BAC Calculator

Calculate your estimated Blood Alcohol Concentration (BAC) based on drinks consumed, body weight, gender, and time elapsed. Understand impairment levels and time to sobriety.

Estimated BAC

Blood Alcohol

0.038%

Mild

Legal but impaired (under 0.08)

Hours to Sober~2.5 hrs
Drinks Processed1.0 of 2

This is an estimate only. Actual BAC varies. Never drink and drive.

Estimated BAC

Blood Alcohol

0.038%

Mild

Legal but impaired (under 0.08)

Hours to Sober~2.5 hrs
Drinks Processed1.0 of 2

This is an estimate only. Actual BAC varies. Never drink and drive.

Drinks Consumed

2 drinks
1 drinks15 drinks
1 hrs
0 hrs12 hrs

Your Information

lbs

Women typically have higher BAC due to body composition differences.

Effects at Your BAC Level

Mild(0.038% BAC)
  • •Lowered inhibitions
  • •Mild euphoria
  • •Slight impairment of judgment
  • •Decreased alertness

BAC Impairment Levels

0.00%Sober
0.02-0.05%Mild Impairment
0.05-0.08%Impaired
0.08%+Legally Drunk (US)
0.15%+Severe Impairment
0.30%+Life Threatening

What is a Standard Drink?

One standard drink contains approximately 0.6 oz (14g) of pure alcohol:

Beer

12 oz

5% ABV

Wine

5 oz

12% ABV

Liquor

1.5 oz

40% ABV

Malt Liquor

8 oz

7% ABV

Important Safety Information

  • • This calculator provides estimates only. Actual BAC varies significantly between individuals.
  • • Never drive after drinking. Use a designated driver, taxi, or rideshare.
  • • Alcohol affects judgment before you feel drunk. Don't rely on how you feel.
  • • If someone shows signs of alcohol poisoning (confusion, vomiting, seizures, slow breathing), call 911 immediately.

Quick Answer

BAC (Blood Alcohol Content) is estimated using the Widmark formula: BAC = (Alcohol consumed in grams / (Body weight × r)) - (Time × 0.015), where r is 0.68 for men, 0.55 for women. The legal limit for driving in most US states is 0.08%. This calculator provides estimates only - actual BAC varies by many factors. Calculate at practicalwebtools.com.

Key Facts

  • Legal driving limit in US: 0.08% BAC (lower in some states)
  • Body processes approximately 0.015% BAC per hour
  • BAC affected by: weight, gender, food, metabolism, drink strength
  • Standard drink: 12oz beer, 5oz wine, 1.5oz spirits
  • 0.02-0.03%: mild relaxation; 0.08%: impaired driving; 0.30%+: dangerous
  • Women typically reach higher BAC than men at same consumption
  • Food slows alcohol absorption but does not prevent intoxication

Frequently Asked Questions

BAC measures the percentage of alcohol in your bloodstream. A BAC of 0.08% means 0.08 grams of alcohol per 100 milliliters of blood. This is the legal limit for driving in most US states.
This calculator uses the Widmark formula, which provides estimates based on average alcohol metabolism. Actual BAC varies based on food intake, medications, liver health, and individual metabolism. This is for educational purposes only.
The body metabolizes alcohol at about 0.015% BAC per hour (roughly one standard drink). A person with 0.08% BAC would take about 5-6 hours to become sober. Sleep, coffee, and cold showers do NOT speed up this process.
Key factors include: body weight (higher weight = lower BAC), gender (women typically have higher BAC per drink), food intake (food slows absorption), drinking speed, and individual metabolism.
Even below 0.08%, alcohol impairs judgment, reaction time, and coordination. Some states have lower limits (0.05%), and commercial drivers often have 0.04% limits. When in doubt, don't drive.

Medical Disclaimer

This calculator is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider before making any health-related decisions.