BAC Calculator: Estimate Your Blood Alcohol Concentration

Use the blood alcohol level calculator to estimate your blood alcohol concentration (BAC) for a given number of drinks.

In every state, you can get a DUI (also called a “DWI” and "OWI") for driving with a blood alcohol concentration (BAC) of .08% or more. For underage drivers (those under 21 years old), there are also "zero-tolerance" laws that impose stricter BAC limits (anywhere from .03% to any measurable amount).

But everyone absorbs and metabolizes alcohol at different rates, so estimating a person’s blood alcohol content is difficult. And because of how "driving under the influence" is defined, even if you don't have a BAC that's above the legal limit, you can still get a DUI if you are actually impaired by drugs or alcohol while driving.

The calculator below, however, can give you an approximation of what your BAC might be based on:

• your gender

• the number of drinks you’ve had

• the time you’ve been drinking, and

• your weight.

      or

      Number of Drinks

      (Also, check out our BAC chart.)

      Disclaimer

      The BAC calculator gives only estimates of blood alcohol concentration and doesn’t take into account all the factors that affect BAC. So you shouldn’t rely on these estimates. If you’ve been drinking, let someone else drive.

      DUI Laws by State

      Follow the links below to find out about the DUI laws in your state.

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