What Week Is It?
Find the week number for today or any date.
Quick answer: Pick a date to see its ISO week number, such as 2026-12-28 = week 53. Today's week is shown when the page opens. ISO weeks start on Monday and week 1 holds the first Thursday of the year.
Dates are worked out from your own device's calendar day. Nothing is sent anywhere.
How to use it
- Today's date is filled in, so you see the current week at once.
- Pick another date to find its week.
- The page shows the ISO week (Monday start) and the US week (Sunday start).
What people use it for
- Planning and scheduling
- Homework and school
- Work and deadlines
- Travel and events
- Curiosity
Questions
What week number is it now?
It is shown when you open the page. Change the date to check any other day.
How many weeks are in a year?
52 or 53 ISO weeks. 53 weeks happen in years where January 1 is a Thursday, or a leap year starting on a Wednesday.
What is the difference between ISO and US week numbers?
ISO weeks start on Monday and week 1 has the first Thursday. US-style weeks start on Sunday and week 1 contains January 1.
Is it free?
Yes. No sign-up, no install and no limit.
Is anything saved or sent?
No. Everything runs in your browser. Only your own best score, where a page shows one, is kept on your device.
Last updated 2026-10-24. Free to use, no sign-up. Made by ficklestudio26.