The BAC Calculator

EDUCATIONAL BAC EXPLORER

BAC chart.
See the model’s limits.

This educational chart repeats the site’s Widmark-style arithmetic across time. It is not a BAC test, a sober-time prediction, or a decision tool for driving or work.

Explore an example model

Why a BAC chart has uncertainty

Online estimates depend on reported drinks, label accuracy, timing, weight and a simplified formula. Food, absorption, metabolism, health, medication, body composition and drinking pattern can all make an actual measurement differ.

Sources and limits

  1. NHTSA: Drunk Driving
  2. The BAC Calculator methodology and formula limits

Last reviewed: July 24, 2026.