behind the numbers —

The science behind every calculation.

A living brewing science library — the formulas, the reasoning, and the sources behind every number in the builder. Browse by topic from the sidebar.

Start here

Four picks to set the foundation.

A quick start guide — what the builder calculates, what to set up first, and how to use the numbers on brew day.

Tinseth utilization, whirlpool hops, dry-hop bitterness, and the science of iso-alpha acids.

How original gravity is built from your grain bill, and the path from OG to FG to alcohol.

Source profiles, style targets, the auto-calculator, and what ions do to your beer.

What’s inside

How To Use Brewing.It

IBU & Bitterness · Gravity & ABV · Water Chemistry · Mash pH · Mash Temperature · Yeast Starters · Hop Flavor Radar