How much alcohol can I drink before driving?

Question

The law stipulates a maximum limit of 30 mg per 100 ml of blood. Alcohol absorption in the blood stream is affected by two things ? the body mass of the person and the amount of hydration or water content in the body. Let?s look at just how much alcohol content there is in common alcoholic drinks:
Alcoholic drink / serving sizeAlcohol percentageTotal ml of alcohol in 1 serving
Regular beer (330 ml or 1 pint)4%13.2 ml of alcohol
Regular whisky (30 ml or 1 small)43%12.9 ml of alcohol
Regular wine (100 ml or 1 glass)12%12 ml of alcohol
Virginia Tech University had conducted a study to see just how much alcohol one can consume and what percentage of blood alcohol content that relates to. Here are the findings.
For an average adult male who weighs about 65 Kg these are the limits. To stay within the legal limit this is what he can consume:
?2 pints of beer (660 ml)
Or
?1 large whisky (60 ml)
Or
?2 glasses of wine (200 ml)
Alcohol remains in the body and is metabolized slowly by the liver and the rest is excreted through urine, sweat and breath. Research has shown that it takes about one hour to process about 9.5 ml of alcohol in the body. The above data is the maximum amount you can consume to stay within the legal limit. This means that if you?ve had even a pint of beer, you will need to wait at least 90 minutes after you?ve had that drink to be able to drive again without being affected by alcohol. If you?ve had one large whisky, you will have to wait at least three hours before you can drive without being affected by alcohol. However, trace amounts of alcohol will continue to remain in the bloodstream for up to 12 hours. Never drive under the influence of alcohol, even if it is under the permissible limits.

Saul Pereira · Accepted Answer

The law stipulates a maximum limit of 30 mg per 100 ml of blood. Alcohol absorption in the blood stream is affected by two things ? the body mass of the person and the amount of hydration or water content in the body. Let?s look at just how much alcohol content there is in common alcoholic drinks:
Alcoholic drink / serving sizeAlcohol percentageTotal ml of alcohol in 1 serving
Regular beer (330 ml or 1 pint)4%13.2 ml of alcohol
Regular whisky (30 ml or 1 small)43%12.9 ml of alcohol
Regular wine (100 ml or 1 glass)12%12 ml of alcohol
Virginia Tech University had conducted a study to see just how much alcohol one can consume and what percentage of blood alcohol content that relates to. Here are the findings.
For an average adult male who weighs about 65 Kg these are the limits. To stay within the legal limit this is what he can consume:
?2 pints of beer (660 ml)
Or
?1 large whisky (60 ml)
Or
?2 glasses of wine (200 ml)
Alcohol remains in the body and is metabolized slowly by the liver and the rest is excreted through urine, sweat and breath. Research has shown that it takes about one hour to process about 9.5 ml of alcohol in the body. The above data is the maximum amount you can consume to stay within the legal limit. This means that if you?ve had even a pint of beer, you will need to wait at least 90 minutes after you?ve had that drink to be able to drive again without being affected by alcohol. If you?ve had one large whisky, you will have to wait at least three hours before you can drive without being affected by alcohol. However, trace amounts of alcohol will continue to remain in the bloodstream for up to 12 hours. Never drive under the influence of alcohol, even if it is under the permissible limits.