Free, private, instant

Alcohol calculators that show their work.

Understand what is in a pour, compare measurements and explore an estimated BAC. Nothing to sign up for; your entries stay in your browser.

Alcohol units calculator

Calculate UK units from drink size and ABV.

Standard drink calculator

Convert any pour into U.S. standard drinks.

BAC estimator

Explore a cautious, formula-based BAC estimate.

A useful boundary

Estimates inform. They do not certify safety.

These calculators are educational. A BAC estimate is never a measurement and must never be used to decide whether to drive or do anything potentially dangerous.