Week Number Calendar
See today's ISO week number, browse past and future months, select any week, add a weekly note and share your plan on WhatsApp.
Today's ISO week is highlighted in green so you can find the current week instantly.
Move month by month with the left and right arrows or jump directly to any month and year.
Select a day, save a note for its week and share the plan through WhatsApp whenever you need it.
Free Week Number Calendar & ISO Week Planner
This free Week Number Calendar is a simple online tool for checking ISO week numbers and planning work by week. It uses the ISO 8601 week system, where weeks begin on Monday and ISO week 1 is the week containing the first Thursday of the year.
The monthly calendar makes it easy to see dates and their week numbers at a glance. Today's week is shown with green tones, while the week you select is highlighted separately.
What can you use a week number for?
- Check the current ISO week number quickly.
- Find week numbers for previous and future months and years.
- Plan work schedules, shifts, deadlines and appointments by week.
- Add a note to a selected week and keep it stored in your browser.
- Share a weekly plan or reminder through WhatsApp.
How to use the Week Number Calendar
- Use the left and right arrows to move to the previous or next month.
- Choose a month and year to jump directly to another date.
- Click any day to select its ISO week.
- Write your work days, reminders, deadlines or other information in the Weekly Note box.
- Click Save Note to store the note in your browser.
- Use Share on WhatsApp to send the selected week and note.
Use the Pro Weekly Calendar to organize weekly commitments and track working days and notes more comfortably.
Week Number Calculator
If you only need to calculate the week number for a specific date, use the Week Number Calculator. It is useful when you want a quick ISO week result without browsing the calendar.
Frequently Asked Questions
What is an ISO week number?
An ISO week number identifies a week using the ISO 8601 calendar system. The week starts on Monday, and ISO week 1 is the week containing the first Thursday of the year.
Can I view past and future months?
Yes. Use the previous and next month arrows, or choose a month and year. You can browse dates and ISO week numbers across past and future years.
Can I add a note to a week?
Yes. Click any day in the week, write your note and save it. Saved notes remain in your browser and are marked with a green dot.
Can I share a note on WhatsApp?
Yes. The WhatsApp button creates a ready-to-share message containing the selected week, date range and your note.
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