Week Number Finder
Look up the week number used in project plans, payroll and reports.
Runs in your browser. Nothing is uploaded Free, no sign-up Works on mobile
Pick a date.
How to use Week Number Finder
- Pick a date (today by default).
- Read the ISO week number and the week’s date range.
Frequently asked questions
How are ISO week numbers counted?
Weeks start on Monday, and week 1 is the week with the year’s first Thursday. Some years therefore have 53 weeks.
Why does my calendar show a different week number?
Some US calendars start weeks on Sunday and count from 1 January. Both numbers are shown.
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