Different countries, devices, and reports use different BAC units. This calculator helps you move between them.
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.
Historically, different regions and disciplines adopted different ways to express concentration: percentages, parts per thousand, and mass per volume. While the units vary, they all aim to describe the same physical idea: how much alcohol is in a given amount of blood.