Brewing Calculators: IBU, Water Chemistry & Carbonation

IBU (Tinseth), ABV, water chemistry & carbonation — live results, no signup

Tip: Each calculator lets you share your result via link.

All free homebrew calculators for your brew day — pick your entry point: IBU (Tinseth), ABV, water chemistry and carbonation. Enter your values — results update live. Use alongside our free AI recipe generator or for your own recipe planning.

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IBU Calculator
Calculate your beer's bitterness using the Tinseth formula
SRM/EBC Calculator
Calculate your beer's color using the Morey formula
ABV Calculator
Calculate alcohol content from OG and FG
OG Calculator
Calculate original gravity from your grain bill
BU:GU Calculator
Calculate bitterness to gravity ratio for balance
Carbonation Calculator
Calculate priming sugar for bottle conditioning
Refractometer Calculator
Correct refractometer readings during fermentation
Dilution Calculator
Calculate water addition or boil-off for target gravity
Yeast Starter Calculator
Calculate pitch rate, starter volume and DME amount
Mash pH Calculator
Estimate mash pH from grain bill and water chemistry
Brewing Water Calculator
Beer water profile & salts for mash & sparge (gypsum, CaCl₂, match score)
Hop Substitution Calculator
Find the right substitute for any hop variety

About Our Brewing Calculators

Our free brewing calculators help you brew perfect beers. From calculating bitterness (IBU) to beer color (EBC/SRM) to carbonation — all important calculations in one place. The calculators are based on proven formulas like Tinseth (IBU), Morey (color), and standardized brewery formulas. Each calculator explains the formula used and delivers instant results — free and without signup.

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Frequently Asked Questions

What is an IBU calculator?▼
An IBU calculator computes the International Bitterness Units of your beer based on hop amount, alpha acid percentage, boil time and original gravity. Our calculator uses the proven Tinseth formula which accounts for hop utilization. IBU values range from ~5 (light lager) to over 100 (Double IPA).
How do you calculate the alcohol content (ABV) of beer?▼
Alcohol by volume is calculated from the difference between original gravity (OG) and final gravity (FG). The most common formula is: ABV = (OG − FG) × 131.25. Measure the OG before fermentation and the FG after fermentation using a hydrometer or refractometer.
How much priming sugar do you need for carbonation?▼
The amount of priming sugar depends on the desired CO₂ level (in g/L or volumes) and temperature. A typical ale needs about 5–7 g of table sugar per liter of beer. Our carbonation calculator computes the exact amount for table sugar, corn sugar or Speise.
Why do refractometer readings need correction?▼
Refractometers measure the refractive index of the liquid. During fermentation, alcohol distorts the reading so the displayed Brix value is higher than the actual final gravity. Our refractometer calculator corrects this error and shows the true final gravity in Brix and Plato.