The math behind a better brew.
Homebrew and coffee math in one place — ABV, strike water, carbonation, refractometer readings, and brew ratios. Every formula shown, no account needed.
ABV Calculator
Alcohol by volume from original gravity and final gravity — standard and alternate formulas, plus a quick-use Brix input.
Calculate ABVStrike Water Calculator
Mash-in water temperature to hit your target mash temp, accounting for grain weight and tun thermal mass.
Find strike tempPriming Sugar Calculator
How much sugar to add before bottling for your target CO₂ volumes — table sugar, corn sugar, or DME.
Calculate priming sugarBrix to Gravity Calculator
Convert your refractometer’s Brix reading to specific gravity — pre-fermentation and corrected for alcohol post-fermentation.
Convert BrixCoffee Ratio Calculator
Coffee and water amounts dialed to your brew ratio — enter any variable to solve for the others.
Dial your ratioCold Brew Calculator
Concentrate ratio and dilution — how much coffee and water for your batch, then how much water to add when serving.
Plan your batchGuides
Plain-English help: how to calculate ABV, priming and bottle carbonation, and coffee brew ratios explained.