Nearly 73% of restaurant managers struggle with price comparisons after suppliers change packaging sizes. Your beef supplier suddenly switches from 1kg packages to 2.5kg ones, or shrimp portions jump from 500g to 750g. These shifts can throw off your cost calculations completely.
Why package sizes change
Suppliers tweak their packaging for multiple reasons: streamlined logistics, new supply chains, or pure cost reduction. But this leaves you comparing different units entirely. You'll need to convert everything back to your standard measurements.
The basic formula for converting
Here's the foundation: Price per unit = Total price / Number of units
💡 Example:
Your supplier always delivered steak per kilo for €18.00. Now it only comes per 2.5 kg for €42.00.
- New package: 2.5 kg for €42.00
- Price per kilo: €42.00 ÷ 2.5 = €16.80
Result: €1.20 per kilo cheaper
Watch out for minimum order quantities
A cheaper per-kilo rate doesn't guarantee savings. If you typically use 1kg weekly but must now order 2.5kg, spoilage becomes a real concern. Calculate your true costs including potential waste.
⚠️ Heads up:
Bigger packages mean expanded storage needs. Verify your refrigeration space can handle the volume and products stay fresh throughout their shelf life.
Converting different units
Sometimes suppliers change both quantity and unit type. Going from per-kilo to per-piece pricing, or per-liter to per-bottle. This requires extra math.
💡 Example:
Shrimp came per 500 grams for €12.00. Now per piece, 20 pieces for €14.00.
- Old price: €12.00 per 500 grams = €24.00 per kilo
- New price: €14.00 for 20 pieces = €0.70 per piece
- Weight per piece: approximately 25 grams
- New price per kilo: €0.70 × 40 pieces = €28.00 per kilo
Result: €4.00 per kilo more expensive
Practical tips for converting
- Build a conversion reference: Document your standard unit for each ingredient (per kilo, per liter, per piece)
- Verify actual weights: Fresh products can have significant weight variations per piece
- Account for spoilage: Larger quantities often increase waste percentages
- Shop around: Other suppliers might still offer your preferred package sizes
Impact on your cost prices
Packaging changes can dramatically shift your food cost percentages. One of the most common blind spots in kitchen management is forgetting to recalculate dish costs after ingredient price adjustments. Review all affected recipes immediately after supplier changes.
💡 Example:
Your steak became €1.20 per kilo cheaper. At 200 grams per portion, this saves €0.24 per dish.
- Menu price: €28.00 (€25.69 excl. VAT)
- Old food cost: 32%
- New food cost: 31%
Extra profit: €0.24 per dish
Digitally tracking price changes
Food cost management tools like KitchenNmbrs let you update ingredient prices instantly and see their effect on dish profitability. You'll catch every price shift and maintain tight margin control.
How do you calculate the new price per unit?
Determine your standard unit
Choose a fixed unit in which you always calculate: per kilo, per liter, or per piece. This makes comparing between suppliers and time periods much easier.
Convert the new price
Divide the total price of the new package by the number of units. At €42 for 2.5 kg: €42 ÷ 2.5 = €16.80 per kilo.
Compare and update your cost prices
Compare the new price per unit with your old price. Immediately update your cost price calculations for all dishes containing this ingredient.
✨ Pro tip
Track your conversion calculations for 3 months after any package change - suppliers often adjust pricing again once they see ordering patterns shift. This data helps you negotiate better rates.
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 if the supplier switches from kilo to piece?
First weigh several pieces to find the average weight. Then calculate how many pieces make up one kilo and multiply by the per-piece price.
Do I always have to take the largest package if it's cheaper?
Not necessarily. Calculate whether you can use the product before spoilage occurs. Waste turns any bargain into an expensive mistake.
How often should I check my prices with suppliers?
Review your invoices monthly at minimum. Many suppliers quietly increase prices, particularly with fresh ingredients where market rates fluctuate regularly.
Can I negotiate about package sizes?
Often yes, especially with larger orders. Ask if they'll continue your previous package size, particularly if you're an established customer with consistent volume.
What if multiple ingredients become more expensive simultaneously?
Update all cost prices first, then analyze your food cost percentages. If they exceed 35%, menu price adjustments become necessary.
How do I handle seasonal weight variations in per-piece pricing?
Weigh samples monthly and adjust your calculations accordingly. Seasonal products like fish or produce can vary 15-20% in individual weights throughout the year.
📚 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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