Blood Alcohol Calculator

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Blood Alcohol Calculator
For multiple types of drinks.

Drink Vol.


Australia UK USA



Grams of


Ave Hours to
Zero BAC

0.0 (0.0 - 0.0)

Ave Hours to
0.05 BAC

0.0 (0.0 - 0.0)



Blood Alcohol Calculator Summary

The Blood Alcohol Calculator enables you enter up to six different types of drinks and the number of each type of drink, you may have in a night. You can then calculate the number of standard drinks you've consumed. You can easily calculate the number of standard drinks for a single type of drink, or for multiple types of drinks using the Blood Alcohol Calculator.

The Blood Alcohol Calculator is written for Australians, but when reading literature online we are often read material from overseas. The UK and USA define the number of grams of alcohol in a standard drink differently from Australia. By selecting the country the Blood Alcohol Calculator can determine the number of standard drinks for the country. That also means if you're from America or the UK, you can also use the Blood Alcohol Calculator for your country.



Blood Alcohol Calculator

Previously I wrote the Standard Drink Calculator to help calculate the blood alcohol content when drink the one type of drink. The reality is when we socialise, we'll often drink a number of different types of drinks. It's not unusual in our family to start with a whisky, move on to a beer, then with food have a white or red wine, the perhaps a port to finish the night off. The Standard Drink Calculator doesn't work well in the situation where's there's a number of different types of drinks consumed in the one night, which is handled better in the Blood Alcohol Calculator.

To determine your blood alcohol content you need to know or estimate the volume of your glass, and the per cent alcohol by volume. Most of the time you can read these values off the labelling in the case of bottles and cans. But you may need to estimate when others serve you alcohol.

When being served alcohol in a restaurant it may not be easy to determine the alcohol content or the volume of the glass. In that case it may be necessary to ask the wait staff.


The volume of the container such as can, bottle, or glass.

Alcohol %ALC/VOL

The alcohol content is shown on the container as the percentage alcohol by volume.


Whilst the Blood Alcohol Calculator enables you to enter the number of each type of drink you've consumed. If for example you have three beers and two shots, you only need to enter these into two rows and enter the number for the type of drink.


By default the Blood Alcohol Calculator is set for usage in Australia. Different countries define a standard drink with different amounts of alcohol. A standard drink as defined in the UK contains less alcohol than a standard drink in Australia, which in turn has less alcohol than a standard drink in the USA.

Standard Drinks

The number of standard drinks based on the size/volume, per cent alcohol by volume, for the number of drinks, for the nominated country.

Ave Hours to Zero BAC

This number is the average number of hours for the liver to metabolise the alcohol. The figures to the right are the average taking into account the minimum and maximum time the liver metabolises alcohol. A damaged liver for example could take the maximum time.

Ave Hours to 0.05 BAC

This number is the average number of hours to reach 0.05 taking into account the litres of blood blood an average person has. The figures to the right show the minimum and maximum based on the range of litres of blood for adult humans. It should be noted this figure does not take into account the metabolising time of the liver but uses the average figure for the liver.


  • The Standard Drink Calculator may be easier to use if you are only drinking a single type of drink. You can find the Standard Drink Calculator at, or use the Standard link in the menu above.
  • Spirit measures for a single spirit drink are 15ml, 30ml and 60ml. The measures are not defined if the spirit is mixed such as in a cocktail.

  • There is no prescribed sizes for beer, stout or ale. But there are common sizes of glass names, however the names may differ across Australia.

  • On average the body metabolises 7.5 grams of alcohol, however this can vary from 4 - 12 grams.

  • The human adult body contains from 4.5 to 5.5 litres of blood. Five litres has been used as the average. Another fiture often mentioned is the amount of blood is estimated at 7% of the body weight.

  • As you can see the rate at which the liver can metabolise alcohol can have a large impact on the time for the body to remove the alcohol. In addition the volume of blood the body contains also affects the blood alcohol content. A slow processing liver with a person with a smaller frame could result in a person having a much higher blood alcohol content at a point in time than expected.

  • The location where someone lives also affects the amount of blood their body has. A person living at a higher altitude will have a larger amount of blood due to their oxygen requirements.

  • When does the time start? That depends. If you're a consistent drinker over the night the time starts when you start drinking. Keep in mind it takes approximately 20 minutes for your body to start processing the alcohol, so it can take a while for your BAC to peak. If you down quite a few shots at the end of the night, then it's probably best to start from then. Keep in mind the calculator is just an estimate.

  • A simple guide to drinking is allow an hour for each standard drink and then add an additional hour to stay under 0.05.

  • Some drinking containers can help you, but others can mislead you. Bottles and cans let you know immediately the volume and alcohol content. At restaurants glass sizes vary so you may find it hard to estimate. At home there's such a variety of glass sizes you should probably find glasses that help you. E.g. Know the size by measuring the volume. Perhaps there's marks on the glass to help when pouring mixed drinks, if not then perhaps use a standard measure.

  • If being zero is vital (due to employment or driving restrictions), it's best to be very conservative and use the maximum time to zero, or even longer. Best to be error on the side of caution than take any chances.

  • The Blood Alcohol Calculator is based on the time it takes for the body to metabolise alcohol. However this time can be greatly increased if there is food intake as food digestion slows the rate at which alcohol is absorbed. This could mean it can take longer to reach the peak, and importantly, for those who need to be at zero BAC, the time it takes to return to zero.


The Blood Alcohol Calculator web app comes with no warranty expressed or implied. The Blood Alcohol Calculator web app is only for informational purposes and is not guaranteed to be error free. The information on this page is not intended to be advice.



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