Use this tool to estimate your Blood Alcohol Content (BAC) based on the number of drinks consumed, your body weight, biological sex, and time elapsed since drinking began.

👤 Your Information

Your current body weight
Affects alcohol metabolism rate

🍺 Drinks Consumed

Drink #1

⏰ Time Information

Example: 2.5 hours ago

📚 Understanding BAC

BAC Levels & Effects

  • 0.00-0.02%: Slight mood elevation, relaxation
  • 0.02-0.05%: Feeling of warmth, minor impairment
  • 0.05-0.08%: Reduced coordination, impaired judgment
  • 0.08%+: LEGALLY IMPAIRED - Do not drive!
  • 0.10%+: Significant impairment, slurred speech
  • 0.15%+: Major impairment, risk of blackout
  • 0.30%+: Potential loss of consciousness, medical emergency

What is a "Standard Drink"?

  • 12 oz beer (5% ABV) = 1 drink
  • 5 oz wine (12% ABV) = 1 drink
  • 1.5 oz spirits (40% ABV) = 1 drink
  • Each contains approximately 0.6 oz of pure alcohol

Important Safety Notes

  • Alcohol affects everyone differently
  • Food, medications, and fatigue impact BAC
  • Your liver metabolizes about 1 drink per hour
  • There's no safe amount of alcohol to drink before driving
  • When in doubt, don't drive
🚨 Safety First: This calculator is for educational purposes only. Always arrange for a designated driver, use public transportation, or call a rideshare service. Your safety and the safety of others is paramount.

Frequently Asked Questions

How accurate is this BAC calculator?

This calculator provides estimates based on the Widmark formula, which is widely used but has limitations. Actual BAC can vary significantly based on individual factors like metabolism, food intake, medications, body composition, and more. This tool is for educational purposes only and should never be used to determine fitness to drive.

What BAC level is considered legally drunk?

In the United States, 0.08% BAC is the legal limit for driving in all states. However, impairment begins at much lower levels, and some states have lower limits for commercial drivers (0.04%) and zero tolerance for drivers under 21. Many countries have different legal limits, often 0.05% or lower.

How long does it take for alcohol to leave my system?

On average, the liver metabolizes approximately one standard drink per hour. However, this rate varies significantly between individuals based on factors like body weight, biological sex, liver health, and genetics. There's no way to speed up this process - only time will reduce BAC.

Why does biological sex affect BAC calculations?

Biological sex affects BAC because women typically have lower water content in their bodies compared to men of the same weight (about 52% vs 68%). Since alcohol distributes itself in body water, women generally achieve higher BAC levels than men when consuming the same amount of alcohol.

Can I drink coffee or take a cold shower to sober up faster?

No. Only time reduces BAC. Coffee, cold showers, exercise, or other home remedies may make you feel more alert, but they don't eliminate alcohol from your system or reduce your BAC. The only way to sober up is to wait for your liver to process the alcohol at its natural rate.

Is it safe to drive if my BAC is below the legal limit?

No. Impairment begins at BAC levels well below 0.08%. Studies show that reaction time, judgment, and coordination are affected even at 0.02% BAC. The safest choice is to never drive after drinking any amount of alcohol. Always use a designated driver, rideshare, or public transportation.