About Brewers Math

Brewers Math is a free suite of 31 homebrew calculators covering the numbers you actually compute on brew day - gravity and ABV, hop bitterness, water chemistry and mash pH, carbonation, temperatures and yeast.

What makes it different

1. 01 No login, no paywall. Every tool works immediately and runs entirely in your browser.
2. 02 One focused page per calculator. Fast to load, easy to use on a phone in the brewhouse.
3. 03 It shows its work. Each calculator displays its formula and cites the canonical source - from Tinseth and Rager to Palmer, Kolbach and Brungard - so you can trust the number.
4. 04 The water-chemistry math, unlocked. Our mash pH & water calculator does for free what most brewers still reach for a spreadsheet or paid app to do.

How accurate are the results?

The calculators implement published, peer-used brewing formulas and are covered by an automated test suite (144 checks, plus a frozen regression snapshot). That said, brewing is variable: results are planning estimates. Always confirm critical values - mash pH, final gravity, carbonation - against your own calibrated measurements.

A note on responsible brewing

These tools are for adults of legal drinking age making beer at home where it is legal to do so. Brew and drink responsibly.