How Much Sugar Is in Kombucha?
A cup of kombucha has about 8 g of added sugar on average — but the real number varies a lot by brand, since sugar feeds the fermentation and not all of it gets used up.
in 1 cup (240 ml) · about 1.9 teaspoons
- Per serving
- 8 g
- Per 100 g
- 3.3 g
- Type
- Added sugar
- In teaspoons
- ≈ 1.9 tsp
Fine in a portion — worth keeping an eye on.
Kombucha starts as sweet tea, and the sugar's job is to feed the fermentation culture, not to sweeten your cup directly. On average a serving still has around 8 g of added sugar, well below a can of Coca-Cola, but that average hides a wide range — fermentation time, straining, and flavourings all change how much sugar is left when it's bottled.
This is exactly why the label matters more with kombucha than with most drinks: some brands land near 2 g per bottle, others push past 15 g once fruit juice or syrup is blended back in for flavour. It's genuinely a better default than soda, but 'fermented' isn't the same claim as 'low sugar' — check the number, don't assume it.
Lower-sugar swaps
- Check the label — brands range from about 2 g to 12 g or more per bottle
- Dilute with sparkling water if a bottle reads high
Frequently asked questions
- Does kombucha have less sugar than soda?
- Usually, yes — a cup averages around 8 g versus roughly 39 g in a can of Coca-Cola, but always check the label since brands vary widely.
- Why does kombucha have any sugar if it's fermented?
- The sugar feeds the fermentation culture, but fermentation rarely consumes all of it, so some sugar remains in the finished drink.
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Sugar values from Typical nutrition label; actual amounts vary by brand, ripeness, and recipe. Last updated 2026-08-09.