Estimate Alcohol Remaining the Next Morning
Use this calculator to estimate your current blood alcohol concentration (BAC) and how much longer alcohol may remain in your system. This is an educational estimate only.
Model used: Widmark-style estimate with average elimination rate of 0.015 BAC per hour. Real metabolism can vary significantly.
What This Morning After Drinking Calculator Does
This morning after drinking calculator gives a rough estimate of how much alcohol may still be in your body when you wake up. A lot of people assume that after sleeping they are automatically sober. Unfortunately, that is not always true.
Your body removes alcohol gradually. Sleep, coffee, cold showers, and greasy food do not speed this process much. Time is the biggest factor.
How the Estimate Is Calculated
The calculator uses a simplified Widmark-style equation:
- BAC from drinks: based on number of standard drinks, body weight, and a body-water factor
- Metabolism while drinking: subtracts estimated elimination during the hours you were still drinking
- Metabolism after your last drink: subtracts more BAC based on elapsed time since last drink
It then estimates:
- Current BAC
- Time until BAC may drop below 0.08
- Time until BAC may drop below 0.05
- Time until BAC may reach approximately 0.00
How to Count Standard Drinks Correctly
Common equivalents
- 12 oz regular beer (about 5% ABV) = 1 standard drink
- 5 oz wine (about 12% ABV) = 1 standard drink
- 1.5 oz distilled spirits (about 40% ABV) = 1 standard drink
Where people underestimate
- Large wine pours at home are often 1.5–2 drinks
- Strong craft beers (7–9%+) can be 1.5–2+ drinks each
- Cocktails often contain multiple shots
If you underestimate drink count, your true BAC can be much higher than your estimate.
Why Morning-After Decisions Matter
Even when you feel “mostly fine,” alcohol can still affect reaction time, judgment, and coordination. This matters for driving, biking, caregiving, and work tasks requiring attention.
If you drank heavily the night before, a conservative approach is best: give yourself more time than you think you need, hydrate, eat, and avoid risk-heavy decisions early.
Important Limits of Any BAC Calculator
No online tool can fully model your body in real life. Results can be off because of:
- Different metabolism rates between individuals
- Food intake timing and meal composition
- Medication interactions
- Sleep deprivation, illness, or dehydration
- Errors in drink size, ABV, and timing
Because of these limits, this tool should be used for awareness and planning—not as legal, medical, or safety clearance.
Morning-After Safety Checklist
- Assume alcohol may still be present if you drank heavily or late.
- Do not drive if there is any uncertainty.
- Hydrate and eat a balanced meal.
- Give yourself additional time before important tasks.
- If symptoms are severe (confusion, vomiting, trouble breathing), seek urgent medical care.
Final Takeaway
A morning after drinking calculator can be a useful reality check. Most people clear alcohol slower than they expect, especially after long evenings or high drink counts. Use this estimate to make safer decisions, and when in doubt, wait longer.