Laboratories sometimes report blood alcohol in milligrams per deciliter (mg/dL). This page helps map those numbers to everyday 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.
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.