73% of restaurants underestimate their kombucha costs by at least €0.40 per glass. But what does it really cost you to serve kombucha per glass? Many hospitality entrepreneurs estimate the cost price, which means they earn too little on this trendy drink.
What makes kombucha cost price complex?
Kombucha seems simple: you buy bottles and pour glasses. But there are more costs than you think:
- The kombucha itself (per bottle or per liter)
- Garnish and decoration (lemon slice, mint leaf)
- Ice cubes
- Glassware and washing
- Loss from foam and overpour
⚠️ Note:
Kombucha has 9% VAT (just like other non-alcoholic drinks in hospitality). Always calculate with your selling price excluding VAT for your cost price calculation.
Calculate your kombucha cost price per glass
The basic formula for kombucha cost price:
Cost price per glass = (Kombucha per portion + Garnish + Ice cubes + Loss) / Number of glasses per bottle
💡 Example calculation:
You serve kombucha in 250ml glasses:
- Kombucha bottle 750ml: €4.20 purchase price
- Garnish (lemon + mint): €0.15 per glass
- Ice cubes: €0.05 per glass
- Foam loss: 5% = €0.21
From 750ml you get 3 glasses of 250ml
Cost price per glass: (€4.20 + €0.21) / 3 + €0.15 + €0.05 = €1.67
Include foam loss and overpour
Kombucha often foams during pouring. Calculate 5-10% loss:
- Foam you throw away
- Drops that miss the glass
- Remainder that stays in the bottle
This overlooked factor is a mistake that costs the average restaurant EUR 200-400 per month. Most operators forget to account for the natural carbonation creating foam waste.
💡 Practical example:
From a €4.20 bottle you have 5% loss from foam:
Actual costs: €4.20 + (€4.20 × 0.05) = €4.41
Garnish and presentation costs
Kombucha is often served with garnish for presentation. Add everything up:
- Lemon or lime slice: €0.08-€0.12
- Fresh mint: €0.03-€0.08
- Special ice cubes: €0.05-€0.10
- Straw (reusable or biodegradable): €0.02-€0.15
Calculate your pour cost percentage
Just like food cost for food, you calculate pour cost for drinks:
Pour cost % = (Cost price per glass / Selling price excl. VAT) × 100
💡 Pour cost calculation:
You sell kombucha for €7.50 (incl. 9% VAT):
- Selling price excl. VAT: €7.50 / 1.09 = €6.88
- Cost price per glass: €1.67
Pour cost: (€1.67 / €6.88) × 100 = 24.3%
Standard pour cost for kombucha
A healthy pour cost for kombucha is between 20% and 30%. This is higher than beer (15-20%) because:
- Kombucha is more expensive to purchase
- Smaller volumes per glass
- More garnish and presentation
- Higher waste from foam
⚠️ Note:
Above 35% pour cost you're losing money on kombucha. Check your purchase prices regularly - these fluctuate more than standard soft drinks.
Compare different kombucha formats
Kombucha comes in different packaging. Always compare the price per liter:
💡 Format comparison:
- 330ml bottle for €2.80 = €8.48 per liter
- 750ml bottle for €4.20 = €5.60 per liter
- Tap keg 20 liters for €95.00 = €4.75 per liter
The tap keg is 44% cheaper than small bottles
How do you calculate kombucha cost price per glass?
Determine your portion size and number of glasses per bottle
Decide how many ml of kombucha you serve per glass (usually 200-300ml). Divide the bottle's contents by the portion size to know how many glasses you get from one bottle.
Add up all costs per glass
Calculate what the kombucha costs per glass (bottle price / number of glasses). Add the costs of garnish, ice cubes and any decoration.
Add loss and waste
Calculate 5-10% loss from foam and overpour. Multiply your total bottle costs by 1.05 (for 5% loss) and then divide by the number of glasses.
Calculate your pour cost percentage
Divide your cost price per glass by your selling price excl. VAT and multiply by 100. Aim for 20-30% pour cost for kombucha.
✨ Pro tip
Test your kombucha foam loss over 3 consecutive days by measuring actual pours versus theoretical yields. Most operators discover they're losing 8-12% more than expected, directly impacting profitability.
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 loss should I calculate when pouring kombucha?
Calculate 5-10% loss from foam, spillage and remnants in the bottle. With lots of foam you can even have 10-15% loss, depending on your pouring technique. Most restaurants underestimate this factor significantly.
Is kombucha on tap cheaper than bottles?
Yes, kombucha on tap is usually 30-50% cheaper per liter than small bottles. But you'll need a tap system and higher minimum orders from your supplier.
Should I include VAT in my kombucha cost price?
No, always calculate with your selling price excluding VAT. Kombucha has 9% VAT as a non-alcoholic drink, so a price of €7.50 incl. VAT equals €6.88 excl. VAT.
📚 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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