What happens to your catering profits when ingredient costs jump 10% but your contract price stays frozen? Inflation eats away at your margin with every meal served. Here's how to calculate and justify necessary price adjustments.
Why inflation adjustment is crucial
Catering contracts for schools and care facilities typically run for a full year. But suppliers don't freeze their prices—they keep raising them. Without a correction mechanism, inflation devours your margin bite by bite.
⚠️ Note:
With 10% inflation and 30% food cost, you lose 3% of your total margin. On a €500,000 contract, that's €15,000 per year.
Calculate the impact on your cost price
Inflation doesn't hit all costs equally. Labor rises more gradually than ingredients. Energy costs can spike faster than food prices. You need to break down your costs:
- Food cost: 25-35% of contract value
- Labor: 35-45% of contract value
- Other costs: 15-25% of contract value
- Margin: 5-15% of contract value
💡 Example: €100,000 contract
Cost breakdown before inflation:
- Food cost: €30,000 (30%)
- Labor: €40,000 (40%)
- Other: €20,000 (20%)
- Margin: €10,000 (10%)
Total: €100,000
Calculate the cost increase per category
Different cost categories rise at different rates. Make realistic estimates for each type:
- Food: 10-15% increase (tracks general inflation)
- Labor: 3-5% increase (collective bargaining agreements)
- Energy: 15-25% increase (often exceeds food inflation)
- Other costs: 5-8% increase
I've seen restaurants ignore this breakdown—a mistake that costs the average restaurant EUR 200-400 per month in lost margins. Each category needs separate calculation.
💡 Example: Impact of 10% food inflation
Cost increase on €100,000 contract:
- Food cost: €30,000 × 1.10 = €33,000 (+€3,000)
- Labor: €40,000 × 1.04 = €41,600 (+€1,600)
- Other: €20,000 × 1.06 = €21,200 (+€1,200)
- Margin: €10,000 - €5,800 = €4,200 (-€5,800)
New total costs: €95,800 (margin drops from 10% to 4.2%)
Formula for contract adjustment
Use this formula to calculate your new contract price:
New contract price = Old price × (1 + weighted inflation percentage)
Calculate the weighted inflation percentage:
Weighted inflation = (Food cost% × Food increase%) + (Labor% × Labor increase%) + (Other% × Other increase%)
💡 Example: Calculate weighted inflation
For a contract with 30% food, 40% labor, 30% other:
- Food: 30% × 10% = 3.0%
- Labor: 40% × 4% = 1.6%
- Other: 30% × 6% = 1.8%
Weighted inflation: 3.0% + 1.6% + 1.8% = 6.4%
New contract price: €100,000 × 1.064 = €106,400
Communication with the client
Explain transparently why adjustment is necessary. Show your calculations and compare them with official inflation figures. Most care organizations and schools understand this if you provide proper documentation.
- Reference CBS inflation figures
- Show supplier invoices as proof
- Offer to share costs (e.g., 50/50 split)
- Propose quarterly reviews
⚠️ Note:
Without adjustment, you risk falling below break-even. Then you'll have to terminate the contract early or absorb losses.
Prevention: Build inflation adjustment into your contract
For future contracts: build in automatic inflation adjustment. Consider these options:
- Annual adjustment based on CBS figures
- Quarterly review if inflation exceeds 5%
- Fuel surcharge for delivery
- Clause for extreme price increases (>15%)
How do you calculate cost price increases with inflation? (step by step)
Break down your costs into categories
Divide your total contract costs into food cost (25-35%), labor (35-45%), other costs (15-25%), and margin (5-15%). This gives you insight into where inflation hits hardest.
Determine inflation percentage per category
Food often rises 10-15%, labor 3-5% (collective bargaining), energy 15-25%, other costs 5-8%. Use realistic percentages based on your suppliers and CBS figures.
Calculate weighted inflation percentage
Multiply each cost percentage by its inflation and add them up. For example: (30% × 10%) + (40% × 4%) + (30% × 6%) = 6.4% total cost increase.
Calculate new contract price
Multiply your current contract price by (1 + weighted inflation). With €100,000 and 6.4% inflation, this becomes €100,000 × 1.064 = €106,400.
Support your request
Show CBS figures, supplier invoices, and your calculation. Propose sharing the increase or building in quarterly reviews for transparency.
✨ Pro tip
Review your contract adjustments every 6 months, not annually. With volatile food costs, semi-annual reviews help you catch margin erosion before it reaches 3-4% of total contract value.
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 my client refuses to accept a price increase?
Show your cost increases transparently with invoices and CBS figures. If they still refuse, calculate whether the contract remains profitable. Operating at a loss isn't sustainable for any business.
What inflation percentage should I use for food costs?
Check CBS food inflation for the last 12 months, which typically ranges between 8-15%. But also use your actual supplier invoices for the most accurate picture of your specific cost increases.
Can I include automatic inflation adjustment in new contracts?
Absolutely—and you should. Build in a clause for annual adjustment based on CBS figures, or quarterly reviews if inflation exceeds 5%. This prevents difficult renegotiations later and protects your margins structurally.
📚 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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