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BAC Chart

Interactive BAC reference chart showing estimated BAC levels by body weight and number of drinks. Includes effects at each BAC level and legal limits.

⚠️ Educational Tool Only — Never Drink and Drive

This calculator is for educational purposes only and provides estimates based on averages. Actual BAC depends on many individual factors. Never rely on a calculator to determine if you are safe to drive. If in doubt, don't drive. Call a rideshare, taxi, or designated driver.

Select biological sex:
BAC Reference Chart — Male
Estimated BAC after 1 hour of drinking. Click any cell for details. Values at or above 0.08% exceed the U.S. legal driving limit.
Weight (lbs)1 drink2 drinks3 drinks4 drinks5 drinks6 drinks7 drinks8 drinks9 drinks10 drinks
1000.030.080.120.170.210.260.300.350.390.44
1200.020.060.100.140.170.210.250.290.330.36
1400.020.050.080.110.150.180.210.240.280.31
1600.010.040.070.100.130.160.180.210.240.27
1800.010.040.060.090.110.140.160.190.210.24
2000.010.030.050.080.100.120.140.170.190.21
2200.010.030.050.070.090.110.130.150.170.19
2400.000.020.040.060.080.100.120.140.160.17
2600.000.020.040.050.070.090.110.120.140.16
Legend:< 0.040.04 – 0.0790.08 – 0.149(illegal to drive)0.15+
Effects at Each BAC Level
How alcohol affects your body and mind at different blood alcohol concentrations.
0.00 – 0.019%Sober

No significant impairment. Normal behavior and cognitive function.

0.02 – 0.039%Minimal Effects

Slight relaxation and mild sense of well-being. Little to no observable impairment.

0.04 – 0.059%Buzzed

Lowered inhibitions. Mild impairment of reasoning, memory, and reaction time.

0.06 – 0.079%Impaired

Reduced coordination and reaction time. Judgment is noticeably affected. Driving ability compromised.

0.08 – 0.099%Legally Drunk

Over the legal limit in all U.S. states. Significant impairment of motor control, judgment, and reaction time. Illegal to drive.

0.10 – 0.149%Very Impaired

Major loss of balance and coordination. Slurred speech. Significantly reduced reaction time and reasoning ability.

0.15 – 0.199%Severe Impairment

Disorientation and possible nausea. May need assistance walking. High risk of injury from falls.

0.20 – 0.299%Dangerous

Loss of consciousness possible. Risk of aspiration and alcohol poisoning. Medical attention may be needed.

0.30%+Life-Threatening

Alcohol poisoning. Loss of consciousness. Breathing may stop. Risk of death — call 911 immediately.

Disclaimer: This BAC chart provides estimates based on the Widmark formula and is intended for educational purposes only. Actual BAC depends on many factors not captured here, including food intake, medications, metabolism rate, hydration, liver function, and drinking pace. These values assume standard drinks (14g of pure alcohol each) consumed evenly over one hour. Never rely on any calculator or chart to determine whether it is safe to drive. When in doubt, do not drive.

How It Works

This chart displays estimated BAC values calculated using the Widmark formula for various combinations of body weight and number of standard drinks consumed within one hour. Each cell is color-coded: green (below 0.04%), yellow (0.04–0.079%), orange (0.08–0.149%), and red (0.15%+). The chart assumes standard drinks (14g of pure alcohol each) and no food intake. Use this as a general reference — your actual BAC will vary.

Frequently Asked Questions

What do the colors on the BAC chart mean?

Green (0.00–0.039%): Below impairment threshold. Yellow (0.04–0.079%): Some impairment, approaching legal limit. Orange (0.08–0.149%): Over legal limit, significant impairment. Red (0.15%+): Severe impairment, dangerous BAC level.

Does body weight really affect BAC?

Yes. Alcohol distributes through body water. Heavier individuals have more body water, so the same amount of alcohol produces a lower BAC. This is why a 200-lb person will have a lower BAC than a 120-lb person after the same number of drinks.

Why does gender affect BAC?

On average, women have a higher proportion of body fat and less body water than men of the same weight. Since alcohol distributes through body water, women typically reach a higher BAC than men of equal weight after consuming the same amount of alcohol.