Skip to content
Docs · Tools

Tools overview

The free calculators on the Tools hub — proof gallons, proofing down, weight gauging, temperature correction, and estimates for brewers, winemakers, cidermakers, and mead makers — on the public site and inside the app.

Tools is a set of quick-reference calculators for the arithmetic that comes up across the craft: turning a volume and a proof into proof gallons, working out the water a cut needs to come down to 100°, gauging a package by its weight, correcting a hydrometer reading taken warm, estimating a beer's bitterness from its hop bill, sizing a priming-sugar addition, and estimating alcohol for wine, mead, and cider. They each do one calculation, and they show the answer as you type.

The calculators are free for everyone and need no account. Nothing you enter is saved or sent anywhere — the math runs right in your browser, so the numbers are yours and they stay on your screen. They're a handy front door to Brewstiller, not a compliance filing: every page carries a plain note at the bottom that these are reference tools, not a system of record for a TTB or state filing.

The two ways in

The exact same calculators live in two places, so you can reach them whether or not you're signed in:

  • On the public site, in the top navigation, choose Tools. This opens the Tools hub with no account and no sign-in — bookmark it, or send it to a friend who isn't a Brewstiller user. The intro reads "Free calculators for brewers, winemakers, distillers, cidermakers, and mead makers — quick reference, no account required."
  • Inside the app, in the navigation, choose Tools. You get the same calculators without leaving the app mid-batch. They're on every plan, hobby and commercial alike — there's no upgrade to unlock them.

Either way you land on the Tools hub, a page of calculator cards. Choose Open calculator on a card to open it; a ← Tools link at the top of every calculator takes you back to the hub.

What's on the hub

The hub groups the calculators by how much you can lean on them.

Compliance-grade calculators follow the published TTB procedures step for step (including the rounding, which is part of the procedure):

  • Proof Gallons — turn a measured volume and its proof into wine gallons and proof gallons. See Proof gallons calculator.
  • Proofing Down — find the water needed to bring spirits down to exactly 100° proof. See Proofing-down calculator.
  • Weight to Proof Gallons — gauge by scale: convert a net weight into wine gallons and proof gallons, and convert between wine and proof gallons. See Weight-to-proof-gallons calculator.
  • Temperature Correction — correct a hydrometer proof reading taken off 60 °F to its true proof at 60 °F. See Temperature correction calculator.

A small note under this group repeats that even these are quick estimates for reference — tools, not official TTB filings or gauge records.

Estimates (non-regulatory) are set apart in their own boxed section, marked Not an official measurement, because they use industry conventions with no government formula behind them. The section carries its own warning: "These tools use industry conventions with NO official government formula or source. Never use them for a tax or label filing." The calculators here are:

  • ABV from Gravity — estimate ABV from an original and final gravity reading. See ABV-from-gravity calculator.
  • IBU Calculator — estimate a beer's bitterness from its hop bill (Tinseth, Rager, or Garetz). See IBU calculator.
  • Priming Sugar — find the priming sugar to bottle-condition beer to a target carbonation. See Priming sugar calculator.
  • Brix to Potential Alcohol — estimate a wine must's potential alcohol from its Brix or specific gravity. See Brix to potential alcohol calculator.
  • Chaptalization — find the sugar to raise a wine must from its current Brix to a target Brix. See Chaptalization calculator.
  • Mead Honey — estimate the honey to hit a target original gravity for a batch of mead. See Mead honey calculator.
  • Cider ABV — estimate a cider's potential alcohol from its juice specific gravity. See Cider ABV calculator.

Every calculator in this group opens with a Non-regulatory estimate badge and a highlighted note that it's a reference estimate, never valid for a tax or label filing.

Even the compliance-grade calculators are for reference — they help you check your work, but the number that governs a filing is the one from your own measurement and records, not a browser calculator.