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Refractometer Correction

A refractometer reads true gravity before fermentation — but once alcohol is present it bends the light and the reading lies. Enter your original and current readings and get the real final gravity, with all five published correction formulas shown side by side so you see the disagreement instead of a false single answer. Brix or SG scale, full fermentation readout, and a self-calibrating wort correction factor.

5Formulas compared

1 dropSample needed

Any scaleVia refractive index

FullFermentation readout

Correct a reading taken during or after fermentation

Final gravity from a refractometer

Alcohol distorts the reading, so you need both the original reading and the current one. Enter them on whichever scale your refractometer uses.

Refractometer scale

Original reading (Brix) Current reading (Brix) Wort correction factor Default 1.04. Don't know yours? Use the Calibrate tab.

Correction formula

Refractometer Correction · A brewer's calculator

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Coefficients from published sources · verified

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Refractometer Correction

Final gravity from a refractometer

Original gravity from a refractometer

Calibrate your wort correction factor

Scale converter — through refractive index