Blood Alcohol Concentration Estimation Tool

This tool can be used to provide a rough estimate of your individual blood alcohol concentration (BAC) after consuming a defined amount of alcohol in a single sitting. Please remember this is an estimate and it will not be 100% accurate, as there are a wide range of factors that can affect BAC in individuals (such as the amount of food eaten, type of drinks consumed and metabolic rate) and these are not taken into consideration when using this tool. Therefore, under no circumstances should this tool be used to determine whether you should drive. The only way to be totally sure that you remain under the legal BAC limit is not to drink any alcohol at all.

Calculate your blood alcohol concentration

Are you male or female?

Male

Female

What is your weight in kilograms?

How many standard drinks have you consumed in this sitting?

Click here to use the standard drinks calulator

How many hours have you been drinking for in this sitting?

Evaluation

Your total BAC is
There is no measureable alcohol in your system.

Evaluation

Your total BAC is
Persons on a provisional drivers license have surpassed the legal limit for driving (you must totally abstain from drinking alcohol to maintain a BAC < 0.02).

Evaluation

Your total BAC is
You have reached the legal BAC limit for driving.

Evaluation

Your total BAC is
You have surpassed the legal BAC limit. The alcohol will have reduced your inhibitions and your judgment and movement will be impaired.

Evaluation

Your total BAC is
You may exhibit slurred speech, loss of coordination and balance, impaired vision, emotional instability, nausea and vomiting.

Evaluation

Your total BAC is
You are classified as a high-risk state of intoxication. You may be sleepy, cannot walk without help, lose bladder control, experience loss of memory and lose consciousness.

Evaluation

Your total BAC is
You are at a dangerous level of intoxication that can lead to coma and even death.

Do you know when to stop? A driver's guide to staying under 0.05 BAC [online]. Canberra, ACT: Australian Transport Safety Bureau; 2011 [cited February 2011]. Available from: URL link
Alcohol and its effects [online]. Parkside, SA: Government of South Australia Health, Drug and Alcohol Services; 2010 [cited February 2011]. Available from: URL link

More information

For more information on drinking alcohol, including drinking disorders and alcohol's effect on the body, as well as some useful tools, see Alcohol and Drinking.

Created: 30/3/2011