Wellness estimates

BAC Calculator

Estimate your Blood Alcohol Content (BAC) based on drinks consumed, body weight, sex, and time elapsed. Use this Health estimates tool to enter your numbers, review the result, and understand the key assumptions before making the next decision.

What you get
A focused calculator, clear explanation, common questions, and useful next tools.
Quick intro
Calculator
Result
Explanation
Common questions
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How this calculator works
The result depends on the numbers you enter and the assumptions shown below.

BAC is calculated using the Widmark formula: BAC = (drinks × 14g alcohol) / (weight × r) − (0.015 × hours). One standard drink = 14g of pure alcohol. Legal limit is 0.08% in most US states.

Review the inputs carefully and treat the output as an estimate. For decisions involving money, taxes, health, law, or security, compare the result with trusted professional guidance when needed.

Frequently asked questions

How long does it take to sober up?

BAC drops at about 0.015% per hour. At 0.08% BAC, it takes about 5–6 hours to reach zero. Only time reduces BAC — coffee, water, and food do not speed it up.