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Fermentation Starter Brix & Timelapse Tracker

· Last updated：2026-08-08

Log Brix / specific-gravity readings over time, plot the decay curve, compute apparent attenuation & projected ABV, and predict the fermentation end-point

Details

What this tool helps you do

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.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Science & Education
Input types
select, number, textarea
Output type
html
Sample coverage
4
API ready
Yes

Overview

Track home fermentation with time-based Brix or specific-gravity readings. The tool converts between Brix and SG, plots density decay, calculates apparent attenuation and projected ABV, and estimates when fermentation may reach a target endpoint.

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

  1. 1Choose the starter type, such as kombucha, water kefir, sourdough starter, beer, wine, mead, or generic.
  2. 2Optionally enter a target final Brix or SG, or use the default target for the selected type.
  3. 3Enter one reading per line using time in hours followed by the value, such as `24 1.045` or `48 5.5`.
  4. 4The 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.

Examples

1. Kombucha gravity drop over 5 days

Home kombucha brewer

Background

A home brewer records daily specific-gravity readings during a first ferment and wants to compare the trend with a 1.010 endpoint.

Problem

The brewer needs a quick view of density decay, projected fermentation results, and an estimated completion time.

How to use

Select `Kombucha`, enter `1.010` as the target final value, and paste the hourly readings into the readings field.

Type: kombucha
Target final: 1.010
Readings:
0 1.060
24 1.050
48 1.038
72 1.028
96 1.020

Outcome

The tool plots the falling SG curve, reports attenuation and projected ABV, and estimates when the trend may reach 1.010 with an R² confidence note.

2. Water kefir tracked in Brix

Water-kefir enthusiast

Background

A fermenter uses a refractometer to record sugar readings during a short water-kefir fermentation.

Problem

The readings are in Brix, so the fermenter wants the curve and endpoint estimate without manually converting each value.

How to use

Select `Water kefir`, leave the target empty to use its type default, and enter the Brix readings by hour.

FAQ

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?

No. It is a local, deterministic tracking tool intended for home fermentation reference.

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Type: kefir
Readings:
0 8.0
24 5.5
48 3.2

Outcome

The tool interprets the values as Brix, converts them for the density analysis, plots the decline, and provides the calculated fermentation metrics and endpoint estimate.