What Week Is It? Week 45
What week of the year is it?
What Week Is It Right Now?
Today is Monday, November 2, 2026: it is week 45 of 2026 (November 2, 2026 – November 8, 2026). 2026 has 53 ISO weeks, so 8 weeks remain.
Week Number — What Week Is It Right Now?
Today's week number and the ISO week of any date
Find out what week of the year it is — instantly. The tool opens with today's week number and lets you check the calendar week of any date: the ISO 8601 week (the standard used across Europe and in business), the week's Monday-to-Sunday date range, how many weeks the year has in total (52 or 53) and how many are left. Handy for sprint planning, invoicing by calendar week, pregnancy week tracking against a calendar, school schedules and logistics. Everything runs free in your browser.
Features
Today by Default
Opens with the current week number — zero clicks needed
ISO 8601 Standard
Weeks start Monday; week 1 contains the year's first Thursday
Week Range
See each week's exact Monday–Sunday date range
52 or 53?
Shows the year's total weeks and how many remain
How ISO Weeks Work
The rules
- Weeks run Monday to Sunday
- Week 1 is the week with the year's first Thursday
- Equivalent: the week containing January 4
- A year has 52 or 53 ISO weeks
Who uses week numbers
- Business planning and invoicing (calendar weeks)
- Sprint and project scheduling
- Manufacturing and logistics timetables
- School and university calendars
Frequently Asked Questions
What week is it right now?
The tool shows the current ISO week number as soon as it opens — along with the week's Monday–Sunday range and how many weeks are left in the year.
How is the week number calculated?
By the ISO 8601 standard: weeks start on Monday, and week 1 is the week containing the year's first Thursday (equivalently, January 4).
Why do some years have 53 weeks?
A year has 53 ISO weeks when it starts on a Thursday — or on a Wednesday in a leap year. Otherwise it has 52.
Can early January belong to last year's week 52/53?
Yes. If January 1 falls Friday–Sunday, those days belong to the previous ISO year's final week — that's why the ISO week-year can differ from the calendar year.
Is it free, and does it work on my phone?
Yes. It's completely free with no sign-up and works in your browser on desktop, tablet and phone.