# Calendar Week Calculator

> Show current calendar week (CW) and convert date to calendar week.

- Open in browser: https://pockettoolbox.org/en/calendar-week
- Runs entirely in your browser; files and input are never uploaded.

## How it works

Quickly determine the current calendar week or convert any date into a week number.

The tool instantly shows you today's calendar week. Use the date field to select a specific day to determine its CW number according to the ISO-8601 standard. This is particularly helpful for scheduling and project coordination.

Calculates the calendar week number according to the ISO-8601 standard based on the first Thursday of the year.

## Popular tasks

- [What Week Number Is It?](https://pockettoolbox.org/en/what-week-number-is-it)

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PocketToolbox (https://pockettoolbox.org/en)