BAC Calculator — Widmark Formula, Custom ABV & Impairment Guide
Estimate your blood alcohol concentration using the Widmark formula with custom ABV support for craft beer, wine, and liquor.
BAC Calculator
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Impairment Level
Moderate impairment — slowed reaction time, reduced judgment
Peak BAC (Before Metabolism)
▼ 0.080% BAC
Estimated Time Until Sober (0.00% BAC)
▲ ~4 hours (≈ 201 minutes)
Time Until Under Legal Limit (0.08%)
At or under 0.08% — still, do not drive
Standard Drinks Consumed
3 drink(s) at 5% ABV · ~42 g alcohol (custom)
Formula
Widmark Equation (ρ=0.68, ABV 5%, β=0.015/hr)
Scenario Comparison
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0.00–0.02%
No detectable impairment
0.02–0.05%
Reduced coordination
0.05–0.08%
Slowed reaction time
0.08%+
Significant impairment
⚠ Do Not Use This Calculator to Make Driving Decisions
This tool provides a rough estimate only and cannot be used to determine if it is legal or safe for you to drive. Everyone metabolizes alcohol differently. Your actual BAC may be significantly higher or lower than this estimate due to: individual metabolism, food consumption, medications, hydration status, liver function, and other factors. Even at BAC levels below the legal limit of 0.08%, your driving ability may be impaired. If you have consumed any alcohol, the only safe choice is not to drive. Arrange a designated driver, use a rideshare service, or wait significantly longer than this calculator suggests.
What Counts as One Standard Drink?
12 oz
Beer (5% ABV)
~1 regular can/bottle
5 oz
Wine (12% ABV)
~1 standard glass
1.5 oz
Distilled Spirits (40% ABV)
~1 shot
Each = 14 grams (0.6 oz) of pure ethyl alcohol
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