Australian Week Number Calculator
Easily determine the current week number using different standards including ISO 8601, US, and Australian Financial Year.
Current Week
19
Week of 12 May 2025 - 19 May 2025
Year: 2025
Week Numbering Standard
Multiple Week Numbering Standards
We support various week numbering systems to meet your specific needs.
ISO 8601 Standard
The international standard where weeks start on Monday and the first week of the year contains the first Thursday. This is the most widely used standard globally.
US Standard
In the US system, weeks start on Sunday. The first week of the year is the week containing January 1st.
Australian Financial Year
Calculate week numbers based on the Australian financial year, which runs from July 1st to June 30th. Essential for financial reporting and planning.
Need to Plan Your Year?
View our comprehensive year calendar with week numbers to help with your planning.
View 2025 Calendar