Legal Stuff...


This is not intended as a scientific tool for measuring Blood Alcohol Concentration (BAC), but for adults of legal drinking age to understand the factors that affect their BAC. The information presented should not take the place of your own responsible decisions about drinking alcohol, or about whether and when it will be safe for you to drive. The effects of alcohol vary among individuals because of many factors and may be different for the same person at different times. The BACs shown are solely for illustrative purposes, and do not reflect the interaction of alcohol with prescription, over-the-counter, or illegal drugs. Mixing any drug with alcohol can be dangerous to you and to others.

Hello there...

Tell us about yourself

  • What is your gender?

    Women metabolize alcohol differently than men. For example, women have less fluid per pound in their bodies, so there is less water to dilute the alcohol they consume. As a result, women will tend to feel the effects more than men of equal body weight after consuming the same amount of alcohol.

  • What is your weight?

    The more mass and fluid in your body, the more diluted the alcohol in your blood will be. The more diluted the alcohol, the lower your BAC.

  • What is your height?

    This helps us determine the volume and composition of your body.

  • What is your age?

    Age has a small effect on how efficiently your body can process alcohol.

Grab a chair and

Pull up to the bar...

Your Weight


Your Height


Choose a drink

Please make a selection

have a drink:

  • Water
  • Light beer
  • Beer
  • Shot of Liquor
  • Glass of Wine
  • Standard Mixed Drink
  • Margarita
  • Long Island Iced Tea

time to drink:

  • 1 minute
  • 15 minutes
  • 30 minutes
  • 1 hour

See how each variable affects your blood alcohol level!

= over the legal limit - too drunk to drive

  • Man, 160lbs 0.00
  • Man, 185lbs 0.00
  • Man, 225lbs 0.00
  • Woman, 105lbs 0.00
  • Woman, 130lbs 0.00
  • Woman, 160lbs 0.00


Total drinks:


Elapsed time drinking:

0 mins.

Time Until .00 BAC:

0 mins.

You feel a little warm and relaxed. You’re experiencing slight euphoria and loss of shyness, but no loss of coordination.

You are feeling relaxed, talkative, and mildly euphoric. Your inhibitions are lowered and your reasoning and memory are impaired slightly. Your coordination may be mildly impaired.

Your balance might be off, and your speech slurred. Your judgment and self-control will be reduced, and your reasoning, ability to assess risk, and memory may be impaired. At .08 it is illegal to drive in all 50 states.

You believe you are functioning better than you are. You are noisy and may engage in possibly embarrassing behaviors. There is a noticeable reduction in your reaction time.

You should be very clumsy and clearly drunk at this point. Your judgment and memory are getting worse, as well as vision, reaction time, and hearing.

You’re in ‘blackout’ territory . It’s very likely that you could have large gaps of memory missing the next morning. Drivers with BAC of .15 or more are responsible for more than half of the alcohol-related traffic fatalities in the United States.

You should’ve hit the brakes a long time ago. You are sloppy drunk and will need assistance walking. Your inability to keep your hands steady might cause you to spill it if you have another drink. You’re in danger of passing out, and should have severe nausea at this point, as your body is trying to expel the alcohol. You could conceivably die from choking on your vomit.

May experience extreme impairment, including total mental confusion, nausea and vomiting, difficulty walking, etc.

You may pass out or experience a loss of consciousness. You could die of alcohol poisoning. Consuming this much alcohol is dangerous and possibly life-threatening.

If you have not already lost consciousness, drinking to this level may result in coma, or even worse death.

Lower levels might kill you, but a .40 stands a much greater chance. You could easily lapse into a coma or die due to respiratory arrest. Death occurs in at least half the drinkers who reach this BAC.

Your results

Let's see how you are doing...



Please note: This estimated BAC should NOT be used to decide whether or not to drive after drinking. The safest decision is to never drink and drive.


All Done?

Want to try the virtual bar again or share your experience with your friends so they can discover their limits?

The calculations and the BAC effects shown in B4UDrink have been provided and verified by Dary Fiorentino, Ph.D., DF Consulting, one of the country’s leading authorities on the effects of alcohol.

Nutrition information supplied by Ellen Sviland, MS, RD, LD, CNSD, Registered Dietician in the Washington D.C. metro area.

Let's see what would have happened if you

were eating food

The BAC calculations presented in B4UDrink assume that you are drinking on an empty stomach.

On an empty stomach the alcohol you consume is usually fully absorbed within 30-60 minutes. With food the absorption effect is extended thus reducing your BAC - 30 minutes after drinking, food creates a reduction of 34-81% in BAC, at 60 minutes the reduction in BAC is as much as 32-58%, and at 2 hours the reduction is 22-54%.

The exact amount of the reduction depends upon many factors, including the meal size (calories), food composition (type of food), and your metabolism. Research has shown that high protein meals (such as meat, fish, poultry, dairy, eggs, and tofu) reduce peak BAC levels the most followed by high carbohydrate meals (pasta/rice, breads/rolls, and potatoes) while high fat meals have little effect on reducing BAC levels.

Generally, a typical 1/4 lb. cheeseburger contains at least 28 grams of protein and 530 calories. By comparison, a slice of cheese pizza contains 12 grams of protein and 240 calories, and a serving of pretzels has 3 grams of protein and only 110 calories. These examples and many other factors can affect your individual BAC.

The following options are intended to illustrate what effect food can have on one’s BAC assuming the food is consumed 15 minutes prior to a 30 minute drinking session.

For illustrative purposes, a peak BAC of just under .08 is being used for the no food condition.

  • No Food
  • 500 calories, high protein
  • 1000 calories, high protien
  • 500 calories, high carbs
  • 1000 calories, high carbs
  • 500 calories, high fat
  • 1000 calories, high fat

Example: Ingredients

Assumes food is consumed 15 minutes prior to a 30 minute drinking session.

Remember the difference food makes in your BAC may be higher or lower than presented here.

On Average, College students reported drinking more than 4-5 drinks in a two hour period about 2 times per week.