Week Number Converter
Enter a date to find the week number of the year, or enter a week number to see its date range.
Date to Week Number
—
Week Number to Dates
—
How to use
- Enter your values in the boxes above or select an option.
- The result updates live right away — no button needed.
- Change a value or unit and the new result shows on its own.
Note
ISO 8601 standard: the week starts on Monday, and the first week of the year is the one that has the first Thursday of the year. Some years have 53 weeks.