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Blood Alcohol Content (BAC) Calculator
Estimate blood alcohol level using the Widmark formula. For educational purposes only — never use to determine fitness to drive.
⚠️ Estimated BAC above 0.08% — Do NOT drive. Call a rideshare.
1 drink = 12oz beer, 5oz wine, or 1.5oz spirits
BAC Estimate
1.818%
Estimated Blood Alcohol Content
Severely Impaired
Level
121.2h
Hours to Sober
0.080%
Legal Limit (US)
🚫 Do Not Drive
Status
Estimated BAC: 1.818% — Severely Impaired. Your body metabolizes ~0.015% per hour. You'll be sober in ~121.2 hours.
Analysis & insights
Your estimated BAC is 1.818%, which would take approximately 121.2 hours to return to zero at the average elimination rate of 0.015%/hour. This is above the US legal driving limit of 0.08% — DO NOT operate any vehicle. Call a rideshare or stay where you are. Critical: this calculator is a rough estimate. Your actual BAC varies by ±30% based on individual factors. Never use a calculator to decide whether to drive.
Severe impairment
Significant motor function loss, vomiting risk, blackout risk. Medical concern at 0.30%+.
Risk & benchmark gauge
Current band
Severe
BAC: 1.818%
Industry benchmarks
- Your estimated BAC1.818%
- No effects threshold0.020%
- Buzzed driving (NHTSA)0.040%
- US legal limit (drive)0.080%
- Severe impairment0.150%+
- Hours until sober121.2 hrs
Key insights
This is an ESTIMATE, not a measurement
The Widmark formula gives a population-average BAC. Your actual BAC varies by ±30% based on stomach contents, body composition, medications, and individual liver function. Never rely on a calculator to decide whether to drive.
You eliminate alcohol at a constant rate
The average adult metabolizes about 0.015% per hour. Coffee, cold showers, and food do NOT speed this up — only time.
Impairment starts well below 0.08%
Studies show measurable impairment in reaction time, lane control, and judgment as low as 0.02%. The legal limit is the LEGAL line, not the SAFE line.
Recommended actions(4)
If you've been drinking AT ALL, do not drive
High priorityUse Uber, Lyft, public transit, designated driver, or stay where you are. The cost of a ride is dramatically less than a DUI ($10K+) or a fatality.
Impact: A first-offense DUI typically costs $10,000-15,000 in fines, legal fees, insurance hikes, and lost wages.
Wait 122 hours before driving
High priorityAt your estimated BAC of 1.818%, you need roughly 121.2 hours to drop to 0.0%. Add a buffer.
Impact: Even after BAC drops to zero, hangover impairment persists for additional hours.
Drink water alongside alcohol
Medium prioritySlows absorption, reduces hangover severity, and gives you a natural pacing mechanism. Aim for 1 glass of water per alcoholic drink.
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This tool is for informational purposes only and does not constitute medical advice. Consult a healthcare professional for advice specific to your situation.