Know Your Limits. Stay Safe.

Free BAC calculator, alcohol metabolism tools, and responsible drinking resources. All calculations run in your browser — no data stored.

Quick BAC Estimate

Weight (lbs)

Gender

Standard Drinks

Hours Elapsed

⚠️ Educational Tool Only — Never Drink and Drive

This calculator is for educational purposes only and provides estimates based on averages. Actual BAC depends on many individual factors. Never rely on a calculator to determine if you are safe to drive. If in doubt, don't drive. Call a rideshare, taxi, or designated driver.

Estimated BAC

0.050%

Buzzed

Lowered inhibitions. Mild impairment of reasoning and memory.

Est. time to sober: ~3.3 hours

Full BAC Calculator →

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🧪Widmark Equation

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📱Works on Mobile

All Calculators

BAC & Impairment

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BAC Calculator

Estimate your blood alcohol content based on weight, gender, drinks consumed, and time elapsed. See impairment levels and when you may be sober.

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BAC Chart

Interactive BAC reference chart showing estimated BAC levels by body weight and number of drinks. Includes effects at each BAC level and legal limits.

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Metabolism Calculator

Estimate how long until your BAC reaches zero. Enter your estimated BAC or drinks consumed and see a projected BAC timeline.

Drink Tracking

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Alcohol Calculator

Enter what you drank and see total alcohol units, calories consumed, and estimated BAC. Track your intake with our free alcohol calculator.

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Standard Drink Calculator

Convert any alcoholic beverage to standard drink equivalents. Enter the volume and ABV% to see how many standard drinks it contains.

Brewing & ABV

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Beer ABV Calculator

Calculate ABV from original and final gravity readings for homebrewing. Compare alcohol content across popular beer styles.

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ABW/ABV Calculator

Convert between alcohol by weight (ABW) and alcohol by volume (ABV). Understand the difference and why it matters.

Event Planning

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Party Drink Calculator

Calculate how much beer, wine, and liquor to buy for your party. Enter guest count and duration to get a complete shopping list.

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Cocktail Calculator

Scale cocktail recipes up or down, calculate alcohol content per cocktail, and estimate BAC from cocktails consumed.