What a BAC calculator over time can show
This tool applies the site's educational Widmark-style model to the standard drinks you enter, then displays the current estimated range and the same model at future hourly points. It is useful for seeing how the model's arithmetic changes when elapsed time changes.
What it cannot tell you
It cannot measure BAC, predict a personal sober time, confirm a legal limit, or decide whether you can drive. Food, drink timing, absorption, medication, health, body composition, and individual metabolism can all make a real result different from the model. Only a properly administered breath or blood test can measure BAC.
Start with the right input
If you know a beer, wine, spirit, or container label, first use the standard drinks calculator or standard drinks per container calculator. If you want to add individual drink details directly, use the main BAC Calculator. To understand the formula and its limits, read the methodology; for a plain-language explanation, read what BAC means.