Blood Alcohol Concentration (BAC) Calculator

Estimate Your Blood Alcohol Concentration

⚠ Important: This tool is not to be used as a reliable reading and should not be relied upon. There are many variables that affect BAC which are not all accounted for here (including food intake, drink type, metabolism, health conditions and more).

Use this BAC calculator for an approximate estimate of the amount of alcohol in your bloodstream and how that affects the legal driving limits in New South Wales.

The only way to be certain you’re under the legal limit is to not drink any alcohol before or during driving.

Drink Driving Offences in NSW

Drink driving is a criminal offence in NSW, and penalties vary based on your BAC range and licence type:

• High Range: 0.15 and above – Heavy fines, lengthy disqualification, mandatory interlock program, possible prison sentence.

• Mid Range: 0.08 – 0.149 – Significant fines, disqualification, mandatory interlock program, possible prison.

• Low Range: 0.05 – 0.079 – On-the-spot fine and 3-month suspension for first offence, possible court election.

• Special Range: 0.02 – 0.049 – Applies to L/P platers and interlock drivers.

• Novice Range: Above 0.00 – 0.019 – Applies to L/P platers and interlock drivers.

• DUI (Driving Under the Influence): No BAC reading required; offence can be proven by signs of intoxication.