mg/dL to BAC Converter – mg/dL to % and ‰
Laboratories sometimes report blood alcohol in milligrams per deciliter (mg/dL). This page helps map those numbers to everyday BAC units.
Convert between BAC units
Enter a value in one unit to see approximate equivalents in other common BAC units. All conversions are approximate.
All conversions are approximate and rounded for readability.
Units and relationships shown here are simplified and intended for education, not for forensic or legal calculations.
Understanding mg/dL for BAC
A deciliter is one-tenth of a liter. When a lab reports blood alcohol in mg/dL, it is describing how many milligrams of alcohol are present in each deciliter of blood. For everyday understanding and legal contexts, these values are often converted into % BAC or promille.
Need to convert other units? We also offer a Promille to BAC Converter and a full BAC Unit Conversion Calculator for multi-unit comparisons.