Calculator
Educational estimate only. This tool cannot account for sleep loss, medications, health conditions, or individual metabolism differences. If unsure, use stored milk/formula and ask your clinician.
How this drinking and breastfeeding calculator works
This tool estimates blood alcohol concentration (BAC) using a standard Widmark-style approach and then estimates how long it may take for alcohol levels to fall to a chosen target. Because alcohol in milk closely mirrors alcohol in blood, the calculator can help with timing decisions after drinking.
The output is a planning aid, not a diagnosis. Real-world alcohol processing varies a lot from person to person. If your baby is newborn, premature, medically fragile, or feeding concerns exist, use extra caution and speak with your pediatric or lactation professional.
Quick safety principles
- If you feel impaired, avoid nursing directly and avoid bed-sharing.
- Alcohol level in milk falls as your blood alcohol falls over time.
- Pumping and dumping does not speed alcohol removal from your body.
- When in doubt, feed previously expressed milk or formula and wait longer.
What counts as one drink?
A “standard drink” is based on pure alcohol content, not glass size. In the U.S., one standard drink has about 14 grams of alcohol, roughly:
- 12 oz beer (~5% ABV)
- 5 oz wine (~12% ABV)
- 1.5 oz distilled spirits (~40% ABV)
Large pours, high-ABV cocktails, and craft beverages can count as more than one drink.
How to interpret your result
Estimated current BAC
This estimate helps gauge whether alcohol may still be present in meaningful amounts. The calculator uses conservative elimination assumptions, but actual clearance can be slower or faster.
Additional waiting time
If the result says “wait,” that is the estimated extra time from now before reaching your selected target level. Choosing a stricter target gives a longer waiting time.
Earliest estimated feed time
This is the projected clock time when your blood alcohol may be near the selected threshold. It is not a guarantee, but a practical guide for scheduling feeds or bottle plans.
Practical breastfeeding plan after drinking
- Feed your baby before drinking when possible.
- Keep expressed milk available for flexibility.
- Set a phone reminder based on your calculated wait time.
- Stay hydrated, eat, and rest to support overall recovery.
- Use safe sleep practices and avoid caring for baby while impaired.
Limitations of any alcohol timing calculator
No calculator can perfectly model individual metabolism. Body composition, liver function, medication interactions, food intake, fatigue, and illness all influence alcohol effects and elimination. Also, “feeling fine” is not always a reliable indicator of safety.
If there is uncertainty, choose the safer option: delay direct breastfeeding, use stored milk/formula, and seek professional guidance.
Frequently asked questions
Do I need to pump and dump?
Usually, pumping and dumping is for comfort or maintaining supply, not for faster alcohol removal. Alcohol leaves milk as blood alcohol drops.
Is one drink always safe?
Risk depends on timing, infant age, and your individual response. A single drink may clear relatively quickly for many people, but timing still matters.
When should I contact a professional?
Contact your clinician or lactation consultant if you have repeated uncertainty, concerns about infant behavior after feeds, or questions about medications and alcohol combined.