Estimated BAC Calculator
Use this calculator to estimate your blood alcohol concentration (BAC) and impairment level. It is for education only and should never be used to decide whether driving is safe.
What this calculator tells you
This page helps answer a common question: “How much alcohol will get you drunk?” The short answer is that there is no single number for everyone. A 140 lb person and a 220 lb person can drink the same amount and feel very different effects.
This calculator estimates BAC using a standard formula. It can help you understand risk, but it does not replace breath testing, medical advice, or legal guidance.
How BAC is estimated
The tool uses a version of the Widmark method, which estimates BAC from:
- Body weight
- Biological sex (as a body-water distribution factor)
- Number of standard drinks consumed
- Time since drinking started
Typical BAC ranges and effects
- 0.01–0.029: Mild mood changes, slight relaxation.
- 0.03–0.059: Reduced attention and judgment.
- 0.06–0.079: Noticeable coordination and reaction-time decline.
- 0.08–0.119: Legally intoxicated in many regions; driving risk is high.
- 0.12–0.199: Significant motor and cognitive impairment.
- 0.20+: Severe intoxication, blackout risk, and danger of alcohol poisoning.
What counts as one standard drink?
Many people underestimate intake because serving sizes vary. A “single drink” in a large glass can equal two or more standard drinks.
- 12 oz beer at 5% ABV
- 5 oz wine at 12% ABV
- 1.5 oz distilled spirits at 40% ABV
High-ABV beer, oversized wine pours, and strong cocktails can raise BAC faster than expected.
Why “how much gets you drunk” has no universal answer
1) Body size and composition
Alcohol distributes through body water. People with lower body water percentage often reach higher BAC from the same dose.
2) Drinking speed
If drinks are consumed quickly, BAC rises before the body can metabolize alcohol. Spacing drinks over time lowers peak BAC.
3) Food intake
Drinking on an empty stomach can increase absorption speed and make effects stronger and faster.
4) Medications and health status
Some medications and conditions can intensify alcohol effects or make combinations dangerous, even at moderate BAC levels.
5) Tolerance is not protection
People who “feel fine” may still have dangerous impairment. Subjective feeling is not a reliable safety measure.
How to use this calculator responsibly
- Use it for planning safer choices, not to maximize intoxication.
- Set a ride plan before drinking.
- Alternate alcoholic drinks with water.
- Eat before and during drinking.
- Stop early if coordination, speech, or judgment changes.
Frequently asked questions
How many drinks is “drunk”?
“Drunk” is not a strict medical cutoff, but many people show clear impairment before BAC reaches 0.08. For some, 2–3 drinks can be enough; for others it may take more. Context matters.
Can I speed up sobering?
No. Coffee, cold showers, and exercise may improve alertness but do not remove alcohol faster. Only time lowers BAC meaningfully.
Is this legal advice?
No. Laws vary by country and state. Commercial driving limits, zero-tolerance rules, and penalties differ by jurisdiction.
Bottom line
If your question is “how much alcohol will get me drunk,” the safest answer is: less than you think, and sooner than you expect. Use estimates as a warning tool, plan transportation in advance, and never drive after drinking.