ISOWEEKNUM Google Sheet Formula

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ISOWEEKNUM Formula Syntax

=ISOWEEKNUM("2023-01-01")

Example Use Case

Finding the ISO week number of a date for standardized week numbering

Understanding the ISOWEEKNUM Formula

The ISOWEEKNUM function in Excel returns the ISO week number (1-53) for a given date, following the international standard ISO 8601. It's a week numbering tool for standardized dating—like international reporting or project planning using consistent week definitions.

ISOWEEKNUM("2023-01-01") returns 52, since January 1, 2023 falls in the 52nd ISO week of 2022. It takes a single date argument, calculating the standardized week where weeks start on Monday and the first week has a minimum of 4 days in the new year.

Why Use ISOWEEKNUM?

ISOWEEKNUM ensures standardized weeks—think international business or aligned reporting periods. Its ISO 8601 compliance makes it valuable for global operations, coordinated schedules, or anywhere consistent week numbering matters across countries.