# What week is it?

URL: https://gocutline.com/tools/week-number/

The current week number is shown at the top of this page and updates to today in your time zone. Week numbers follow ISO 8601: weeks start on Monday, and week 1 is the week that contains the year's first Thursday.

## How week numbers work
- **Weeks start on Monday** and end on Sunday.
- **Week 1** is the week with the first Thursday of the year in it (the same as the week that contains January 4).
- A year has **52 or 53 weeks**. 2026 has 53; 2027 has 52.
- Some countries and apps (the US in particular) count weeks from Sunday or from January 1. This page uses the ISO standard used across Europe and in most business software.

## Week numbers in Cutline
Every week in Cutline shows its ISO week number on top of the Grid, next to the dates. Planning by week number makes it easy to say "launch in week 47" and see it coming.

## All week numbers
- [Week numbers 2026](https://gocutline.com/tools/week-numbers-2026/)
- [Week numbers 2027](https://gocutline.com/tools/week-numbers-2027/)

## Questions

**What week of the year is it?**
See the top of this page: it updates to today's ISO week number in your time zone.

**Do week numbers start on Sunday or Monday?**
In the ISO 8601 standard, Monday. Calendars in the US often start the week on Sunday, which can shift the number by one around the start of the year.

**Can a year have 53 weeks?**
Yes. A year has 53 ISO weeks if it starts on a Thursday, or is a leap year that starts on a Wednesday.

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Cutline: Cutline is a weekly calendar and planner that turns time blocks into XP, levels and streaks. You plan your week in blocks, tick each one off when it is done, and see your progress on a social feed (the Floor) and a weekly leaderboard (the Arena). Planning and budgeting are free; paid plans add a badge, posting, messaging, shared calendars and lower selling fees, from $9 a month. Pro is free to try for 7 days.
Facts: https://gocutline.com/facts/ · Updated 2026-10-24