Brew-day math, dialed in.
Thirty-six focused calculators for gravity, hops, water, yeast, carbonation and equipment. Free, fast, and built for your phone in the brewhouse. Every result shows the formula it came from.
Mash pH & Water Chemistry
Salt additions, ion levels, residual alkalinity, estimated mash pH and the sulfate-to-chloride balance. The tool spreadsheets and paid apps make you work for - free and instant.
All 40 calculators
Ten categories, every brew-day numberGravity & ABV
Measurement & Conversion
Recipe, Efficiency & Colour
Hops & Bitterness
Water & Mash Chemistry
Mash & Temperature
Yeast & Fermentation
Carbonation & Packaging
Cider, Mead & Sugar
Kettle & Equipment
Why Brewers Math?
Most brewing calculators are either buried inside a heavyweight recipe app behind a login, or - for water chemistry - locked in a downloadable spreadsheet you need a tutorial to operate. Brewers Math is the opposite: every tool is a single, focused, fast page that works on your phone on brew day, runs entirely in your browser, and shows the formula and cites its source so you can trust the number.
Plan a recipe's original gravity and colour, dial in IBU and mash water, size your yeast starter, then prime or carbonate the finished beer. It's all here, and it's all interlinked.