Kombucha is a fermented tea drink that many people reach for as a lighter alternative to soda, but its nutrition can vary noticeably depending on whether you choose a plain, flavored, or hard variety. This kombucha nutrition calculator estimates the calories, carbohydrates, sugars, protein, caffeine, and alcohol in any serving size — just enter your volume and pick the style closest to what you are drinking.
Whether you are counting calories, tracking carbs on a low-sugar or keto plan, brewing your own batch, or comparing store-bought bottles, this tool gives you quick, realistic numbers based on commonly published average values. You can switch between fluid ounces, milliliters, and cups, and use the preset buttons for the most common bottle and can sizes.
Remember that actual nutrition can differ by brand, added fruit juice, tea strength, and fermentation time, so treat the output as a helpful estimate rather than a precise lab result.
🍶 Enter Your Kombucha Serving
How to Use This Calculator
Start by entering the amount you plan to drink. You can type any volume, or tap one of the preset quick-fill buttons for common containers: 8 oz bottle, 12 oz can, 16 oz bottle, or 250 ml glass. Choose the unit that matches your input, then select the kombucha style closest to your drink.
- Plain / Original — unflavored fermented tea, usually the lowest in sugar.
- Flavored — contains added fruit juice, ginger, or botanical extracts, which raises sugar and calories.
- Hard — alcoholic kombucha with a second fermentation and added alcohol, typically around 4.5% ABV.
Hit Calculate and the result panel will show calories, carbs, sugars, protein, caffeine, and alcohol where relevant for your exact serving. A breakdown line explains how the estimate was built from per-100 ml reference values.
Why Style Matters for Your Numbers
Kombucha is made by fermenting sweetened tea with a symbiotic culture of bacteria and yeast (SCOBY). During fermentation, the yeast and bacteria consume much of the added sugar and produce organic acids, carbon dioxide, and trace alcohol. The final composition depends on how long the fermentation runs, what kind of tea is used, and whether extra flavorings are added after the first ferment.
If you are comparing brands, the biggest single variable is sugar. A low-sugar labeled kombucha can have as little as 2–4 g per serving, while an indulgent flavored variety can reach 12 g or more. Because kombucha contains essentially no fiber or protein, the net carbs are usually the same as total carbs.
Reference Values Used in the Calculator
The tool uses these rounded average values per 100 ml (about 3.4 fl oz). They are compiled from nutrition labels and commonly cited commercial data, not from a single lab sample.
| Style | Calories | Carbs | Sugars | Caffeine | Alcohol |
|---|---|---|---|---|---|
| Plain / Original | 12.5 kcal | 3.3 g | 3.3 g | 4.2 mg | <0.5% |
| Flavored | 16.7 kcal | 4.2 g | 4.2 g | 4.2 mg | <0.5% |
| Hard / Alcoholic | 28.2 kcal | 1.1 g | 0.4 g | 4.2 mg | 4.5% |
Protein is essentially zero in all three styles, so it does not appear in the table. Caffeine is an estimate based on a typical black or green tea base; some brands use more tea leaves or add green tea extract, and decaf versions are available.
Worked Example
Suppose you pour one 16 fl oz bottle of plain kombucha. First convert the volume: 16 fl oz × 29.57 = 473 ml. That is 4.73 times the 100 ml reference. The estimated nutrition is:
- Calories: 12.5 × 4.73 ≈ 59 kcal
- Total carbs: 3.3 × 4.73 ≈ 15.6 g
- Sugars: 3.3 × 4.73 ≈ 15.6 g
- Caffeine: 4.2 × 4.73 ≈ 19.9 mg
If the same 16 oz bottle were a flavored variety, the calories would rise to about 79 kcal and sugar to about 19.9 g. If it were hard kombucha, carbs would drop to roughly 5.2 g but you would add about 16.8 g of alcohol.
Tips & Best Practices
- Check the label anyway. The calculator is a guide, not a substitute for the Nutrition Facts panel on the specific bottle you are drinking.
- Watch serving sizes. Many brands market a bottle as one serving, but some split a 16 oz bottle into two 8 oz servings — that changes everything.
- Track sugar separately on low-carb or keto plans. Since kombucha has no fiber, net carbs equal total carbs. If you need to compare more beverages, try the drink net carbs calculator.
- Use the reset button to start a new comparison. You can run the calculation several times for plain vs flavored vs hard to see the trade-off between sugar and alcohol.
- Homebrewers: fermentation time is your sugar dial. A shorter first ferment leaves more residual sugar; a longer ferment produces a drier, tarter tea with lower sugar but a slightly higher alcohol content.
Limitations & Precision Notes
Kombucha is a living product. Bottles from the same brand, even the same batch, can differ because the SCOBY continues to metabolize sugar in the bottle. Cold-chain storage slows this process, but it never fully stops. As a result, any nutrition estimate should be treated as an approximation with a realistic error margin of maybe 20–30% on sugar.
The caffeine estimate assumes a standard black or green tea base and does not account for yerba maté, guayusa, or herbal blends. Hard kombucha ABV can range from roughly 3% to 7% depending on the brand and process; the calculator uses 4.5% as a middle-of-the-road value. If you are using this for medical, athletic, or pregnancy-related decisions, always verify against the manufacturer's official lab data and consult a qualified professional. For broader calorie comparisons across beverages, the beverage calories per ounce calculator can be a helpful complement.