Brewing calculators
IBU, ABV, mash temperature, dilution math for home brewers.
All brewing tools
19 tools, each runs locally in your browser. Click any card to open it.
ABV Calculator (Brewing) takes volume, gravity, hop bill, fermentation profile and returns the matching abv calculator…
Typical: 3-6 L/hr. Indoor kettles less. Wide outdoor more.
A Brewhouse Efficiency Calculator computes brewhouse efficiency from the inputs you provide.
Carbonation Calculator (Brewing) takes volume, gravity, hop bill, fermentation profile and returns the matching carbon…
Cider ABV Calculator takes volume, gravity, hop bill, fermentation profile and returns the matching cider abv result. …
Dry Hop Calculator (Brewing) takes volume, gravity, hop bill, fermentation profile and returns the matching dry hop ca…
fd vs rd, fd or rd, fixed deposit vs recurring deposit, india deposit comparison, rd vs fd interest fixed deposit vs r…
Force Carbonation Calculator takes mass, velocity, force, field strength and returns the matching force carbonation re…
Hop Utilization Calculator (Tinseth) takes volume, gravity, hop bill, fermentation profile and returns the matching ho…
IBU Calculator (Brewing) takes volume, gravity, hop bill, fermentation profile and returns the matching ibu calculator…
Mash pH Calculator (Brewing) takes volume, gravity, hop bill, fermentation profile and returns the matching mash ph ca…
Mead ABV Calculator takes volume, gravity, hop bill, fermentation profile and returns the matching mead abv result. Ru…
Net Worth Calculator computes net worth, breakdown by class from assets by class, liabilities by type. Runs entirely i…
RRSP Contribution Room Calculator computes pre tax balance and refund generated from salary, contribution, marginal ra…
Sparge Water Calculator (Brewing) takes volume, gravity, hop bill, fermentation profile and returns the matching sparg…
SRM Color Calculator (Brewing) takes volume, gravity, hop bill, fermentation profile and returns the matching srm colo…
Strike Water Calculator (Brewing) takes volume, gravity, hop bill, fermentation profile and returns the matching strik…
Wine ABV Calculator takes volume, gravity, hop bill, fermentation profile and returns the matching wine abv result. Ru…
Yeast Pitch Rate Calculator (Brewing) takes volume, gravity, hop bill, fermentation profile and returns the matching y…
About brewing
Brewing calculators cover the math homebrewers run for every batch: ABV from OG and FG (basic vs Daniels formula), IBU using Tinseth, Rager, or Garetz, SRM color from MCU + Morey, mash temperature for a target enzyme activity, strike-water temperature, hop utilization by boil time and gravity, priming sugar for any target carbonation level, water profile adjustment by mineral additions, and brewhouse efficiency.
Use these tools when planning a new recipe at a target ABV and IBU, dialing in mash temperature for a drier vs fuller body, computing strike water at 11 gallons mash water and 152°F target rest, balancing hop bitterness for a 6.5% IPA, picking priming sugar for a German wheat (high CO2) vs an English bitter (low CO2), or adjusting your water to match a Burton-on-Trent IPA profile.
Sources: Palmer's How to Brew, John Daniels' Designing Great Beers, Tinseth IBU paper, Briess and Weyermann maltster spec sheets. Defaults to homebrew scale (5 US gallons); toggle to metric or commercial batch sizes.
Common use cases
Real scenarios where the brewing calculators in this category earn their keep.
ABV from gravity
ABV ≈ (OG - FG) × 131.25 (basic) or the Daniels equation for higher-gravity beers (above 1.060). The ABV tool runs both for your specific gravities.
IBU from hop additions
Tinseth utilization formula given boil gravity, boil time, and hop AA%. Aggregate the IBU contribution of multiple additions for the recipe total.
Strike water temperature
Strike temp = (0.2/r) × (target - grain temp) + target, where r = water-to-grain ratio. The mash tool computes strike for your target rest.
Priming sugar by style
British ales 1.5-2.0 volumes CO2; American ales 2.2-2.6; wheat 3.0-4.0. The priming calculator outputs corn-sugar, table-sugar, or DME grams for your batch size and style.
Water profile to match a style
Target chloride:sulfate ratio (1:1 balanced, 2:1 malty, 1:3 hoppy). Add gypsum, calcium chloride, or epsom salt in grams to hit the profile.
Key terms
Glossary for the formulas and conventions these tools use.
- OG / FG
- Original Gravity / Final Gravity. Specific gravity of the wort before fermentation and beer after. Difference drives ABV.
- ABV
- Alcohol By Volume. ≈ (OG - FG) × 131.25 for typical beers. Higher-gravity needs Daniels or Cutaia formulas.
- IBU
- International Bittering Unit. Milligrams of isomerised alpha acid per liter. 5 IBU = light lager floor, 20-30 amber ale, 50-80 IPA, 80+ DIPA.
- SRM
- Standard Reference Method. Beer color scale. SRM 2-4 pale, 6-12 amber, 18-30 brown, 40+ stout/porter.
- Mash efficiency
- Percentage of grain potential sugar extracted into the wort. 70-75% is typical homebrew; commercial breweries hit 80-90%.
- Tinseth
- Glenn Tinseth's 1995 IBU utilization formula, the homebrew standard. More accurate than Rager for typical homebrew boil sizes.
- Burton water
- High-sulfate water profile from Burton-on-Trent, England. Emphasises hop bitterness. ~270 ppm sulfate, ~50 ppm chloride.
Frequently asked questions
Short answers to the most common brewing questions.