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DUI Calculator

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.

Number of Drinks


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. 

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