Brewing Tools
Free brewing calculators
Dial in recipe targets, brew day measurements, fermentation readings, mash temperatures, and unit conversions. Every calculator has its own dedicated URL. New to the vocabulary? Browse the homebrew glossary.
General
ABV Calculator
Alcohol by volume, apparent attenuation, and calories from OG and FG.
IBU Calculator
Bitterness from hop weight, alpha acids, boil time, and wort gravity.
Priming Sugar Calculator
Calculate priming sugar for bottle-conditioned homebrew.
Water Chemistry Calculator
Estimate ppm from gypsum, calcium chloride, epsom salt, table salt, baking soda, and magnesium chloride.
Pitch Rate & Starter Calculator
Calculate pitch-rate targets, estimate viable yeast cells from package age and viability, and size a starter to hit your cell count goal with DME addition.
Brix & Refractometer Calculator
Convert Brix to specific gravity and correct refractometer readings during active fermentation. Supports a wort correction factor for accurate in-fermentation gravity estimates.
Gravity Correction Calculator
Fix high or low gravity on brew day. Calculate dilution water to lower gravity, or DME addition and boil-off time to raise it, while preserving total gravity points.
Hydrometer Correction Calculator
Correct hydrometer readings for any sample temperature. Enter your observed gravity, sample temperature, and hydrometer calibration temperature to get the true specific gravity.
Hop Freshness Calculator
Estimate how much alpha acid your hops have lost based on storage time, temperature, packaging type, and the hop variety's Hop Storage Index (HSI) stability rating.
Converters
Mash
Mash Strike & Rest Calculator
Calculate strike water temperature for single-infusion mashes and infusion volumes for step mash rest changes. Accounts for grain temperature and mash-tun heat capacity.
Mash-Tun Calibration Calculator
Measure your mash-tun heat capacity in equivalent liters of water using a simple hot-water rest. Use the result to improve strike temperature accuracy in future batches.
Settings
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