Refractometers are a great way to sample gravity, however once alcohol is created during fermentation they will require a few calculations to correct the reading. The calculators below will convert Orignal Brix to Original Gravity (pre fermentation only) and will convert Original/Final Brix to Final Gravity and ABV% (during and post fermentation) without the need to use a hydrometer. Formulas source is Primetab and Realbeer.

Brix to Specific Gravity
Enter Brix:

Specific Gravity:

Corrected Final Gravity & ABV% by Brix
Enter Original Brix: Enter Final Brix:

Final Gravity: Index of Refraction:

Alcohol By Weight%: Alcohol By Volume%: