# Fermentation Starter Brix & Timelapse Tracker Log Brix / specific-gravity readings over time, plot the decay curve, compute apparent attenuation & projected ABV, and predict the fermentation end-point > Canonical page: https://elysiatools.com/en/tools/fermentation-starter-brix-and-timelapse-tracker - **Category:** Science & Education - **Keywords:** fermentation, brix, specific gravity, sg, abv, attenuation, kombucha, kefir, sourdough, homebrew, refractometer, hydrometer ## Overview For home brewers and kombucha / water-kefir / sourdough enthusiasts. Enter time-stamped Brix or specific-gravity readings; the tool converts Brix↔SG (Beer Maverick formula SG = Brix/(258.6 − (Brix/258.2)×227.1) + 1), plots the density decay curve, computes apparent attenuation AA% = (OG−FG)/(OG−1)×100 and projected ABV ≈ (OG−FG)×131.25. A log-linear least-squares fit on the density decay extrapolates to the target endpoint to predict completion (with an R² confidence note). Pure local, deterministic, no network. For home fermentation only. ## Inputs - **Starter type** (select) - **Target final Brix/SG** (number): Optional, e.g. 1.005 or 5 (Brix). Leave empty for type default. - **Readings (time, value)** (textarea): One reading per line: time(h) then value. 0 1.060 24 1.045 48 1.030 72 1.020 (Mix Brix & SG freely — values >1.5 read as Brix) ## When to use - Monitor kombucha, water kefir, beer, wine, mead, or sourdough starter fermentation over time. - Combine refractometer Brix readings and hydrometer-specific-gravity readings in one log. - Estimate fermentation completion from a target final Brix or SG and the observed density trend. ## How it works - Choose the starter type, such as kombucha, water kefir, sourdough starter, beer, wine, mead, or generic. - Optionally enter a target final Brix or SG, or use the default target for the selected type. - Enter one reading per line using time in hours followed by the value, such as `24 1.045` or `48 5.5`. - The tool converts Brix and SG values, plots the decay curve, calculates attenuation and projected ABV, and extrapolates an endpoint with an R² confidence note. ## Use cases - Compare daily kombucha gravity readings against a preferred final SG. - Track water kefir sugar reduction with refractometer Brix measurements. - Estimate beer, wine, or mead attenuation and projected ABV from original and later gravity readings. ## Frequently asked questions ### What format should the readings use? Enter one reading per line as time in hours followed by the value, for example `0 1.060` or `24 5.5`. ### Can I mix Brix and SG readings? Yes. Values greater than 1.5 are interpreted as Brix, while lower values are treated as specific gravity. ### What does the tool calculate? It calculates the density curve, apparent attenuation, projected ABV, and an estimated time to reach the target endpoint. ### What happens if I leave the target empty? The tool uses the default target for the selected starter type. ### Is this suitable for commercial fermentation control? 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