Some brewing questions don't need a full calculator — they need a chart you can glance at once and remember, or a short explanation of why two respected sources disagree with each other. This section is exactly that: short, data-led reference pages that answer one specific, commonly-searched question directly, usually with a table.
Every number in every chart here is computed by the same calculation core the site's six interactive tools use — there's no separate, hand-typed copy of the maths sitting in a spreadsheet somewhere that could quietly drift out of sync with what the tools actually compute. Where two methods genuinely disagree — Tinseth versus Rager for IBU, apparent versus real attenuation for how "done" a fermentation looks — the page explains why, rather than picking a winner and hiding the disagreement.
The charts split roughly into three groups: conversion references (SG to Plato/Brix, gallons to litres, Fahrenheit to Celsius at the temperatures that actually come up during brewing), targets and quick lookups (CO2 volumes by style, priming sugar CO2 targets by style, common ABV ranges by style), and explainer pages that exist specifically because a bare number without context gets misapplied (why Tinseth and Rager disagree, when to dilute versus when to blend, what a refractometer correction actually does and why it's necessary).
If you already know exactly what you're calculating and just need your own numbers plugged in, the six calculators under Tools will get you there faster. This section is for the adjacent question — the one where you don't have your own numbers yet, or you're trying to sanity-check a number a calculator already gave you.
Every chart states which of the site's six calculators it draws from, so if a table doesn't cover your exact situation — a batch size or CO2 target that falls between two rows, say — the linked calculator will compute your specific case directly rather than making you interpolate between two nearby table entries by hand. New charts get added whenever a genuinely common question surfaces that a table answers better than a full interactive tool would — usually a question that's come up repeatedly enough in feedback to be worth a dedicated, permanently linkable answer.