Setting up your first purchasing budget can make or break your restaurant's opening month. Too many new owners underestimate ingredient costs and find themselves scrambling for cash. Here's how to calculate exactly what you'll need.
Why a purchasing budget is crucial
Opening a restaurant means thinking about furniture, staff, and marketing. But here's what catches most people off guard: you're buying ingredients from day one. Those costs hit before your first customer walks through the door.
⚠️ Watch out:
Your opening order costs way more because you're starting from zero. Every spice, every bottle of oil, every basic ingredient needs purchasing.
The basics: determining your food cost percentage
Your purchasing budget connects directly to expected revenue and food cost percentage. Most restaurants run between 28% and 35% of revenue.
💡 Example calculation:
Expecting €40,000 revenue in month 1 with 30% food cost:
- Monthly purchasing: €40,000 × 0.30 = €12,000
- Plus startup inventory: €3,000
- Plus buffer for surprises: €2,000
Total purchasing budget month 1: €17,000
Calculating startup inventory
Before you flip that 'Open' sign, you need basic inventory covering 3-5 days of service. These are your must-have items that can't run out.
- Dry goods: Spices, oil, vinegar, pasta, rice
- Refrigerated essentials: Butter, eggs, milk, cheese
- Frozen backups: Vegetables, meat, fish for emergencies
💡 Example startup inventory bistro (50 covers/day):
- Dry goods: €800
- Refrigerated essentials: €600
- Frozen backups: €400
- Beverages (non-alcoholic): €300
Total: €2,100
Planning weekly purchasing
Once you're open, fresh products get ordered weekly. Base this on expected covers and your menu mix. Based on real restaurant P&L data, most operators underestimate their first month's volume by 15-20%.
Calculate per dish:
- How many portions will you serve weekly?
- What's the ingredient cost per portion?
- Add 10-15% for waste
💡 Example: Steak on the menu
Expecting 30 steak portions weekly
- Steak 200g × 30 = 6 kg at €28/kg = €168
- Garnish per portion €2.50 × 30 = €75
- Waste 10%: (€168 + €75) × 1.1 = €267
Weekly cost for this dish: €267
Buffer for unexpected costs
Always build in 15-20% extra for curveballs. Late suppliers, wrong orders, or that unexpected rush you weren't ready for.
⚠️ Watch out:
Your opening month typically sees 20-30% more waste. Your team's learning, portions aren't dialed in yet, and mistakes happen.
Seasons and price fluctuations
Factor in seasonal price swings. Vegetables and fish costs fluctuate significantly throughout the year.
- Winter: Fresh vegetables cost 20-40% more
- Summer: Fish prices spike during vacation season
- Holidays: Meat and premium ingredients increase
Suppliers and payment terms
New businesses rarely get credit terms. Plan on paying immediately or even upfront for your first few months of orders.
💡 Example cashflow impact:
Monthly purchasing €12,000 with different payment terms:
- Pay immediately: €12,000 cashflow hit day 1
- 14 days credit: €6,000 cashflow hit day 1
- 30 days credit: €0 cashflow hit day 1
Digital tools
Tools like KitchenNmbrs track your actual food cost and help adjust purchasing budgets based on real numbers. This prevents budget overruns before they happen.
How do you calculate a purchasing budget? (step by step)
Determine your expected monthly revenue
Estimate how many guests you expect and what your average bill will be. Be realistic — the first months are often quieter than you hope.
Calculate your food cost percentage
For restaurants, 28-35% is standard. Multiply your expected revenue by this percentage to get your monthly purchasing budget.
Add startup inventory and buffer
Add €2,000-€4,000 for basic inventory and 20% buffer for unexpected costs. This gives you your total purchasing budget for month 1.
✨ Pro tip
Stock exactly 72 hours worth of perishables for your opening week. This covers a weekend rush without tying up excessive cash in inventory that might spoil.
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 much money do I need for ingredients in month 1?
Calculate expected revenue × food cost percentage (28-35%) plus €2,000-€4,000 for startup inventory and buffer. For €40,000 revenue, budget €15,000-€18,000 total.
What if my actual food cost runs higher than planned?
That's typical in opening months. Monitor actual figures weekly and adjust purchasing patterns accordingly. Most new restaurants see 20-30% higher costs initially due to learning curves and waste.
Should I negotiate payment terms with suppliers before opening?
Absolutely try, but expect to pay immediately as a new business. Most suppliers require 3-6 months of payment history before extending credit terms. Factor this cash flow impact into your working capital planning.
📚 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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