How to Brew Kombucha at Home (and What It Costs)
A bottle of kombucha runs $3.50–$4.00 for 16 oz at the store. Brewed at home, a full gallon (about eight of those bottles) costs roughly what a single store bottle does. This guide covers how brewing works and what goes into the cost.
The short answer
Home kombucha is mostly tea, sugar and a starter culture. A gallon batch uses a few tea bags and about a cup of sugar, roughly $1–$2 of ingredients total. Split across eight 16 oz servings, that's a handful of cents per bottle, against $3.50–$4.00 at the store.
How brewing works
First fermentation
A SCOBY (symbiotic culture of bacteria and yeast) ferments sweet tea for about 7–14 days. The culture eats the sugar and turns the tea tart and lightly fizzy. This is the step that turns sweet tea into kombucha.
Second fermentation (optional)
Add a little fruit or juice, bottle it, and leave it sealed for a few more days. The trapped carbonation builds the fizz and the fruit adds flavor. Refrigerate when it's where you want it.
The SCOBY reuses itself
The SCOBY grows a new layer with every batch and goes straight into the next one, so your ongoing cost is little more than tea and sugar. One culture can keep a household supplied for batch after batch.
What goes into the cost
Tea and sugar (the recurring cost)
A few tea bags and about a cup of sugar per gallon is the whole recurring bill, roughly $1–$2 a gallon. Everything else you either own already or buy once.
Equipment (one-time, optional)
- 1-Gallon Brew Jar, about $18. The simplest way to start.
- Kombucha Starter Kit, about $45. It includes a live SCOBY.
- Continuous Brew Crock, about $80, for always-on brewing with a spigot.
Even the kit pays for itself within a handful of gallons compared with buying bottles, and a SCOBY you're given by a friend drops the startup cost to almost nothing.
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A quick word on safety
Use clean equipment, keep metal away from the SCOBY, and brew out of direct sun. That's most of what it takes to keep a batch healthy.
Try it yourself
Run your own numbers
The calculator needs to know how much kombucha you drink, what you pay per bottle now and which equipment you'd start with. From that it works out what you'd save each month and year, and how soon your setup covers its cost.
It takes about a minute, and there's nothing to sign up for.
Is it worth it?
For a regular kombucha drinker, easily. A gallon costs about what one store bottle does and replaces roughly eight of them, and the SCOBY keeps going for free. Even if you only buy a bottle now and then, a single brew jar and a starter culture pay off quickly. The calculator shows your break-even if you want to check first.
Safety note: kombucha is a raw, live fermented drink that naturally contains trace alcohol. Sanitize your equipment, discard any batch showing mold or smelling wrong, and ask a doctor first if you are pregnant, nursing, or immunocompromised. Full terms & disclaimers →