For the love of a good brew
Your equipment.
Your numbers.
A better brew day.
Free brewing calculators that work together. Set up your equipment once, and take the guesswork out of every batch.
- No account needed
- US & metric
- Saved on your device
A few good tools
What are you brewing today?
Know your beer
ABV Calculator
Two gravity readings. Find out how strong your beer really is.
Calculate ABVStart the mash
Strike Water Temperature
Find the water temperature that lands your mash on target.
Find your strike tempGet the balance
IBU Calculator
Plan your bitterness. Compare Tinseth and Rager side by side.
Calculate IBUFinish the batch
Priming Sugar
The right amount of sugar for the carbonation you want.
Calculate priming sugarMeet your brew day companion
One brew.
Every number.
From the first water in the kettle to the final gravity reading. Your plan, timers, and brew log, together on the sheet you keep open all day.
Plan your brew day Your equipment. The standard formulas. All connected.A simple pale ale
- Strike temperature
- 163°F73°C
- Strike water
- 4.4 gal16.6 L
- Expected OG
- 1.053Specific gravity
- Bitterness
- 25 IBUTinseth · 29 Rager
11 lb / 5 kg pale malt. Example recipe, calculated with the same engine as your tools.
- 01Set up your equipment
Save your batch size, efficiency, and losses.
- 02Make a plan. Start the timers.
Your water, gravity, and hops, worked out.
- 03Log it. Learn from it.
Keep your readings for the next batch.
A little brewing know-how
Better beer starts with “why?”
Better readings
How to use a hydrometer
Reading it right, where to read the meniscus, and what a misread actually costs.
Read the guideKnow your process
Mash temperature: what 148°F vs 156°F actually does
How mash conditions affect fermentability, with measured examples and their limits.
Read the guideSolve a problem
Stuck fermentation troubleshooting
Check an unexpected finish, investigate a stall, and resolve it before bottling.
Read the guideFirst batch? Start with a good gravity reading. The rest follows.
The full toolbox
A tool for every part of the brew.
34 calculators. The math shown.
Ready for your equipment, in your units.
Gravity & ABV
The numbers on every brew sheet.
- ABV CalculatorStandard and alternate formulas side by side — and why they disagree above 1.070.
- Hydrometer Temperature CorrectionCorrect a warm reading to what your hydrometer was calibrated for.
- Refractometer CorrectionBrix to gravity for wort — and the alcohol-corrected reading during fermentation.
- SG / Plato / Brix ConverterSpecific gravity, °Plato, °Brix and gravity points, converted both ways.
- Expected OGYour grain bill × your efficiency = the OG you should hit.
- AttenuationApparent and real attenuation from OG and FG.
- Beer Calories & CarbsCalories and carbohydrates per serving from OG and FG.
Mash & Water
Hit your temps and volumes on the first try.
- Strike Water TemperatureThe water temp that lands your mash exactly where you want it.
- Mash Infusion & Step MashHow much boiling water raises the mash to the next rest.
- Total WaterThe full ledger: strike → sparge → pre-boil → fermenter, from your losses.
- Sparge WaterSparge volume and temperature for batch, fly and no-sparge.
- Mash ThicknessQuarts per pound or liters per kilo — and what thickness changes.
- Boil-Off & DilutionMissed your OG? How much to boil longer, dilute, or add.
- Brewhouse EfficiencyEnter your actuals, get your real number — and save it to your profile.
Hops
Both formulas, so you know why recipes disagree.
Yeast & Fermentation
Pitch enough, ferment clean.
- Yeast Pitch RateCells you need for ale or lager at your gravity and volume.
- Yeast StarterStarter size and DME to grow the cells you are short.
- Blending & FortifyingMix two batches, or add a purchased spirit — the resulting ABV.
- Fermentation TemperatureThe heat your fermentation makes, the ice it takes to absorb it, and whether a swamp cooler works in your climate.
- Sanitizer DilutionStar 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 SugarCorn sugar, table sugar, DME or honey for your target CO₂ volumes.
- Keg CarbonationThe regulator PSI for your temperature and target volumes — altitude-corrected, in psi or bar.
- Beer Line LengthBalance your kegerator: line length for a foam-free pour, by tubing and pour speed.
- CO₂ Tank DurationHow many kegs a 5 lb or 6 kg cylinder carbonates, dispenses and purges — three separate uses.
- Spunding ValveThe valve pressure at your fermentation temperature and the gravity to close it at — headspace counted, vessel rating checked.
- Bottle CountBatch 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 & HoneyEstimate honey for a target gravity, alcohol, and the finish under stated tolerance assumptions.
- Cider ABV & SugarEstimate cider strength and sugar additions, with clearly labeled tolerance scenarios.
- Batch Cost per PintWhat your beer really costs per pint — ingredients, energy computed from your profile, gas, gear.
Recipe & Planning
Any recipe, your batch, your kit.
- Recipe ScalerScale any recipe to your batch size and efficiency — with the pre-boil volume your kettle really needs.
- Extract for a Target GravityHow much DME or LME for 1.050 in 5 gallons — and the all-grain equivalent.
- Yeast ViabilityLive 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.
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Math you can check.
Published formulas. Sources cited. Your numbers in the working.
Your brew, your units.
Gallons or liters. Fahrenheit or Celsius. Equally at home.
Yours, on your device.
No account. Your equipment and brew log stay in your browser.