BAC Calculator

Calculate your blood alcohol concentration (BAC) using this easy to use tool. Quickly convert drinks to alcohol content, select hours since first drinking, and display time until sober and the legal limit to drive.

The formula was rigorously checked using Watson's formula for water concentration calculation in the body and was precisely tuned. Results tended to run higher than online calculators because of how it was tuned to ensure observations fall below estimations rather than above. The tool is only designed for educational purposes and true BAC levels must be measured in another way for accuracy. This calculator is not a means for determining sobriety.