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Blood Alcohol Calculator

Calculated in your browser — we never store your dataPeer-reviewed formulas (Mifflin-St Jeor, WHO)
NEVER Drink and Drive

This calculator provides rough estimates only and should NEVER be used to determine if you are safe to drive. BAC is affected by many factors not accounted for here including medications, food intake, health conditions, and individual metabolism. If you have consumed any alcohol, do not drive. Use a rideshare, taxi, or designated driver.

Affects metabolism rate (Widmark factor)

1 standard drink = 12 oz beer, 5 oz wine, or 1.5 oz spirits
Status: Impaired
Calculation Result
Estimated BAC: 0.050%
Legal limit: 0.08% in most US states
Estimated hours until sober: 3.3 hours
Below the legal driving limit
BAC Effects Guide
Minimal effects0.00 - 0.02%

Relaxation, slight mood changes

Mild impairment0.02 - 0.05%

Lowered inhibition, slight euphoria

Increased impairment0.05 - 0.08%

Reduced coordination, impaired judgment

Legally intoxicated0.08 - 0.15%

Poor muscle control, blurred vision, vomiting

Severe impairment0.15 - 0.30%

Loss of balance, potential blackout

Life-threatening0.30%+

Loss of consciousness, risk of death

What is a Standard Drink?
Beer
12 oz at 5% ABV
Wine
5 oz at 12% ABV
Spirits
1.5 oz at 40% ABV

Each contains approximately 14 grams of pure alcohol.

This is an ESTIMATE only. Do NOT use this to decide whether to drive. If you have consumed any alcohol, arrange a safe ride home.