BAC Calculator Over Time: Educational Timeline Estimate

EDUCATIONAL BAC TOOL
See how a Widmark-style BAC estimate changes across future hours from standard drinks, body weight, and elapsed time. This is a model illustration, not a personal measurement or a countdown to driving.
There is no online calculation that can tell you when you are safe or legal to drive.
The model uses a fixed metabolism assumption. Actual BAC can differ substantially.
Plan a sober ride before drinking. Online estimates cannot measure impairment.
The estimate uses total pure alcohol, weight, sex used in the formula, and elapsed time. It applies the same fixed hourly assumption to every future row, which is why it cannot account for individual absorption, food, medication, health, or metabolism.
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.
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.
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.
Last reviewed: July 22, 2026 · Read our editorial policy.
Alcohol information tools for informed choices. Educational only.