This is an enhanced version of my beer ABV calculator, which now works for both hydrometer and refractometer homebrewers. Please note that the calculations are a little different to those used in the previous version; this is intentional and this new calculator should be more accurate.
All the code is available on Github, along with details on the exact formulae being used and where they came from. It has recently been updated, and should now be a lot more mobile-friendly!
The Wort Correction Factor is generally required for refractometers which measure in Brix; unless you know better, it is best to leave it at the default value.
Share and Enjoy!