Are you throwing money away through oversized portions or poor purchasing decisions? Food waste drains 5-15% of most restaurant purchases, but the source varies wildly between operations. Here's how to calculate which approach will save you the most cash.
Why both forms of waste drain your profits
Food waste hits your bottom line through two controllable channels:
- Portion control: Oversized portions, inconsistent scooping, missing standardized tools
- Purchasing planning: Overbuying, poor timing, ignoring shelf life limits
Both drain cash, but the financial impact differs dramatically by operation. Calculate both to see where your biggest opportunity lies.
Calculate portion control savings potential
Portion control means serving exactly what you've budgeted in your food cost calculations.
💡 Portion control example:
You budget 200g steak per portion, but cooks average 230g:
- Excess per portion: 30g = €1.80 (at €60/kg)
- Weekly sales: 50 steaks
- Weekly waste: €90
- Annual cost: €4,680
Potential savings: €4,680 annually
Portion control savings formula:
Annual savings = (Actual portion - Planned portion) × Price per kg × Weekly portions × 52
Calculate purchasing planning savings potential
Smart purchasing means buying precisely what you need, exactly when you need it. This minimizes spoilage and waste.
💡 Purchasing planning example:
You discard €120 worth of ingredients weekly from poor planning:
- Expired vegetables: €40
- Overstocked fish: €50
- Spoiled herbs/sauces: €30
- Weekly total: €120
- Annual cost: €6,240
Potential savings: €6,240 annually
Purchasing planning savings formula:
Annual savings = Weekly waste × 52
⚠️ Note:
Document everything you throw away for seven consecutive days and identify the cause. Most operators severely underestimate this figure.
Compare both savings opportunities
Calculate the return per hour invested to determine your priority:
- Portion control: Demands staff training, new procedures, ongoing monitoring
- Purchasing planning: Requires planning systems, supplier changes, inventory management
💡 Impact comparison:
Restaurant A evaluates both approaches:
- Portion control: €4,680 savings, 20 hours setup = €234/hour
- Purchasing planning: €6,240 savings, 40 hours setup = €156/hour
Decision: Tackle portion control first (superior hourly return)
Calculate the combination effect
These strategies amplify each other. Consistent portion control makes purchasing planning more precise since you'll know exact usage patterns. After managing kitchen operations for nearly a decade, I've seen this compound effect create remarkable results.
Total savings potential = Portion control + Purchasing planning - Overlap
Factor in roughly 10-15% overlap since some waste stems from both issues simultaneously.
Put it into action
Start with whichever approach delivers the highest return per hour invested. That's usually portion control since it's less complex than overhauling your entire purchasing system.
Food cost management tools help with both strategies: establish standard portion sizes in recipes and monitor actual costs against your projections.
How do you calculate both savings? (step by step)
Track your actual waste for a week
Note what you throw away and why: oversized portions, past date, overstocked. Record the value per category. This gives you the foundation for both calculations.
Calculate the impact of portion control
Measure actual portion size versus your planned portion. Multiply the difference by your price per kilo and number of portions per year. This shows your potential savings from standardization.
Calculate the impact of better purchasing planning
Add up what you throw away weekly due to poor planning (not due to portion control). Multiply by 52 weeks. This shows your potential savings from smarter purchasing.
Compare impact per hour of investment
Divide both savings by the time implementation takes. Start with the approach that delivers the highest savings per hour. Often that's portion control.
✨ Pro tip
Focus on your top 3 protein dishes for the next 30 days. Mastering portion control and purchasing planning for these items alone typically addresses 70% of your waste costs.
Calculate this yourself?
In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.
Was this article helpful?
Frequently asked questions
Which approach usually delivers the biggest savings?
It varies by operation. Restaurants with inconsistent portions benefit more from portion control. Operations discarding lots of expired ingredients save more through improved purchasing planning.
How do I measure portion control without disrupting kitchen flow?
Weigh random plates for one week before they reach the dining room. Sample across different shifts and cooks. Generally, 20-30 measurements per dish provides reliable data.
Can I implement both strategies simultaneously?
Yes, but focus on one initially. Multiple simultaneous changes create team resistance. Complete the first implementation before launching the second.
Which products typically get wasted due to poor planning?
Fresh items with short shelf life create the most waste: fish, meat, vegetables, herbs. Seasonal products bought too early or in excessive quantities also contribute significantly. Track waste by category for seven days to identify patterns.
📚 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.
Make food waste measurable and manageable
Every kilo you throw away is lost margin. KitchenNmbrs connects your inventory to your recipes so you can see exactly where waste occurs — and how much it costs. Try it free.
Start free trial →