Calendar Week Calculator
Show current calendar week (CW) and convert date to calendar week.
Current Week Number
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Calculation based on ISO-8601 standard.
Popular uses
How does this tool work?
Quickly determine the current calendar week or convert any date into a week number.
The tool instantly shows you today's calendar week. Use the date field to select a specific day to determine its CW number according to the ISO-8601 standard. This is particularly helpful for scheduling and project coordination.
Where are my data processed?
Only in your browser. Your data is not sent to any server.
The tool calculates and converts with JavaScript right on your device. Input and files are not sent to us or anyone else. You can check this yourself: load the page, disconnect from the internet, and the tool keeps working in the open tab.
No Server UploadNo sign-upRuns Offline in Tab