Calculating draft beer costs is like trying to fill a bucket with holes in it - what goes in isn't what comes out. Most café and restaurant owners focus only on what they pay for beer, missing the hidden costs of foam and spillage. Your real cost per glass is higher than you think.
What is foam loss with draft beer?
Foam loss represents the gap between beer purchased and beer sold. It happens because of:
- Foam discarded during pouring
- Spillage and waste from first pours
- Line cleaning and tap maintenance
- Quality control tasting
Typical foam loss sits between 8% and 15%. Your tap setup and staff skill level determine where you land.
⚠️ Note:
Too many operators calculate with zero loss. Your cost price appears lower than reality, and every beer sold loses money.
The formula for actual draft beer cost price
Just like meat trim loss, you divide by yield rather than multiply by loss.
Formula:
Actual cost price per liter = Purchase price per liter / (Yield % / 100)
Where: Yield % = 100% - Foam loss %
💡 Example:
You purchase a 50-liter Heineken keg for €75.00:
- Purchase price: €75.00 / 50 liters = €1.50 per liter
- Foam loss: 12%
- Yield: 100% - 12% = 88%
Actual cost price: €1.50 / 0.88 = €1.70 per liter
Calculate cost price per glass
Use your actual cost per liter to find the real cost per serving:
Cost price per glass = (Actual cost price per liter × Glass size) / 1000
💡 Example:
Using the actual cost price of €1.70 per liter:
- Glass 25cl: €1.70 × 0.25 = €0.43
- Glass 33cl: €1.70 × 0.33 = €0.56
- Glass 50cl: €1.70 × 0.50 = €0.85
VAT and selling price
Alcoholic drinks carry 21% VAT, not the 9% rate for food. This impacts your pour cost calculations.
Pour cost % = (Cost price / Selling price excl. VAT) × 100
💡 Example pour cost:
You sell a 25cl beer for €2.90 including 21% VAT:
- Selling price excl. VAT: €2.90 / 1.21 = €2.40
- Cost price: €0.43
- Pour cost: (€0.43 / €2.40) × 100 = 17.9%
This represents a solid margin. Standard pour cost for beer runs 18-25%.
Reduce foam loss
Lower foam loss directly improves your margins. Based on real restaurant P&L data, these tactics make the biggest difference:
- Proper tap angle: 45 degrees, never straight down
- Clean glassware: grease-free and correct temperature
- Optimal tap pressure: have technician verify settings
- Staff training: smooth, continuous pouring motion
- Temperature control: beer and glasses at proper temperature
⚠️ Note:
Reducing foam loss by 5% (from 15% to 10%) saves €0.09 per liter. At 100 liters weekly, that's €468 additional profit annually.
Tracking and monitoring
Monitor kegs purchased against glasses sold. This reveals your actual foam loss versus your calculations.
Control formula:
Actual foam loss % = ((Purchased liters - Sold liters) / Purchased liters) × 100
Food cost management tools help track beverage costs and pour cost per product, showing foam loss impact on your margins.
How do you calculate the cost price of draft beer? (step by step)
Calculate the purchase price per liter
Divide the price of your keg by the volume in liters. A 50-liter keg for €75 costs €1.50 per liter.
Determine your foam loss percentage
Measure for one week how much you purchase versus sell. Common loss is 8-15%. If in doubt, calculate with 12%.
Calculate the real cost price
Divide the purchase price by the yield (100% minus loss). At 12% loss: €1.50 / 0.88 = €1.70 per liter.
Calculate the cost price per glass
Multiply the real cost price per liter by the glass size. A 25cl glass then costs €1.70 × 0.25 = €0.43.
Check your pour cost percentage
Divide the cost price by your selling price excl. 21% VAT. A healthy pour cost for beer is between 18-25%.
✨ Pro tip
Weigh your empty kegs before returning them to suppliers for 30 days straight. Most operators don't realize they're getting 2-3 liters less than advertised due to supplier foam during filling.
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's normal foam loss for draft beer?
Between 8% and 15% is typical. Well-maintained taps with trained staff often achieve 8-10%. Older systems or inexperienced staff can hit 15%.
Should I use 9% or 21% VAT for beer?
Alcoholic beverages always use 21% VAT, even in restaurants. Only food and non-alcoholic drinks qualify for 9% VAT.
How can I reduce my foam loss?
Train staff on proper pouring technique (45-degree angle, continuous motion), maintain clean glasses at correct temperature, and schedule regular tap system maintenance for pressure and cleaning.
What if my pour cost exceeds 25%?
You're losing money on every beer sold. Check your actual foam loss first - it might be higher than expected. If confirmed, either raise prices or switch to a less expensive brand.
Can I ignore foam loss with small volumes?
Absolutely not. Every cent matters in small operations. Just 5% extra loss on 50 liters weekly costs €195 annually in wasted product.
Why does my foam loss vary between different beer brands?
Different beers have varying carbonation levels and foam characteristics. Lagers typically foam less than wheat beers or highly carbonated imports.
📚 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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