Free Brewing & Fermentation Calculators

Quick, free tools for mead, wine, cider and beer makers, with no login and no ads. Every calculator updates live as you type, and uses the same formulas as the Fermolog app.

ABV CalculatorCalculate alcohol by volume from your OG and FG readings.

OG 1.050 · FG 1.010 OG 1.090 · FG 1.000 OG 1.070 · FG 1.005

Gravity ↔ Brix ConverterConvert specific gravity (SG) to Brix and back.

1.05 sg = brix 12.4 12 brix = sg 1.048 1.08 sg = brix 19.3

OG EstimatorEstimate original gravity from your ingredients before you pitch.

Mead · 3l1000g @80%Cider · 4l4300g @12%Beer · 19l3500g @75%

Backsweetening CalculatorDose honey, sugar or syrup to backsweeten a finished batch.

OG 1.000 · FG 1.010 OG 1.000 · FG 1.015 OG 1.000 · FG 1.010

Carbonation CalculatorWork out priming sugar to hit your target CO₂ level.

19L · 20°C2.4 vol · Table sugar (sucrose)19L · 4°C2.6 vol · Dextrose (corn sugar)5L · 20°C2.2 vol · DME (dry malt extract)

Weight & Volume ConverterConvert weight, volume and temperature between metric and imperial units.

5kg = 11.02lb 1gal = 3.79L 20°C = 68°F

Track the whole batch, not just the math

Fermolog logs your gravity readings, ABV, notes and photos automatically as you go. Download the free app to keep every batch in one place.

Download on iOS Get it on Android