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 (sometimes called a “DWI”) for driving with a blood alcohol concentration (BAC) of .08% or more. But everyone absorbs and metabolizes alcohol at different rates, so estimating a person’s BAC is difficult. 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


(Also, check out our BAC chart.)


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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