BAC Timeline Calculator — Your Whole Session, Mapped
Log each drink at the time you had it and see your estimated blood alcohol concentration rise and fall across the evening — not just a single number.
🍹 BAC Session Timeline
Multiple drinks, each with its own time
Drinks This Session
Current Estimated BAC
0.049%
Below the legal driving limit — still not necessarily safe to drive
0.056%
Peak BAC
0h
To Legal Limit
3h 16m
To Fully Sober
📈 BAC Timeline
From your first drink through to sobriety.
How the Timeline Is Built
🍻 Every Drink, Its Own Time
Unlike a single "how many drinks total" estimate, each drink here has its own timestamp, so the curve reflects the actual pace of your session.
⚗️ Widmark Formula
The same population-average formula used by our standard BAC calculator, applied continuously across the session instead of at a single moment.
📉 Elimination Rate
Your body clears alcohol at roughly 0.015% BAC per hour regardless of how much you drink — that steady decline is what shapes the downward slope of the curve.
🚗 Legal Limit Marker
The dashed line on the chart marks 0.08% — the most common US legal driving threshold — so you can see exactly when your estimated curve crosses it.
— FAQ