Beer
Calculators for home brewers and beer enthusiasts, covering safety estimates and recipe math.
BAC Calculator (Blood Alcohol Concentration)
Estimate your Blood Alcohol Concentration (BAC) using the Widmark formula. Enter your sex, weight, drinks consumed, and time elapsed to get an instant estimate — for informational reference only. Never use this to judge fitness to drive.
Homebrew Gravity & ABV Calculator
Calculate estimated ABV from Original Gravity (OG) and Final Gravity (FG) using the standard homebrewing formula. Includes a dilution calculator to hit your target alcohol percentage. All calculations run in your browser — no login, no uploads.
Hydrometer Temperature Correction Calculator
Correct your hydrometer reading for sample temperature. Enter your measured gravity, the actual sample temperature, and your hydrometer's calibration temperature to get an accurate specific gravity. Supports 59°F (15°C) and 68°F (20°C) calibration presets. All calculations run in your browser — no login, no uploads.
Standard Drinks / Alcohol Units Calculator
Convert any drink's volume and ABV into standard drinks (US, UK, AU/SG, Canada) and pure alcohol grams. See how many units your drink contains according to your country's health guidelines — for reference only. All calculations run in your browser.