Home Brewing Calculators

These calculators cover the numbers of a brew day. Work out the recipe (OG, FG, ABV, colour, IBU), the mash water and strike temperature, and the yeast starter. Then check gravity with the hydrometer and Brix tools, carbonate with priming sugar or keg pressure, and convert spirit strength with the proof calculator.

Tools in this group

• ABV Calculator (Alcohol by Volume) — Enter the original and final gravity to get the alcohol by volume, alcohol by weight and attenuation.
• Beer Recipe Calculator (OG, ABV, SRM, IBU) — Enter your grains, batch volume, brewhouse efficiency and yeast attenuation to get OG, FG, ABV, colour, IBU and the bitterness ratio, or enter a measured OG to find your efficiency.
• Brewing Water Calculator — Enter your water volume, your starting water report and the salts you add to see the ion levels, alkalinity and residual alkalinity.
• Brix to SG Calculator — Convert Brix to specific gravity or back, correct a refractometer reading taken during fermentation and estimate alcohol.
• IBU Calculator (Beer Bitterness from Hops) — Enter your hop additions, boil gravity and batch volume to get the total IBU, the IBU of each addition and the utilization used.
• Mash Water Calculator (Strike Temperature, Mash and Sparge Water) — Enter your grain weight, temperatures and water-to-grain ratio to get the strike water temperature and the mash and sparge water volumes.
• Mead Calculator — Enter your batch size and honey to get the original gravity and ABV, or enter a target OG or ABV to see how much honey to buy.
• Original Gravity Calculator (Hydrometer Tools) — Correct a hydrometer reading for temperature, work out how much water to add or boil off to reach a target gravity, or get the original gravity from ABV and FG.
• Priming Sugar Calculator (Bottle Priming and Keg Carbonation) — Enter the batch size, the warmest temperature and the carbonation you want to get the weight of priming sugar, or switch to a keg to get the regulator pressure.
• Proof Calculator — Enter an ABV or proof to convert it, or the volume and strengths of a spirit to get the water to add, the blend, or the proof gallons.
• Yeast Starter Calculator (Pitch Rate, Starter Size and DME) — Enter your batch volume, gravity and the yeast you have to see how many cells you need, and the starter size and DME that closes the gap.