Blood Alcohol Content (BAC) Calculator

Blood Alcohol Content (BAC) is the percentage of alcohol in your bloodstream. In the United States, a BAC of 0.08% or higher is considered legally intoxicated for drivers 21 and older. Use this calculator to estimate your BAC based on your gender, weight, drinks consumed, and time elapsed.

Note: This calculator provides estimates only and should not be used as a definitive measure of blood alcohol content. Many factors can affect BAC, including medications, food consumption, and individual metabolism.

Understanding BAC Levels

  • 0.02-0.03%: Slight mood changes, mild relaxation
  • 0.05%: Lowered alertness, impaired judgment
  • 0.08%: Legal intoxication limit - significant impairment
  • 0.10%: Clear deterioration of reaction time and control
  • 0.15%: Major impairment of mental and physical control

State-by-State BAC Limits

StateStandard Legal BAC %Zero Tolerance BAC %Enhanced Penalty BAC %
Alabama.08.02.15
Alaska.08.00.15
Arizona.08.00.15
Arkansas.08.02.15
California.08.01.15
Colorado.08.02.17
Connecticut.08.02.16
Delaware.08.02.15
District of Columbia.08.00.20
Florida.08.02.15
Georgia.08.02.15
Hawaii.08.02.15
Idaho.08.02.20
Illinois.08.00.16
Indiana.08.02.15
Iowa.08.02.15
Kansas.08.02.15
Kentucky.08.02.18
Louisiana.08.02.15
Maine.08.00.15
Maryland.08.02.15
Massachusetts.08.02.20
Michigan.08.02.17
Minnesota.08.00.16
Mississippi.08.02-
Missouri.08.02.15
Montana.08.02.16
Nebraska.08.02.15
Nevada.08.02.18
New Hampshire.08.02.18
New Jersey.08.01.10
New Mexico.08.02.16
New York.08.02.18
North Carolina.08.00.15
North Dakota.08.02.18
Ohio.08.02.17
Oklahoma.08.02.17
Oregon.08.00.15
Pennsylvania.08.02.10
Rhode Island.08.02.10
South Carolina.08.02.16
South Dakota.08.02.17
Tennessee.08.02.20
Texas.08.02.15
Utah.05.00.16
Vermont.08.02.16
Virginia.08.02.15
Washington.08.02.15
West Virginia.08.02.15
Wisconsin.08.00.17
Wyoming.08.02.15

Note: BAC limits are used to determine if a person can legally drive. The standard BAC limit sets a specific percentage above which a person can face charges while driving. Zero-tolerance laws apply to underage or non-legal drinkers. Enhanced penalty limits may apply for repeat offenders or high BAC levels.

Important Disclaimers

  • This calculator provides estimates only and should not be used as a legal reference.
  • Many factors can affect your actual BAC, including metabolism, medications, and food consumption.
  • The safest option is to not drink and drive at all.
  • If you plan to drink, always have a designated driver or use a ride-sharing service.