The week number tells you where a date falls in the year, from week 1 to week 52 or 53. This tool works out the week number for any date, using the ISO system that most Indian offices, banks and payroll teams follow.
How to find the week number
- Pick a date in the box above, or leave it on today’s date.
- Choose ISO week if your office or bank uses that system; otherwise use the plain calendar week.
- Read off the week number, along with how many weeks, working days and pay periods the year has.
When this comes in handy
- Filling in a timesheet, leave form or attendance sheet that asks for the week number instead of a date.
- Working out a delivery, invoice or contract deadline that’s counted in weeks from today.
- Planning a school term, exam schedule or fitness programme that’s organised by week.
- Matching a payroll or reporting cycle that runs on ISO week numbers.
What the week number calculator shows
Type in any date and the tool returns its week number, plus the year’s total weeks, working days and common pay periods — weekly, fortnightly and four-weekly. It follows the ISO 8601 rule, where week 1 holds the year’s first Thursday and every week runs Monday to Sunday, the system most Indian offices, banks and payroll teams use.
Limits and tips
Some calendars start the week on Sunday instead of Monday, which can shift the number by one near the start of a week — check which system a form expects if the figure looks off. The tool runs on our own servers, needs no account and adds no watermark; since this is a simple date lookup, nothing is uploaded or stored.
Questions people ask
What week is it right now?
Open the box above without changing the date and it shows today’s week number straight away, based on the ISO calendar.
What week of the year is it?
It depends on today’s date. The tool counts from 1 January using full Monday-to-Sunday weeks, so the number moves up by one every Monday.
What is an ISO week?
An ISO week is a Monday-to-Sunday week numbered under the ISO 8601 standard, where week 1 is the week that holds the year’s first Thursday. It’s the version most offices and payroll systems in India use.
What’s the week number today?
Enter today’s date, or leave the date field as it is, and the box above shows the current week number along with the year’s working days and pay periods.
How is the current week number calculated?
The tool counts complete Monday-to-Sunday weeks from the start of the year and adjusts for which week holds 1 January and the first Thursday, as ISO 8601 requires.
Do week numbers differ between countries?
Yes. Some countries start the week on Sunday and number it differently, so a date can show as week 12 under ISO rules and week 13 under a Sunday-start calendar. Check which system the form or software you are using expects.
Updated 24 September 2026.