Digital download · Print at home
The Homebrew Numbers Book
Download the files and print your own copy. No book is shipped. OG and FG to ABV without the guesswork.
Brewing
Brew by the numbers.
Gravity, alcohol, bitterness, carbonation, and yeast health — the calculators here work across beer, wine, and cider so your readings translate into decisions instead of guesswork.
- tools
- 11
- guides
- 32
- always
- FREE
The workflow
One calculator for every step of brewing
01
ABV Calculator (Beer, Wine & Cider)
Estimate alcohol by volume from original and final gravity for beer, wine, and cider. Works with specific gravity or Brix, with attenuation and calories.
02
Brix to Specific Gravity & ABV Converter
Convert Brix to specific gravity (and back), read °Plato, and estimate potential ABV. A quick refractometer-to-hydrometer converter for brewers and winemakers.
03
Specific Gravity & OG/FG Calculator
Enter original and final gravity to get ABV, apparent and real attenuation, gravity points, °Plato, real extract, and calories.
04
Beer IBU Calculator & Chart
Estimate beer bitterness in IBU from your hop schedule using the Tinseth formula, with BU:GU balance and a style IBU chart.
05
Yeast Starter & Pitch Rate Calculator
Work out how much yeast to pitch from batch size, gravity, and beer type — target cell count, liquid packs, and dry yeast grams.
06
Hydrometer Temperature Correction Calculator
Correct hydrometer readings for temperature — enter your measured SG, sample temperature, and calibration temp to get the true specific gravity.
07
Beer Carbonation & Priming Sugar Calculator
Calculate how much priming sugar to add for bottle conditioning — supports corn sugar, table sugar, DME, and honey with target CO₂ volumes.
08
Brewing Water Chemistry Calculator
Build your water profile from source minerals and brewing salts — gypsum, calcium chloride, Epsom salt, and more. See SO₄:Cl ratio and style match.
09
Beer Recipe Calculator & Builder
Estimate OG, FG, ABV, and SRM from your grain bill, efficiency, and yeast attenuation. Plan recipes with 14 common grain types.
10
Extract Brewing OG Calculator
Estimate original gravity and potential ABV for an extract batch from your DME, LME, steeping grains, and batch volume.
11
Strike Water Calculator
Strike water temperature and volume for an all-grain mash from grain weight, water-to-grain ratio, grain temperature, and target mash temperature.
Learn
Brewing guides
- Beer recipes: lager, ale, IPA & extract
- Brewing equipment & supplies
- How to rehydrate & activate yeast
- Brewing: general FAQ & reference
- Yeast strain chart: beer, wine, mead & cider
- Lalvin EC-1118
- Lalvin 71B
- Fermentis US-05
- Active Dry vs Instant vs Rapid Rise Yeast
- Beer Carbonation and Priming Sugar Calculator: Get the Right Fizz
- Beer Cheese Recipe: How to Make It from Scratch
- Beer Gardens: History, Culture, and How to Build One
- Beer Tasting Scorecards & Sheets
- Best Homebrew Kits: A Buyer's Guide for Every Level
- How to Pour a Black and Tan (Step-by-Step)
- Brewing Water Chemistry Calculator: Adjust Your Water for Better Beer
- Cabernet Wine Fermentation: Process and Timing
- Apple Juice vs Apple Cider: Differences & Substitutes
- Coffee Wine: How to Brew It at Home
- Cold Crashing Beer & Wine
- German Brewing & Beer Culture
- Alcoholic Ginger Beer Recipe
- Herbal & Medicinal Beers
- Home Beer Fermentation: A Complete Guide
- Home Brewing: Kegging Beer
- How to Make Sake at Home
- Non-Alcoholic Beer: How to Brew It at Home
- Pineapple Beer & Quash Beer
- Red Wine Making Guide — From Grape to Glass
- Sauvignon Blanc Wine: Fermentation and Winemaking Guide
- Sour Beer and Tart Beer: Styles, Brewing, and Fermentation
- Yeast Farming & Slanting
FAQ
Common brewing questions
How do you calculate ABV for beer, wine, or cider?
The standard estimate is (OG − FG) × 131.25 using specific gravity. It works for all three because each ferments from a sugar solution — only the typical gravity range differs. The ABV calculator handles the maths and reports attenuation too.
Is Brix the same as specific gravity?
No — Brix measures dissolved sugar by weight and specific gravity measures density, but they convert cleanly before fermentation. Use the Brix converter to turn a refractometer reading into the gravity your recipe expects.
What gravity should my brew start at?
Beer and cider usually start around 1.045–1.070 and finish 4–8% ABV. Wine starts higher, often 1.080–1.110, finishing 11–14%. Check your reading against the reference table on each calculator.
Do beer, wine, and cider use the same tools?
Largely yes — gravity, ABV, and yeast-health tools are shared across all grain, fruit, and honey brewing. Mead has its own dedicated calculators, but the gravity and ABV maths are identical.