The BAC Calculator

BAC UNIT TOOL

BAC conversion calculator.
Translate the notation.

Convert a BAC percentage into common concentration units. A conversion describes the same number in another format; it does not establish impairment, legal status, or whether to drive.

BAC CONVERSION CALCULATOR

Convert a BAC percentage into other units.

Enter a percentage

This is a mathematical conversion, not a test result.

THE RELATIONSHIP

Same amount.
Different notation.

A percentage BAC can be expressed in several equivalent concentration units. For example, 0.08% equals 0.08 g/dL, 80 mg/dL, 0.8 g/L, and 80 mg per 100 mL. The conversion changes notation only; it does not add a legal or medical interpretation.

Learn what BAC means
Understand BAC levels and limits
See an educational estimate over time

How BAC percentage conversion works

For the notation used here, the numeric percentage equals g/dL. To convert it, multiply by 1,000 for mg/dL, by 10 for g/L, or by 1,000 for mg per 100 mL. For example: 0.08% × 1,000 = 80 mg/dL.

When to use this calculator

Use this tool when a report, article, or educational resource uses a different BAC concentration unit and you need to compare notation. Do not use it to interpret a legal threshold, decide whether someone is impaired, or make a health decision. Limits and measurement practices vary by jurisdiction and circumstance.

A conversion is not a measurement. If you have been drinking, do not use any converted number as a reason to drive. Choose a sober ride instead.

Related BAC tools

Use the main BAC Calculator for an educational estimate from drinks and context, BAC Calculator Over Time for a future-hour model, and BAC Levels Explained for the meaning and limitations of a BAC number.

Sources and review

  1. NHTSA: BAC definition and alcohol effects
  2. The BAC Calculator: formula, assumptions, and limits

Last reviewed: July 23, 2026 · Read our editorial policy.