Week number
Find the week number of any date, with the full list of weeks for the year.
How it works
Week numbers follow the ISO 8601 standard used in Europe: weeks start on Monday, and week 1 is the one that contains the first Thursday of the year. Some years therefore have 53 weeks.
Frequently asked questions
Is this tool free?
Yes. It’s free to use, with no account and nothing to install.
Is my data private?
Yes. This tool works entirely on your device: nothing you enter or open is sent to a server.
Does it work on a phone?
Yes. It works in the browser of any recent phone, tablet or computer.