Brix to specific gravity calculator

Refractometers read Brix; recipes and hydrometers use specific gravity. Convert one to the other for a wash or wort that hasn’t started fermenting.

Gravity

1.083SG

20.0 °Bx is a gravity of 1.083.

Brix to SG SG to Brix

Brix °Bx

How it works

Brix is the percentage of sugar by weight. These are the usual fits to the sugar tables:

SG = 1 + Brix ÷ (258.6 − (Brix ÷ 258.2) × 227.1)

Brix = ((182.4601 × SG − 775.6821) × SG + 1262.7794) × SG − 669.5622

From 0 to 30 °Bx (1.000 to 1.129) the two agree to within 0.02 °Bx. Plato is within 0.1° of Brix over that range, so the same figures serve for °P.

20.0 °Bx is a gravity of 1.083, and a gravity of 1.080 is 19.3 °Bx.

Once fermentation starts, alcohol skews a refractometer’s reading and these conversions no longer hold. Use a hydrometer from then on.
Below 1.000 there is no sugar left for Brix to measure.
The sugar wash calculator turns a target gravity into the sugar to weigh out.

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