How to use this BAC calculator

Enter your weight and sex. Then add each drink you had: what it was, how big it was, how strong it was (the % on the label), and what time you finished it. The calculator shows your estimated BAC right now, when it will peak, and a graph of how it rises and falls over time.

You can add drinks as you go or enter them all afterward. Give each drink its own time (as close as you can remember). If you put them all at the same time, the estimate will be off.

Why our BAC calculator asks for size and strength

“One drink” can mean very different amounts of alcohol. A 12 oz beer at 10% has twice the alcohol of a 12 oz beer at 5%. And a heavy pour of wine has more than a light one. Entering size and strength gives a better estimate than just counting drinks.

For reference: one U.S. standard drink is about a 12 oz beer at 5% ABV, a 5 oz glass of wine at 12% ABV, or a 1.5 oz shot of 40% ABV. Our guide to standard drink sizes has more examples, and the standard drink calculator counts them for any drink.

Want to learn more? Read how a BAC calculator works, how much alcohol is in common drinks, or about this calculator for the details.