1
Enter Personal Information
Select your gender and enter your body weight. Choose the appropriate unit (pounds, kilograms, or grams).
blood alcohol percentage calculator
Blood alcohol calculator - Enter drink type, time, and gender to estimate your BAC level and sober-up time. Free safety tool for responsible drinking!
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Important Disclaimer
This calculator provides estimates only and should not be used to determine if you are safe to drive or operate machinery. Many factors affect blood alcohol content including food consumption, medications, and individual metabolism. Always err on the side of caution.
Current Blood Alcohol Content
0.000%
Time Until Sober
0 hours
BAC Elimination Chart
Guide & table of contents
Key Features
📊Interactive BAC Chart
Real-time visualization of blood alcohol content decline over time with smooth curves and hourly markers
⚖️Widmark Formula Calculation
Scientifically accurate BAC calculation using the proven Widmark formula with gender-specific coefficients
🍺Multiple Beverage Support
Calculate BAC for beer, wine, liquor, and custom beverages with various serving sizes and alcohol percentages
How to use blood alcohol percentage calculator
2
Set Time Since First Drink
Specify how much time has passed since you started drinking. Enter hours and minutes accurately for precise calculations.
3
Add Alcohol Consumption
Enter the amount and type of alcoholic beverages consumed. Choose from beer, wine, liquor, or specify custom drinks with alcohol content.
4
View Results and Chart
Click Calculate to see your current BAC, estimated time to reach 0%, and an interactive chart showing alcohol elimination over time.
FAQs about blood alcohol percentage calculator
Why should you use the Blood Alcohol Percentage Calculator?
It’s impossible to intuitively know how your blood alcohol concentration changes over time or when it will return to zero. The Blood Alcohol Percentage Calculator provides an easy-to-understand curve showing alcohol levels in your body over time and estimates when your blood alcohol concentration will reach zero, helping you make informed and safer decisions.
How accurate is this BAC calculator?
This calculator uses the scientifically proven Widmark formula and provides estimates based on average elimination rates. However, individual factors like food consumption, medications, and metabolism can affect actual BAC levels. This tool should not be used to determine if you're safe to drive.
What does the chart show?
The interactive chart displays your BAC decline over time as a smooth curve. It shows hourly markers with exact BAC values, the legal limit line (0.08%), and your current position. The chart helps visualize when you might reach 0% BAC.
Why do I need to enter gender and weight?
Gender and body weight significantly affect BAC calculations. Men and women have different body water distribution ratios, and heavier individuals typically have lower BAC levels for the same amount of alcohol consumed. These factors are essential for accurate Widmark formula calculations.
Can I use this to determine if I'm safe to drive?
No, absolutely not. This calculator provides estimates only and should never be used to determine if you're safe to drive or operate machinery. Many factors affect BAC that aren't included in calculations. Always use designated drivers, rideshare, or public transportation when drinking.
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