Blood Alcohol Level (BAC) Chart: How Alcohol Affects Your Body and Your DUI Risk

Last updated: August 2026

Blood alcohol concentration (BAC) measures the percentage of alcohol in your bloodstream. In Florida and every other state, a BAC of .08% or higher makes you legally impaired to drive. BAC depends on your weight, sex, how much you drink, and how quickly, but many factors make it impossible to predict precisely, which is why you can’t rely on a chart to know if you’re safe to drive.

Blood alcohol concentration (BAC) is the standard measure of how much alcohol is in your system and the basis for DUI charges across the country. The charts below offer a general estimate of BAC by weight, sex, and number of drinks—but as we explain, they are approximations only, and no chart can tell you with certainty whether you’re safe or legal to drive.

What Is Blood Alcohol Concentration (BAC)?

BAC is the percentage of alcohol in your blood. A BAC of .08% means 0.08 grams of alcohol per 100 milliliters of blood—the threshold at which drivers 21 and older are considered legally impaired in every U.S. state.

Your BAC rises as you drink and falls as your body processes the alcohol. It’s affected by how much and how fast you drink, your body weight and composition, your sex, and whether you’ve eaten. Law enforcement measures BAC through breath, blood, or urine testing, and the result is central to most DUI prosecutions.

What Is the Legal BAC Limit in Florida?

In Florida, the legal BAC limit is .08% for drivers 21 and older, .04% for commercial drivers, and .02% for drivers under 21. You can still be charged with DUI below these limits if your driving is impaired.

Florida sets different BAC thresholds depending on the driver:

• .08% — Standard limit: Applies to most drivers 21 and older.
• .04% — Commercial drivers: Anyone operating a commercial vehicle is held to a stricter standard.
• .02% — Under 21: Florida’s zero-tolerance law means drivers under 21 face penalties at a very low BAC.

Importantly, you can be arrested and convicted for DUI even with a BAC under .08% if an officer believes your normal faculties are impaired. The number is one piece of evidence—not the whole case.

Blood Alcohol Level Chart for Women

The chart below estimates a woman’s BAC based on body weight and the number of drinks consumed in one hour. Highlighted cells indicate an estimated BAC at or above the .08% legal limit.

Estimated BAC — Women (by weight and drinks per hour)

Highlighted cells indicate an estimated BAC at or above .08%. One “drink” = 1.5 oz of liquor, 5 oz of wine, or 12 oz of beer. Estimates only.

Blood Alcohol Level Chart for Men

The chart below estimates a man’s BAC based on body weight and the number of drinks consumed in one hour. Highlighted cells indicate an estimated BAC at or above the .08% legal limit.

Estimated BAC — Men (by weight and drinks per hour)

Highlighted cells indicate an estimated BAC at or above .08%. One “drink” = 1.5 oz of liquor, 5 oz of wine, or 12 oz of beer. Estimates only.

What Counts as One “Standard Drink”?

One standard drink contains about 0.6 ounces of pure alcohol. That equals roughly 12 oz of regular beer (5% ABV), 5 oz of wine (12% ABV), or 1.5 oz of distilled spirits (40% ABV).

The charts assume standard drink sizes. In reality, many drinks contain more alcohol than one standard serving:

• A craft beer or IPA may be 7–9% ABV—well above the 5% standard
• A generous pour of wine can be two standard servings
• A mixed drink or cocktail may contain two or three shots of liquor

This means your actual BAC may be significantly higher than a chart suggests if your drinks are larger or stronger than a standard serving.

What Factors Affect Your Blood Alcohol Level?

BAC is influenced by body weight and fat composition, biological sex, how quickly you drink, whether you’ve eaten, medications, and certain medical conditions. Because these vary from person to person, no chart can predict your exact BAC.

Many variables affect how alcohol registers in your body:

• Body weight and composition: Heavier people and those with more muscle generally reach lower BACs than lighter people, because alcohol distributes through body water.
• Biological sex: Women typically reach higher BACs than men of the same weight, due to differences in body water and enzyme activity.
• Rate of drinking: The faster you drink, the higher your BAC climbs, because your body can’t keep up.
• Food in your stomach: Eating before or while drinking slows alcohol absorption.
• Medications: Some medications interact with alcohol and can intensify its effects.
• Medical conditions and metabolism: Individual metabolism and certain health conditions can raise or lower your BAC.

How Long Does It Take for Alcohol to Leave Your System?

Your body eliminates roughly one-half ounce of alcohol—about one standard drink—per hour. Nothing speeds this up. Coffee, cold water, exercise, and fresh air do not lower your BAC; only time does.

Your body oxidizes (burns off) alcohol at a steady rate of about one-half ounce per hour, regardless of what you do. This is one of the most important and misunderstood facts about alcohol.

Common “sobering up” methods are myths:

• Drinking coffee makes you a more alert drunk—not a sober one
• Cold showers or splashing water on your face do nothing to your BAC
• Exercising, “sweating it out,” or fresh air won’t speed elimination
• Eating after drinking doesn’t lower a BAC that’s already risen

Only time allows your body to process alcohol. If you drink faster than your body can eliminate it, your BAC keeps rising.

Can You Rely on a BAC Chart to Know If You’re Safe to Drive?

No. BAC charts are approximations based on averages. Because so many personal factors affect alcohol absorption and elimination, your actual BAC could be higher than a chart shows. The safest choice is not to drive after drinking at all.

The charts on this page are a fair general guide, but they should never be relied on to decide whether you can legally or safely drive. Two people of the same weight and sex can have very different BACs after the same number of drinks. The only way to be certain you won’t be charged with DUI is to not drive after drinking.

How Does BAC Evidence Work in a DUI Case?

BAC test results are strong evidence but not infallible. Breathalyzer calibration errors, improper testing procedures, rising-BAC issues, and medical conditions can all be grounds to challenge a BAC reading in a DUI defense.

A BAC result at or above .08% doesn’t automatically guarantee a conviction. Experienced DUI defense attorneys frequently challenge BAC evidence on grounds such as improperly calibrated or maintained breathalyzer equipment, officers who didn’t follow required testing procedures, the “rising BAC” defense (your BAC was still climbing and was below the limit while you were actually driving), and medical conditions or substances that can skew breath test results.

Because BAC evidence is technical, the details matter. A careful review of how the test was administered and how the equipment was maintained can reveal weaknesses in the prosecution’s case.

Facing DUI Charges in Central Florida?

A DUI charge is serious, but a BAC reading is not the end of the story. The Defense Group examines every aspect of a DUI case—including how BAC evidence was collected and whether proper procedures were followed—to build the strongest possible defense.

Call one of our two locations at 407-743-8430 or 407-250-9557 for a prompt, free consultation with an experienced Central Florida criminal defense attorney. We are available 24 hours a day for emergencies, and appointments can be arranged for nights or weekends if necessary.

This chart and article are for general informational purposes only and do not constitute legal or medical advice. Your specific blood alcohol level will vary depending on body fat, food intake, medical conditions, metabolism, and other factors.