Toolipedia- Free
- No sign-up
- Works on any device
No tool matches your search.
- Free
- No sign-up
- Works on any device
Create a QR code for a link, Wi-Fi, WhatsApp, contact and more, or read one from a photo.
- Free
- No sign-up
- Works on any device
Fill in the details to see your QR code.
PNG for phones, chats and websites. SVG and PDF stay sharp at any size, which is best for printing. Tip: point your phone camera at the preview to test it.
3. Style (optional): colors, dots, logo
Choose a photo or screenshot or drag it here
Works with photos of printed codes, screenshots and image files.
Looking for QR codes…
Week number calculator
The ISO week number, day of the year and quarter for any date.
- Free
- No sign-up
- Works on any device
About Week number calculator
Find the ISO 8601 week number of any date, along with its day of the year and quarter. ISO weeks start on Monday, and week 1 is the one containing the first Thursday of the year. Because of that, early January days can belong to week 52 or 53 of the previous year.
How to use Week number calculator
- Pick any date.
- Read the ISO week number shown for it.
- Check the day of the year and quarter listed below.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Free to embed on your own website, with a ready-made code to copy.
- Available in 10 languages.
Also known as
Frequently asked questions
Why is 1 January sometimes in week 52 or 53?
ISO week 1 contains the year's first Thursday. If January 1 falls on Friday to Sunday, it still belongs to the last week of the previous year.
Which day does an ISO week start on?
ISO weeks start on Monday, and week 1 is the week with the first Thursday of the year. Some countries and apps start weeks on Sunday and number them differently.
Why does my calendar show a different week number?
Calendars in the US and some other places count week 1 as the week with 1 January and start on Sunday. This tool uses the ISO standard, so numbers can differ by one.
Is Week number calculator free?
Yes. Week number calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.
Can I put Week number calculator on my own website?
Yes. Use the Embed on your site button under the tool to copy a short piece of code and paste it into your page. It is free, needs no account, and the tool keeps working inside your page.