the United States · 4 × 355 ml at 5 %
What is your BAC after 4 beers?
Estimated with the model behind the Abvy app. As of September 2026.
The answer
≈0.052% BAC
peak for a 80 kg man, light meal, first drink at 20:00
| peak | 22:56 0.52‰ |
|---|---|
| stays under 0.8‰ | the whole evening |
| back to zero | 03:13 after 7 h 10 min |
| pure alcohol | 56 g |
Rounded to ten minutes.
How this was calculated
4 × 355 ml at 5 % alcohol, the first at 20:00 and one every 45 minutes after it, for a 80 kg man who had a light meal beforehand - the same pharmacokinetic model the Abvy app runs, not a rule of thumb. Real values vary by roughly ±20-30 % with hydration, medication and genetics, so read the number as the middle of a range.
The same drinks for other bodies
Body water decides how far the same alcohol spreads: a lighter person or a woman reaches a higher peak from identical drinks and needs longer to get back to zero.
| Weight | Peak | Back to zero |
|---|---|---|
| 50 kg | 0.76‰ | 8 h 50 min |
| 60 kg | 0.66‰ | 8 h 10 min |
| 70 kg | 0.58‰ | 7 h 40 min |
| 80 kg | 0.52‰ | 7 h 10 min |
| 90 kg | 0.46‰ | 6 h 50 min |
| 100 kg | 0.41‰ | 6 h 30 min |
| Weight | Peak | Back to zero |
|---|---|---|
| 50 kg | 1.00‰ | 10 h 20 min |
| 60 kg | 0.89‰ | 9 h 40 min |
| 70 kg | 0.80‰ | 9 h 10 min |
| 80 kg | 0.72‰ | 8 h 40 min |
| 90 kg | 0.66‰ | 8 h 10 min |
| 100 kg | 0.60‰ | 7 h 50 min |
Rounded to ten minutes. Enter your own weight, meal and pace in the calculator to see your evening as a curve.
The legal limit in the United States
0.8‰ is the limit for drivers in the United States (NHTSA, "Drunk Driving"). The estimate above says nothing about whether you may drive: reaction time and judgement suffer well below the limit, the model has a wide margin, and a breathalyser measures where this page only estimates. The only safe number for driving is zero.
For a 80 kg man the model lands back at zero about 7 h 10 min after the first drink and never reaches 0.8‰ at this pace. A lighter body, an empty stomach or a faster pace push the peak up and the zero later; the table above shows the spread.
Abvy runs this estimate live while you drink: every glass you log moves the curve and the time you'll be back at zero.
iPhone beta on TestFlight
Android beta on Google PlayAbvy estimates - it never measures. It is not a breathalyzer and can't tell you whether you're under a legal limit or fit to drive.