Wondering what week number it is today or which week a specific date falls into?
Our Week Number Calculator makes it simple. Enter any date, and the tool instantly shows:
This calculator works with the ISO-8601 standard used worldwide for schedules, business reporting, and calendars.
A week number is the numerical order of a week in a year.
For example:
Week numbers make it easy to manage projects, plan work schedules, and align with international calendar standards.
The ISO-8601 week date system defines:
This ensures week numbers are consistent worldwide.
Q: What week is it today?
Check the top of this page – the calculator shows the current ISO week number for today’s date.
Q: How do I find the week number of a date?
Enter your chosen date into the calculator, and it will return the correct ISO week number, week-year, and week range.
Q: How many weeks are in a year?
Most years have 52 weeks, but some have 53 weeks depending on the calendar.
Q: Does this calculator use ISO week numbering?
Yes, it uses the ISO-8601 international standard (Monday–Sunday week).