Purchase prices shift constantly, and most restaurant owners don't track the impact until it's too late. Meat prices jump 20% overnight, vegetable costs plummet, oil spikes again. Your profit margin disappears silently while your menu prices stay frozen.
Why calculate purchase price risk?
Most restaurant owners set menu prices and forget them for months. Meanwhile, suppliers quietly bump prices by 10%, 15%, sometimes 20%. Your food costs climb, but selling prices don't budge.
⚠️ Watch out:
A 15% increase in purchase prices can push your food cost from 30% to 35%. On €500,000 annual turnover, you're bleeding an extra €25,000.
The basic formula for price risk
Calculate risk by measuring how price increases hammer your food cost percentage:
New food cost % = (Old ingredient costs × (1 + price increase %)) / Selling price excl. VAT × 100
? Example:
Your steak costs €9.00 in ingredients, sells for €32.00 incl. VAT (€29.36 excl.):
- Current food cost: €9.00 / €29.36 × 100 = 30.7%
- Meat price jumps 20%: €9.00 × 1.20 = €10.80
- New food cost: €10.80 / €29.36 × 100 = 36.8%
Impact: +6.1 percentage points
Risk analysis per ingredient
Not all ingredients carry equal risk. Break them down like this:
- Main ingredients: Meat, fish - massive impact on cost price
- Basic ingredients: Oil, butter, flour - small per-portion impact, but they're everywhere
- Specialties: Truffles, oysters - pricey but limited dish count
Target ingredients costing more than €2.00 per portion. That's where you'll find the real damage. Something most kitchen managers discover too late is that tracking every ingredient creates analysis paralysis - focus on the heavy hitters first.
Include seasonal risk
Some products follow predictable patterns:
- Tomatoes: Winter prices spike 40%, summer brings relief
- Asparagus: Seasonal rollercoaster, prices crash mid-season
- Shellfish: Holiday premiums hit hard
? Example seasonal impact:
Your tomato soup in January vs. August:
- January: €3.20 ingredient costs (premium tomatoes)
- August: €2.10 ingredient costs (abundant supply)
- Selling price: €8.50 (€7.80 excl. VAT)
Food cost January: 41% | Food cost August: 27%
Spread supplier risk
Multiple suppliers for critical ingredients = insurance policy. One supplier jacks prices 25%? Switch temporarily to another.
Calculate the gap between your priciest and cheapest supplier per ingredient. This shows your switching room.
? Example supplier difference:
Beef per kilo:
- Supplier A: €28.00/kg
- Supplier B: €31.50/kg
- Difference: €3.50/kg = 12.5%
At 200g per portion, you save €0.70 per dish.
Menu price adjustment triggers
Set clear thresholds for price moves. Most restaurants use this framework:
- Food cost above 35%: Raise menu price or tweak recipe immediately
- Food cost 32-35%: Monitor closely
- Food cost below 32%: Room for premium ingredients or higher margins
Alternative ingredients as buffers
Always keep backup ingredients ready:
- Salmon too pricey? Pivot to sea bream
- Beef costs climbing? Push pork specials
- Lobster unaffordable? Feature langoustines instead
Pre-calculate food costs for these alternatives so you can pivot fast.
Digital price monitoring
Manual price tracking eats time. Systems that automatically monitor ingredient prices and calculate food cost impacts save hours weekly.
You'll spot which dishes breach your target food cost instantly and make quick pricing decisions.
How do you calculate purchase price risk? (step by step)
Inventory your main ingredients
Make a list of all ingredients that cost more than €2.00 per portion. These are your risk ingredients. Note the current purchase price and consumption per dish.
Calculate the impact of price increases
For each risk ingredient, assume a price increase of 15%. Calculate the new ingredient costs and the new food cost percentage. Use the formula: (new ingredient costs / selling price excl. VAT) × 100.
Set action thresholds
Determine at what food cost percentage you take action. For example: above 35% you adjust the menu price, between 32-35% you look for alternatives. Make this clear to yourself in advance.
✨ Pro tip
Track your 8 most volatile ingredients weekly in a simple spreadsheet. Calculate the exact food cost impact if each ingredient jumps 25% - this 15-minute exercise can save you €400+ monthly in unnoticed price creep.
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 check my purchase prices?
What if my supplier suddenly charges 30% more?
Should I adjust menu prices immediately when costs increase?
How do I prevent sticker shock from price increases?
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
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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