⚠️ EDUCATIONAL TOOL ONLY: This BAC calculator provides estimates only. Results should NEVER be used to determine fitness to drive or make safety decisions. Always use designated drivers or alternative transportation after consuming any amount of alcohol.
🔬 Educational Purpose Only

Blood Alcohol Concentration (BAC) Calculator

Estimate your blood alcohol content based on drinks consumed, body weight, gender, and time elapsed. This educational tool helps promote alcohol awareness and responsible drinking decisions.

0.08% Legal Limit (US)
0.05% Many Countries
0.00% Safest for Driving

BAC Calculator

Modify the values and click the calculate button to use

hours
minutes
Beer
Wine
Liquor
Other

Your BAC Result

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Blood Alcohol Content (%)
Enter your details to calculate BAC

⚠️ Important Safety Notice

This calculator is for educational purposes only. Results are estimates and should never be used to determine fitness to drive. If you've been drinking, use alternative transportation.

Effects by Blood Alcohol Concentration

The degree of impairment caused by alcohol intoxication varies based on BAC. Impairments range from subtle effects to serious health risks.

BAC (%)
Behavior
Impairment
0.001–0.029
Average individual appears normal
Subtle effects that can be detected with special tests
0.030–0.059
Mild euphoria, relaxation, joyousness, talkativeness, decreased inhibition
Concentration
0.060–0.099
Blunted feelings, reduced sensitivity to pain, euphoria, disinhibition, extraversion
Reasoning, depth perception, peripheral vision, glare recovery
0.100–0.199
Over-expression, boisterousness, possibility of nausea and vomiting
Reflexes, reaction time, gross motor control, staggering, slurred speech
0.200–0.299
Nausea, vomiting, emotional swings, anger or sadness, partial loss of understanding
Severe motor impairment, loss of consciousness, memory blackout
0.300–0.399
Stupor, central nervous system depression, loss of understanding
Bladder function, breathing, dysequilibrium, heart rate
0.400–0.500
Severe central nervous system depression, coma, possibility of death
Breathing, heart rate, positional alcohol nystagmus
>0.50
High possibility of death
Life-threatening

Frequently Asked Questions

Common questions about blood alcohol content, its calculation, and effects on the body.

How accurate are BAC calculators?

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BAC calculators provide estimates only and can vary significantly from actual blood alcohol content. Factors like food consumption, medication, health conditions, and individual metabolism affect accuracy. Only professional breathalyzers or blood tests provide accurate results. Never rely on calculators for legal or safety decisions.

What factors affect blood alcohol content?

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Multiple factors affect BAC including: amount and type of alcohol consumed, body weight and composition, gender, time elapsed, food consumption, medications, health conditions, age, and individual metabolism. Women typically have higher BAC than men from the same amount of alcohol due to differences in body composition.

When is it safe to drive after drinking?

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The only safe approach is to never drive after drinking any amount of alcohol. Even small amounts can impair judgment and reaction time. If you've been drinking, use designated drivers, rideshare services, public transportation, or wait until completely sober. Legal limits vary by location but impairment begins at any level.

How long does alcohol stay in your system?

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On average, the body eliminates alcohol at approximately 0.015 BAC per hour (about one standard drink per hour). However, this varies significantly between individuals. Factors affecting elimination include metabolism, liver function, hydration, and overall health. Complete elimination can take much longer than people expect.

What is considered a standard drink?

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A standard drink contains approximately 14 grams of pure alcohol: 12 oz beer (5% alcohol), 5 oz wine (12% alcohol), or 1.5 oz distilled spirits (40% alcohol). Many drinks contain more alcohol than one standard drink, so it's important to check alcohol content and serving sizes.

Can I use this calculator to determine if I can drive?

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Absolutely not. This calculator is for educational purposes only and should never be used to determine fitness to drive. Even if calculations suggest you're under legal limits, any alcohol consumption can impair driving ability. Always use alternative transportation after drinking.