What Is a Kombucha Sugar Ratio Calculator?
Kombucha's sweet-tea base follows a well-established homebrew ratio: about 1 cup of sugar and 8 tea bags per gallon of water, plus starter liquid from a previous batch. This calculator scales that standard recipe up or down to your exact batch size, in gallons or liters, so you can brew anything from a small jar to a large batch with the same reliable ratio.
Getting the sugar ratio right matters — too little starves the SCOBY culture and slows fermentation, while too much can throw off the balance of the finished brew and slow the culture's ability to properly acidify the tea.
How to Read Your Results
Sugar Needed
Shown in both cups and grams so you can measure with whichever tool is more convenient — a kitchen scale is generally more precise than a cup measure.
Tea Bags Needed
Scaled from the standard 8 bags per gallon. Loose-leaf tea drinkers can substitute roughly 1 tablespoon of loose tea per tea bag.
Starter Liquid Needed
This is fermented kombucha from a prior batch (or store-bought raw, unflavored kombucha), used to lower the pH of the new batch quickly and protect it while the SCOBY re-establishes.
Real-World Example
A standard 1-gallon batch, the most common home-brewing size:
| Ingredient | Amount |
|---|---|
| Sugar | 1.00 cup (200 g) |
| Tea bags | 8.0 bags |
| Starter liquid | 2.00 cups |
Scaling to a 3-liter batch (about 0.79 gal) would proportionally reduce each amount to roughly 0.79 cups of sugar, 6.3 tea bags and 1.58 cups of starter liquid.
Tips for Kombucha Brewing
- Dissolve sugar fully in hot tea, then cool the sweet tea to room temperature before adding the SCOBY.
- Use non-chlorinated water — chlorine can harm the culture. Filtered or dechlorinated tap water works well.
- Keep metal away from the SCOBY during fermentation — use glass, ceramic or food-grade plastic vessels and utensils.
- Taste-test after 7–10 days and continue fermenting until the balance of sweet and tart suits you.
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Last updated: August 2026 · Reviewed by: Simple Calculator Tools Editorial Team