BAC Calculator

Blood Alcohol Concentration (BAC) is a scientific measure used to assess intoxication levels.

It quantifies the amount of alcohol in your bloodstream, providing an objective metric for understanding impairment.

How to Use the BAC Calculator

  1. Enter the Volume and Alcohol Percentage: Input the volume (in millilitres) and alcohol by volume (ABV) percentage of your drink.

  2. Number of Servings: Enter the number of servings or drinks you’ve had.

  3. Time Spent Drinking: Input the total time you’ve spent drinking. A value of 0.25 is equal to 15 minutes.

  4. View Your BAC: The calculator will display your estimated BAC. Remember, this is just an estimate, and individual factors such as your body weight, health, and metabolism can affect your actual BAC.

  5. If your BAC reaches 0.05 or higher, you are legally impaired and cannot drive in Australia. Always ensure your BAC is below this limit before considering driving.


Short-Term Effects of Blood Alcohol Concentration (BAC) Levels

BAC up to 0.05 – Mild Effects

Relaxation, increased confidence, and slight euphoria. Minor impairment of judgment and coordination.

BAC 0.05 to 0.08 – Noticeable Impairment

Reduced inhibitions, slower reaction times, and impaired coordination. Increased risk of accidents.

BAC 0.08 to 0.15 – Significant Impairment

Noticeable slurring, poor balance, and blurred vision. High risk of dangerous behaviours and accidents.

BAC 0.15 to 0.30 – Severe Impairment

Difficulty walking, extreme drowsiness, possible vomiting, and memory blackouts. Serious risk of harm to self and others.

BAC Over 0.30 – Life-Threatening

Potential loss of consciousness, slow breathing, and life-threatening alcohol poisoning. Immediate medical attention required.

Factors Affecting BAC

BAC can be influenced by your body weight, age, sex, health status, and whether you’ve eaten. Always consider these factors when drinking.

This BAC Calculator provides an estimate of your blood alcohol concentration based on the information you provide. It should not be used as a definitive measure of your BAC.

Remember: The safest option is to avoid alcohol if you plan to drive.

Enhance Your Knowledge with an RSA Course

If you’re interested in learning more about BAC, standard drinks and responsible alcohol service, consider enrolling in a Responsible Service of Alcohol (RSA) course.

Connect Skills Institute offers a comprehensive RSA courses that cover everything you need to know, including how to calculate standard drinks and the legal responsibilities of serving alcohol.