What week number is it?
Today's ISO week number at a glance – plus the week of any date and all weeks of a year.
- Stays on your device
- No limits
- No watermark
- No account
How can I check that nothing is uploaded?
Your files are processed in this browser tab. This page has no function that sends files to a server, and its security rules (Content Security Policy) forbid connections to other servers.
Check it yourself: load this page, then switch on flight mode or disconnect Wi-Fi and run the tool. It still works – because everything happens on your device.
Good to know
How it works – step by step
Read today's week
Today's week number appears at the top with its Monday and Sunday.
Enter a date or a week
Choose a date to see its week, or enter week and year to get the dates.
Print the overview
All weeks of a year are listed below. “Calendar weeks as PDF” gives you a printable page.
Why FaLe?
ISO 8601
Weeks start on Monday and week 1 contains the year's first Thursday – the European standard.
Week 53 handled
Some years have 53 weeks, and 1 January can belong to the previous year's week – shown correctly.
Printable
The overview of all calendar weeks of a year comes as a one-page PDF.
| FaLe Tools | Typical online tools | |
|---|---|---|
| Where are files processed? | In your browser, on your device | Usually on the provider’s server – the file is uploaded |
| Account needed? | No | Often for larger files or more runs |
| Limits | No artificial limits | Often daily limits or size caps in the free version |
| Watermark | Never | With some providers in the free version |
| Works offline | Yes, after the first visit | No |
| Ads and tracking | None | Often banner ads and analytics services |
Frequently asked questions
How is the ISO week number calculated?
Weeks start on Monday and week 1 is the week with the year's first Thursday – the week containing 4 January.
Why can 1 January be in week 53?
If 1 January falls on a Friday, Saturday or Sunday it still belongs to the last week of the previous year.
How many weeks does a year have?
52 or 53. A year has 53 weeks if it starts on a Thursday – or, in a leap year, on a Wednesday.
Does this match US week numbers?
Not always. US calendars often start weeks on Sunday and count differently; this calculator uses the ISO standard.
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More features in the FaLe PDF app
Sign, fill in forms, scan with text recognition and more than 40 other tools – free, no account and offline, too.