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BAC Calculator

Explore an educational BAC estimate, not a measurement. Never use it to decide whether to drive or operate equipment.

Guide

Interactive workspace

No account required

The estimate runs locally; no health-data upload is required. Optional analytics and advertising have separate consent and privacy disclosures. Avoid sensitive personal inputs.

Educational Widmark estimate only, not a measurement. Never use this result, including 0.000%, to decide whether to drive, operate equipment, or drink more. Absorption, food, medications, body composition, and elimination vary substantially. If drinking, do not drive; arrange a sober ride.

Educational BAC estimate (not measured)
0.026%
Pure alcohol in entered beverages
19.7 g

Uses ethanol density 0.789 g/mL and an assumed decline of 0.015 percentage points/hour from the start of drinking. This simplified model does not represent absorption or predict a safe time to drive. For mixed drinks, enter the equivalent total volume at one consistent ABV.

How to use it

  1. Enter adult weight, total beverage volume, and one consistent ABV.
  2. Set hours since drinking began and the stated distribution assumption.
  3. Read the educational estimate and limitations; arrange a sober ride rather than making driving decisions from a number.
What is BAC Calculator?

Explore an educational blood alcohol estimate and why a calculation cannot establish driving safety.

How it works

Convert beverage volume and ABV into grams of ethanol using 0.789 g/mL. Apply a simplified Widmark distribution factor and subtract an assumed 0.015 percentage points per hour, flooring the estimate at zero.

Common uses
  • Learn how drink volume and ABV relate to grams of alcohol.
  • Explore how distribution assumptions change an educational model.
  • Understand why estimated BAC is not evidence of driving fitness.
Limitations
  • Results depend on the browser, network, input, and external service involved.
  • This tool is informational and does not replace specialist diagnostics or professional advice.
Frequently asked questions
Can I drive if the calculator shows zero?
Do not use this calculator to decide whether to drive. A displayed zero is only a model output and cannot establish sobriety, safety, or compliance with a legal limit. If drinking, arrange a sober ride.
Why can estimated BAC differ from measured BAC?
Absorption, food, body composition, medications, drinking patterns, and individual elimination vary. The simplified model does not measure any of them.
Does this predict when I will be safe to drive?
No. It provides no safe-driving threshold, countdown, or clearance. The assumed elimination rate and distribution factor are educational simplifications.

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