Rising ingredient costs squeeze your margins while you're stuck serving hundreds of portions daily at fixed contract prices. But there's a mathematical way out: efficiency gains through volume spread your fixed costs over more portions, dramatically lowering cost per portion. School canteens and care facilities can unlock substantial savings through smart volume increases.
What is efficiency gain through volume?
Efficiency gain happens because you divide fixed costs (staff, energy, depreciation) across more portions. Make more portions, and your fixed costs per portion drop automatically.
- Fixed costs stay the same (chef, energy, kitchen rent)
- Variable costs rise proportionally (ingredients)
- Total costs per portion decrease
Identifying fixed vs. variable costs
You need to distinguish between costs that increase with volume and costs that stay put. This separation determines your actual savings potential.
💡 Example fixed costs:
- Head chef salary: €4,000/month
- Base energy costs: €800/month
- Equipment depreciation: €600/month
- Kitchen space rent: €1,200/month
Total fixed costs: €6,600/month
💡 Example variable costs:
- Ingredients per portion: €2.80
- Packaging per portion: €0.15
- Extra energy per portion: €0.05
Variable costs per portion: €3.00
The efficiency gain formula
Use this formula to calculate how much you save per portion by increasing volume:
Cost per portion = (Fixed costs / Number of portions) + Variable costs per portion
Higher volume makes that first part shrink fast.
💡 Example calculation:
School canteen currently makes 1,000 portions/month, considering expansion to 2,000 portions/month.
Current situation (1,000 portions):
- Fixed costs per portion: €6,600 / 1,000 = €6.60
- Variable costs per portion: €3.00
- Total cost per portion: €6.60 + €3.00 = €9.60
After expansion (2,000 portions):
- Fixed costs per portion: €6,600 / 2,000 = €3.30
- Variable costs per portion: €3.00
- Total cost per portion: €3.30 + €3.00 = €6.30
Savings per portion: €9.60 - €6.30 = €3.30
Total monthly efficiency gain
Calculate total savings by multiplying the savings per portion by your new volume:
Total efficiency gain = Savings per portion × New number of portions
💡 Continuing the example:
Savings per portion: €3.30
New volume: 2,000 portions/month
Monthly efficiency gain:
€3.30 × 2,000 = €6,600/month
Annual efficiency gain: €6,600 × 12 = €79,200
Important considerations when increasing volume
Not all costs stay completely fixed as you scale up. From tracking this across dozens of restaurants, these factors consistently trip up volume calculations:
- Capacity limits: Too much volume means you'll need additional staff
- Energy costs: Rise partly with volume (cooling, heating)
- Quality: Make sure quality doesn't suffer under higher volumes
- Storage: More ingredients require more refrigeration space
⚠️ Watch out:
Assume that 70-80% of your costs are truly fixed. The remaining 20-30% rises partly with volume. Calculate conservatively to avoid disappointments.
Break-even point for new investments
If increasing volume requires investments (extra equipment, renovation), calculate the break-even point:
Payback period = Investment / Monthly efficiency gain
💡 Example investment:
Extra oven and cooling needed: €25,000
Monthly efficiency gain: €6,600
Payback period: €25,000 / €6,600 = 3.8 months
Practical tips for canteen kitchens
- Start with a 3-month pilot period to measure actual costs
- Monitor quality extra carefully during volume increase
- Schedule staff flexibly (call-in workers for peak days)
- Use cost tracking tools to monitor prices during the transition
How to calculate efficiency gains? (step by step)
Split fixed and variable costs
Make a list of all monthly costs. Mark which ones stay the same (staff, rent, depreciation) and which increase with volume (ingredients, packaging). This is the foundation for your calculation.
Calculate current cost per portion
Divide your fixed costs by the current number of portions per month. Add the variable costs per portion. This gives you the current cost per portion.
Calculate new cost per portion at higher volume
Divide the same fixed costs by the new (higher) number of portions. Variable costs per portion stay the same. The difference between old and new cost per portion is your efficiency gain per portion.
✨ Pro tip
Calculate your fixed costs per hour for the first 12 weeks after volume increase - this reveals capacity bottlenecks before they eat into your efficiency gains. Most canteens hit their first bottleneck around 80% capacity increase.
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 percentage of my costs are truly fixed?
In canteen kitchens on average 60-70% of costs are fixed (staff, rent, base energy). The remaining 30-40% increases with volume. Calculate conservatively with 60% to avoid disappointments.
From what volume does efficiency gain become interesting?
Efficiency gain is greatest at the first volume doubling. Going from 500 to 1,000 portions delivers more savings per portion than going from 2,000 to 2,500 portions. Start with at least 50% volume increase.
How do I prevent quality loss with more volume?
Plan phased scaling over 3-6 months. Monitor customer satisfaction weekly. Train staff on efficient work processes and ensure sufficient cooling capacity for ingredient storage.
📚 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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