The average restaurant wastes €4,560 annually through uncontrolled purchasing decisions. Your purchasing directly controls your biggest expense after labor costs. Most restaurant owners buy impulsively, bleeding money through poor timing, excessive quantities, and overpriced suppliers.
Why monthly purchasing analysis matters
Your purchasing decisions directly impact food costs and profit margins. Without regular analysis, you can't identify:
- If you're buying too much or too little
- Which suppliers cost you too much
- Where seasonal fluctuations hit you
- If your purchasing rhythm matches your sales
A 30-minute monthly review can save hundreds of euros each month.
💡 Example:
Restaurant with €25,000 monthly revenue discovers through analysis:
- Fish supplier 15% more expensive than competitor: €180/month
- Too many vegetables purchased: €120 waste
- Wrong timing for meat orders: €80 extra
Savings: €380/month = €4,560/year
The 5 critical points of your monthly analysis
1. Purchasing vs. sales ratio
Compare total purchasing against revenue. Healthy ratios look like this:
- Restaurant: 28-35% of revenue to purchasing
- Bistro: 25-32% of revenue to purchasing
- Fast casual: 25-30% of revenue to purchasing
Consistently exceeding these percentages means money's leaking out somewhere.
2. Supplier price analysis
Track your 5 largest suppliers for price movements. Build a simple comparison table:
💡 Example monthly table:
- Meat Jansen: €1,240 (previous month €1,180) → +5%
- Vegetables De Wit: €680 (previous month €720) → -6%
- Fish Verkerk: €890 (previous month €850) → +5%
Action: Call meat and fish suppliers to explain price increases
3. Waste analysis
Calculate what you've discarded and its value. Normal waste runs 5-8% of purchasing. Anything above 10% signals trouble.
⚠️ Note:
Calculate waste in purchasing value, not selling value. €50 of discarded meat costs you €50, not the €150 menu price.
4. Inventory rotation check
Identify products sitting in stock too long. Items remaining longer than a week drain your cash flow through:
- Capital tied up in inventory
- Risk of spoilage
- Storage space occupied
5. Seasonality and planning
Match your purchasing rhythm to seasons and events. A pattern we see repeatedly in restaurant financials shows operators paying premium prices for out-of-season ingredients. Asparagus costs triple in October compared to May pricing.
Practical execution: your monthly checklist
Schedule this for the 5th of every month. Gather last month's invoices and work through this checklist:
💡 Practical example checklist:
- Total purchasing: €8,750 at €28,000 revenue = 31% ✓
- Biggest increase: meat +8% → call supplier
- Waste: €380 = 4.3% of purchasing ✓
- Slow moving: veal (10 days inventory) → order less
- Next month: asparagus season → adjust menu
Digital support for your analysis
Excel works but eats up time. Systems automatically track:
- Purchasing per supplier per month
- Cost price development per dish
- Inventory rotation and shelf life
- Automatic food cost calculation
This cuts your monthly analysis from an hour down to 10 minutes.
Actions based on your analysis
Analysis without action wastes time. Typical responses include:
- Price increase >10%: Call supplier or find alternative
- Waste >8%: Order smaller quantities
- Inventory >1 week: Adjust menu or promote items
- Season change: Update menu and recipes
⚠️ Note:
Don't change everything at once. Tackle 1-2 points per month. Too many changes create kitchen chaos.
How do you set up a monthly purchasing analysis? (step by step)
Collect all purchasing invoices from the past month
Gather all supplier invoices together. Sort by supplier and add up the total amounts per supplier. Also note your total revenue for that month.
Calculate your purchasing-revenue ratio and compare with previous month
Divide your total purchasing by your revenue and multiply by 100. For example: €8,000 purchasing at €25,000 revenue = 32%. Compare this with previous month and your target percentage.
Analyze price changes per supplier
Compare each supplier with previous month. Increases above 5% deserve attention. Call suppliers for unexpected increases and ask for the reason.
Calculate your waste and slow-moving inventory
Estimate the value of discarded food and products that have been sitting longer than a week. Add this up and divide by your total purchasing. Above 8% requires action.
Create an action list for the coming month
Note 2-3 concrete actions: which supplier to call, which products to order less of, which menu items to adjust. Schedule these actions in your calendar.
✨ Pro tip
Block exactly 90 minutes on the 5th of each month for your purchasing review and treat it like your most important supplier meeting. This strict schedule helps restaurants achieve 12-15% better food cost control within 6 months.
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
How often should I do my purchasing analysis?
Monthly hits the sweet spot. Weekly analysis costs too much time for minimal benefit. Quarterly reviews let problems fester too long, costing you money.
What if my purchasing percentage is too high?
First verify your calculation uses revenue excluding VAT. Then examine waste levels, supplier pricing, and portion sizes. Usually one of these three drives the problem.
Do I need to compare all suppliers with competitors?
Focus on your 3-5 largest suppliers who represent 80% of your purchasing. Comparing small suppliers often costs more time than you'll save.
How do I prevent products from staying too long in inventory?
Order more frequently in smaller quantities. It's better to order twice weekly than once with excess. Also adjust your menu around existing inventory.
What if suppliers raise their prices?
Ask for detailed explanations first. For structural increases, you have three options: find alternative suppliers, adjust your menu, or raise selling prices. Usually a combination works most effectively.
Should I track purchasing costs by individual dish or just overall totals?
Track both, but start with overall totals if you're new to this. Individual dish costing provides deeper insights but requires more sophisticated systems and time investment.
How do I handle seasonal price swings in my analysis?
Create separate benchmarks for peak and off-season periods. Track year-over-year comparisons for the same month rather than month-to-month changes during volatile seasons.
📚 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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