How Alcohol Metabolizes in the Body
Follow the rise, peak, and decline of blood alcohol concentration over time — and the biology behind each phase.
Blood alcohol concentration (BAC) describes the amount of alcohol in a person's bloodstream. After a drink, BAC can rise while alcohol is absorbed, reach a peak, and then decline as the body metabolizes and eliminates alcohol.
The curve is not identical for everyone. The amount and pace of drinking, food, body size and composition, medications, and individual metabolism can affect its shape and timing.
Use the interactive Alcohol Bell Curve to follow the general pattern from drinking begins through absorption, peak BAC, elimination, and back to zero. The values shown are educational reference points, not a personalized calculation.
Alcohol is absorbed into your bloodstream through the stomach and small intestine. While absorption is still outpacing elimination, BAC is increasing and the curve climbs. How quickly it climbs varies with the amount and pace of drinking, food, and individual circumstances.
The peak is where BAC stops rising and begins to fall. On this curve it reaches its highest point typically 30–90 minutes after your last drink. That range is an approximate reference, not a prediction — the timing may sit earlier or later for a given person.
Once absorption slows, the body continues metabolizing alcohol at a relatively constant rate — an average of about 0.015% BAC per hour. BAC declines and, as elimination continues, moves back toward 0.00%. Time is what drives the decline.
Move through the curve to see each phase and learn what is happening in the body.
The curve begins at 0.00% BAC. As drinking begins and alcohol enters the body, BAC starts to rise.
| Phase | Direction of BAC | What the Phase Represents |
|---|---|---|
| Drinking Begins | Starting to rise | The curve begins at 0.00% BAC. As drinking begins and alcohol enters the body, BAC starts to rise. |
| Absorption | Rising | Alcohol is absorbed into your bloodstream through the stomach and small intestine. BAC rises. What's happening: BAC is increasing. |
| Peak BAC | Highest point | BAC reaches its highest point typically 30–90 minutes after your last drink. Typical timing: 30–90 minutes after your last drink |
| Elimination | Declining | Your body metabolizes alcohol at a relatively constant rate — about 0.015% BAC per hour. BAC declines. Average elimination rate: About 0.015% BAC per hour The average person eliminates alcohol at a predictable rate, regardless of how much was consumed. |
| Back to Zero | Returning to zero | As the body continues eliminating alcohol, BAC declines toward 0.00% and returns to zero hours later. What matters: More time means a lower BAC as the body eliminates alcohol. |
Two people can drink the same amount and reach very different BAC results. Absorption, distribution, and metabolism differ from person to person, so the same drinks do not produce the same curve.
The amount and pace of drinking, food, body size and composition, medications, and other individual circumstances can each shift how quickly BAC rises, how high it peaks, and how long the decline takes. That is why the factors below describe general influences on the shape of the curve rather than an amount of BAC. Hydration is listed because dehydration may increase BAC; drinking water does not speed the body's elimination of alcohol.Time, your body, and other factors matter.
See how BAC can affect Florida DUI penalties · explore the Drug Matrix for non-alcohol indicators
General educational example — not a personal BAC prediction.
This example illustrates the shape of a BAC curve; it does not estimate any individual's BAC or determine when someone is safe to drive.
This visualization is an educational illustration of a general pattern. It shows the shape of a BAC curve using approved reference values, and nothing on this page is measured from, or fitted to, any individual. It cannot:
Do not use this page to decide whether to drive.
Publisher Docket
Absorption into the bloodstream and the steady rate of alcohol elimination.
Factors that can affect blood alcohol concentration, including body weight, sex, food, and time.
The general rise, peak, and decline pattern described by the alcohol bell curve.
The 30–90 minute range commonly cited for peak BAC after the last drink. This is a research review, not agency guidance.
Further Reading
Penalties and statutory consequences.
Category-based drug influence evaluation reference.
Evidence, legal issues, and defense preparation.
Publisher and attorney background.
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