Online Tool Store
Home Brewery Batch Log
Enter a batch's original and final gravity to calculate ABV and attenuation, logged alongside your recipe notes. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Example
Home Brewery Batch Log
Sample: batch #12, American Pale Ale
Example shown — replace it with your own batch details.
Result
How it works
- Enter your batch's original and final gravity.
- Add notes about the recipe and process.
- Get calculated ABV and attenuation, logged to your batch history.
The method
A standard homebrewing formula converts your gravity readings into ABV and attenuation percentage, giving you consistent numbers to track across batches.
FAQ
How is ABV calculated from gravity readings?
ABV is estimated from the difference between original gravity (before fermentation) and final gravity (after), using a standard homebrewing formula that approximates alcohol produced from sugar consumed.
What is attenuation?
The percentage of sugar converted to alcohol during fermentation — higher attenuation generally means a drier beer, since more fermentable sugar was consumed by the yeast.
Can I log multiple batches over time?
Yes — log each batch with its own recipe, gravity readings, and notes to build a history of your brewing results.
How we compare
| Feature | Online Tool Store | Paper brew log | Full brewing software suite |
|---|---|---|---|
| No software install | Yes | Yes | No |
| Quick to start | Yes | Fast but manual math | Setup required |
| Free to use | Yes | Free | Often paid |
For quick ABV math without a full brewing software suite, this covers the essentials faster.