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Week Number (ISO) Calculator

What week number is it?

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This tool finds a date's ISO week number — the standardized numbering (ISO 8601) where week 1 is the week containing the year's first Thursday, so week numbering stays consistent even though January 1st can fall on any weekday — along with the day-of-year count and how many days remain until year-end.

It is used in business and project management contexts where planning is organized by week number rather than calendar date (common in manufacturing, payroll and European corporate scheduling), and by anyone who needs to reference "week 33" on a report or invoice and wants to confirm exactly which dates that corresponds to.

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