# What Week Number Is It?

> The current week number at a glance, counted according to ISO 8601. Plus the week number for any other date.

The current week number is at the top. It is counted according to ISO 8601, as is common in most of Europe and in Outlook and most calendars. For another date, look it up below.

- Open in browser: https://pockettoolbox.org/en/what-week-number-is-it
- Tool: [Calendar Week Calculator](https://pockettoolbox.org/en/calendar-week)
- Runs entirely in your browser; files and input are never uploaded.

## How it works

1. Read the current week at the top.
2. For another date, pick it in the field.
3. Click calculate.

## FAQ

### How are week numbers counted?

The week starts on Monday. Week 1 is the week containing the first Thursday of the year, so the first days of January can still belong to the last week of the previous year.

### Does every year have 52 weeks?

No. A year that starts on a Thursday, or a leap year that starts on a Wednesday, has 53 weeks.

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