Blood Alcohol Content BAC Calculator
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Standard Drinks Calculator

Use our standard drinks calculator to calculate the number of standard drinks in common servings of beer, wine, spirits and liqueurs.

In Australia a Standard Drink contains 10 grams (12.5ml) of alcohol regardless of serving size or drink type. The general rule of thumb that 2 Standard Drinks in the first hour will increase your blood alcohol content (BAC) to 0.05%, and from then on it only takes one Standard Drink per hour to maintain your BAC at that level.

Select the type and number of drinks consumed and press "Add". If your drink isn't listed, manually enter the alcohol level and size of the serving. Continue with each type of drink you consumed during the period.

Drink Type Alcohol Level Drank From Number

... Or enter your own:   %

List of drinks consumed:    (Clear all drinks)
No drinks added yet.
Alcohol Ingested:
0 ml
Standard Drinks: 0.00

Standard Drinks Chart

The following standard drinks chart shows the number of standard drinks in regular servings of beer, wines, spirits and pre-mix RTD's. A standard drink contains 10g (12.5ml) of alcohol.

Standard Drinks Chart

How Many Standard Drinks To 0.05?

2 Standard Drinks in the first hour will increase your Blood Alcohol Content (BAC) to approximately 0.05%, and then one Standard Drink per hour after that will keep you at that BAC level.

To do a quick calculation of the number of Standard Drinks that you can safely have to keep at or below a blood alcohol content of 0.05%, simply take the number of hours since your first drink and add 1 to it. Then calculate the number of "Standard Drinks" that you actually had, and compare the 2 results.


    1. You have been drinking for 3 hours and have had 7 375ml cans of light beer in that time.

    3 (hours) + 1 = 4 standard drinks "allowed" during that time
    7 (can) x 0.80 (standard drink equivalents) = 5.6 standard drinks
    Whoops. Too many!.

    2. You have been drinking for 2 hours and have had 3 bourbons in that time.

    2 (hours) + 1 = 3 standard drinks "allowed" during that time
    3 (bourbons) x 0.9 (standard drink equivalents) = 2.7 standard drinks
    Close! If you drink your next one slowly you should still be OK, but probably best to stop now.

While blood alcohol content will vary with gender, weight, age, and level of fitness, this quick calculation can help you to avoid the mistake of having "one more for the road" when you shouldn't.

It's also handy the next morning.

    3. It's 8:00am, you really tied one on last night, but if you don't go down to the shop and get some more Coke now, you will die. You started drinking with the boys at 8:00pm (12 hours ago) and you must have had 15 vodkas before they poured you into the taxi at 1am. So let's do the numbers.

    12 (hours) + 1 = 13 standard drinks "allowed" during that time
    15 (vodkas) x 0.9 (standard drink equivalents) = 13.5 standard drinks
    Guess what? You'd better walk to the shop - you're probably still over a bit over 0.05.

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This web site does not endorse drink driving or the excessive consumption of alcohol. Blood alcohol calculations are to be used as a guide only.