Kombucha Second Fermentation Carbonation Calculator
Dial in your kombucha's fizz. Enter your bottle size, room temperature, and desired carbonation level to get a recommended sugar addition and estimated F2 fermentation time.
About this calculator
Estimate second fermentation time and sugar addition needed to hit your target carbonation level for kombucha based on room temperature and bottle size.
Frequently Asked Questions
Why does temperature matter so much for carbonation?
Warmer temperatures speed up yeast activity, producing CO2 faster. At lower temps, fermentation slows and bottles need more time to carbonate.
Can I add too much sugar during second fermentation?
Yes — excess sugar can lead to over-carbonation and bottle explosions. Always burp bottles daily and refrigerate once desired fizz is reached.
Does adding fruit juice affect carbonation time?
Fruit juice adds extra natural sugars, which can speed up carbonation slightly, so this calculator reduces the added sugar recommendation accordingly.