (March-April, September-October). Suppliers usually provide 1-2 weeks advance notice.
Should I calculate margins differently for limited-time seasonal specials?
Yes, accept lower margins on short-term seasonal items since they drive traffic and create urgency. Focus on maintaining margins for your core menu items instead.
📚 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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