Free brewing calculators — no app, no login

Set up your equipment once.
Every tool remembers it.

Enter your batch size, efficiency and losses one time. Strike temps, water volumes, expected OG, IBUs and ABV all come out right for your brewhouse — on the standard formulas, in US or metric, with the math shown.

Open Brew Day Browse all calculators

Tinseth, Palmer & Daniels formulas
Remembers your equipment
US & metric, no login

1

Set up your equipment

Batch size, efficiency, boil-off, losses. Two minutes, once, saved on your device.
2

Plan the brew day

Brew Day gives you strike temp, every water volume, expected OG and IBU.
3

Log what actually happened

Enter your readings, get efficiency and ABV — and your profile learns your real numbers.

The flagship

Brew Day: the sheet you keep open for five hours

One page built from every calculator on the site, driven by your profile. Plan it before mash-in, run the timers during the boil, log your readings at the end — and it tells you your real efficiency and ABV.

Strike volume and temperature, sparge volume, the full water ledger
Expected pre-boil gravity and OG from your grain bill and efficiency
IBUs by Tinseth and Rager, so you know why the recipe disagrees
Mash and boil timers with hop-addition alerts
Log actuals → brewhouse efficiency, ABV, attenuation — saved as your brew log

Open Brew Day →

Brew sheet · example 5.5 gal batch · 72% · batch sparge

Plan

Grain bill: 11 lb · 5 kg pale malt
Strike water: 4.4 gal · 16.6 L at 163°F · 73°C
Sparge water: 4.4 gal · 16.6 L
Pre-boil (hot): 7.5 gal · 28.4 L
Expected OG: 1.053
IBU: 25 Tinseth · 29 Rager

Log

Actual OG: 1.050 (-3 pts vs plan)
Efficiency: 68% save to profile?
FG: 1.011
Attenuation: 78% apparent
ABV: 5.1% standard · 5.2% alternate

Every number here is computed by the same engine the calculators use — Palmer's infusion equation, Tinseth's and Rager's utilization, points × efficiency. Nothing is typed in.

The toolbox

Every calculator, grouped the way you brew

Set your equipment once — every tool below reads it. Each one shows its formula and its source, and takes gallons or liters without asking.

Gravity & ABV

The numbers on every brew sheet.

ABV Calculator Standard and alternate formulas side by side — and why they disagree above 1.070. Hydrometer Temperature Correction Correct a warm reading to what your hydrometer was calibrated for. Refractometer Correction Brix to gravity for wort — and the alcohol-corrected reading during fermentation. SG / Plato / Brix Converter Specific gravity, °Plato, °Brix and gravity points, converted both ways. Expected OG Your grain bill × your efficiency = the OG you should hit. Attenuation Apparent and real attenuation from OG and FG. Beer Calories & Carbs Calories and carbohydrates per serving from OG and FG.

Mash & Water

Hit your temps and volumes on the first try.

Strike Water Temperature The water temp that lands your mash exactly where you want it. Mash Infusion & Step Mash How much boiling water raises the mash to the next rest. Total Water The full ledger: strike → sparge → pre-boil → fermenter, from your losses. Sparge Water Sparge volume and temperature for batch, fly and no-sparge. Mash Thickness Quarts per pound or liters per kilo — and what thickness changes. Boil-Off & Dilution Missed your OG? How much to boil longer, dilute, or add. Brewhouse Efficiency Enter your actuals, get your real number — and save it to your profile.

Hops

Both formulas, so you know why recipes disagree.

IBU Calculator Tinseth and Rager shown together, with whirlpool additions handled. Hop Substitution Different alpha acids than the recipe? Adjust the weight to match.

Yeast & Fermentation

Pitch enough, ferment clean.

Yeast Pitch Rate Cells you need for ale or lager at your gravity and volume. Yeast Starter Starter size and DME to grow the cells you are short. Blending & Fortifying Mix two batches, or add a purchased spirit — the resulting ABV. Fermentation Temperature The heat your fermentation makes, the ice it takes to absorb it, and whether a swamp cooler works in your climate. Sanitizer Dilution Star San, iodophor, bleach, PBW or OxiClean for the water you are mixing — label doses in spoons, mL or grams, and a check for a mix you already made.

Packaging

Carbonation, priming and pours that do not foam.

Priming Sugar Corn sugar, table sugar, DME or honey for your target CO₂ volumes. Keg Carbonation The regulator PSI for your temperature and target volumes — altitude-corrected, in psi or bar. Beer Line Length Balance your kegerator: line length for a foam-free pour, by tubing and pour speed. CO₂ Tank Duration How many kegs a 5 lb or 6 kg cylinder carbonates, dispenses and purges — three honest line items. Spunding Valve The valve pressure at your fermentation temperature and the gravity to close it at — headspace counted, vessel rating checked. Bottle Count Batch size to 12 oz, 500 mL or 750 mL bottles — after the losses your profile already knows about.

Mead, Cider & Cost

Same math, different sugar.

Mead ABV & Honey Honey for a target gravity, the ABV it makes — and where your yeast will actually stop. Cider ABV & Sugar Juice gravity to ABV, sugar to add for a target strength — and where your yeast will stop. Batch Cost per Pint What your beer really costs per pint — ingredients, energy computed from your profile, gas, gear.

Recipe & Planning

Any recipe, your batch, your kit.

Recipe Scaler Scale any recipe to your batch size and efficiency — with the pre-boil volume your kettle really needs. Extract for a Target Gravity How much DME or LME for 1.050 in 5 gallons — and the all-grain equivalent. Yeast Viability Live cells left in a liquid pack by its date, and what that does to your pitch. Beer Color (SRM & EBC) The color your grain bill makes on all three published formulas, a swatch from physics — and how much dark malt a target needs.

New to brewing?

Start with the three numbers that matter

You don't need every calculator on day one. Learn to read a hydrometer, know what OG and FG are telling you, and pick how you'll get beer into a glass. The rest follows.

Read a hydrometer The one instrument that never lies — once you correct for temperature.
Understand OG and FG Two readings, and everything from ABV to "is it done yet" falls out of them.
Bottle or keg? What each costs, how long each takes, and the calculators that make either foolproof.

Guides

The why behind the numbers

Short, honest guides that pair with the calculators — what each number means, how to move it, and what went wrong when it won't move.

How to use a hydrometer Reading it right, where to read the meniscus, and what a misread actually costs. Mash temperature: what 148°F vs 156°F actually does The measured effect on body and attenuation — and the blind tasting that complicates it. Stuck fermentation troubleshooting Is it really stuck? The causes in order, and the bottling risk nobody warns you about.

Math you can check

Every result comes from a published formula — Tinseth, Rager, Palmer, Daniels — cited on the page, with a “show the math” breakdown using your own numbers.

US and metric, equally

Liters, kilos and °C aren't a toggle we bolted on. Every tool takes either, remembers which you use, and formats results the way you'd say them.

Private by design

No accounts, no tracking dashboards. Your equipment profile and brew log live in your browser and nowhere else.

Honest recommendations

When a result suggests gear, it's the piece the numbers justify — and we say so when the cheap option wins. Some links earn a commission; that never changes the math.

Set up your equipment once.Every tool remembers it.