Brewing tools
Calculators that match your batch
Free brewing calculators for ABV, gravity correction, carbonation, strike water, IBU, yeast pitch rate and more. Share any calculation with a link.
Choose a tool
ABV Calculator
Calculate ABV, attenuation, calories and carbs from OG and FG.
Hydrometer Temperature Correction
Correct your hydrometer gravity reading for sample temperature in SG, Plato or Brix.
Refractometer Correction
Convert refractometer Brix readings to gravity and estimate FG and ABV in fermenting beer, including correction factor.
Gravity Correction
Fix a missed gravity reading: add DME, LME or sugar, dilute with water, or extend the boil.
Strike Water Temperature
Find the strike water temperature to hit your mash target, with grain temp, tun heat capacity and °C/°F units.
Mash Rest / Infusion Temperature
Work out how much boiling water to add to hit your next mash rest temperature.
Mash Tun Calibration
Measure your mash tun heat capacity as an equivalent water volume in liters, with the same formula as the Brewfather app for strike and rest temps.
Carbonation
Work out bottle priming sugar, keg priming, or forced-carbonation PSI from CO2 volumes and temperature.
IBU Calculator
Estimate beer bitterness from hop additions with Tinseth, Rager, Garetz or Noonan, including hop stands.
Hop Freshness Calculator
Estimate alpha acid lost during hop storage from age, temperature and packaging — same formula as the Brewfather app.
Yeast Pitch Rate & Starter
Work out how much yeast to pitch and the starter size to grow it.
Gravity Unit Conversion
Convert specific gravity, gravity points, degrees Plato and Brix instantly.
Beer Color Converter
Convert beer color between SRM, EBC and degrees Lovibond with a live glass swatch.
Volume Unit Converter
Convert liters, gallons, ml, fluid ounces, pints and barrels with live updates as you type.
Weight Unit Converter
Convert kilograms, grams, pounds, ounces and stones with live updates as you type.
Temperature Unit Conversion
Convert temperatures between Celsius, Fahrenheit and Kelvin instantly.
Pressure Unit Conversion
Convert pressure between psi, bar, kilopascals and atmospheres instantly.
These calculators live inside every recipe
In the Brewfather app the same math runs live in your recipes and batches — water chemistry, mash pH, yeast starters and all. Available free in the Brewfather app.