Blood Alcohol Content (BAC) Calculator

Estimate your blood alcohol level. Remember: This is an estimate only. When in doubt, don't drive!

Gender

Body Weight

Drinks Consumed (0 total)

Beer (12 oz, 5%)

Wine (5 oz, 12%)

Shot (1.5 oz, 40%)

Cocktail (mixed)

Hours Since First Drink

⚠️ Disclaimer: This calculator provides estimates only. Many factors affect actual BAC. Never drive if you've been drinking. When in doubt, use a rideshare or designated driver.

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Features

Instant Calculation

Get your estimated BAC level immediately.

Science-Based

Uses Widmark formula for accurate estimates.

Sobering Time

Estimate how long until you're sober.

Stay Safe

Know your limits before driving.

Blood Alcohol Content (BAC) measures the amount of alcohol in your bloodstream. It's affected by factors like weight, gender, number of drinks, and time elapsed. Our calculator uses the Widmark formula to provide an estimate. Always prioritize safety - if you've been drinking, don't drive.

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?Frequently Asked Questions

How is BAC calculated?

BAC is calculated using the Widmark formula, which considers the amount of alcohol consumed, your body weight, gender (affecting water content), and time elapsed since drinking.

What BAC level is considered drunk?

In most places, 0.08% is the legal limit for driving. However, impairment begins at much lower levels. Even 0.02% can affect judgment and coordination.

How long does it take to sober up?

On average, the body metabolizes alcohol at about 0.015% per hour. The time to sober up depends on your current BAC level.

Is this calculator accurate?

This provides an estimate only. Actual BAC can vary based on many factors including food intake, medications, metabolism, and health conditions. Never rely solely on calculators - when in doubt, don't drive.