Refractometer Calculator
Correct refractometer readings during fermentation
Refractometer Readings
Alcohol affects refractometer readings. This correction is needed for accurate FG values during and after fermentation.
Reading before fermentation
Reading during/after fermentation
Corrected Final Gravity
1.012
SG
1.048
OG (SG)
4.7%
ABV
3.1
°Plato
About the Correction
This calculation uses the Sean Terrill formula to correct refractometer readings. Alcohol has a different refractive index than sugar water, which is why uncorrected values appear too high during fermentation.