Brew-day math, dialed in.
Thirty-one focused calculators for gravity, hops, water, yeast and carbonation. 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 31 calculators
Nine 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
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.