Week Number to Date Range Converter (ISO Week)

Calculate the starting Monday and ending Sunday calendar dates for any given ISO 8601 week number and year.

How It Works & Processing Standards

Calculate the starting Monday and ending Sunday calendar dates for any given ISO 8601 week number and year.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Maximum input length: 100,000 characters

Week Number to Date Range Converter (ISO Week) is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use Week Number to Date Range Converter (ISO Week)

  1. 1
    Enter YearInput calendar year (e.g. 2026).
  2. 2
    Enter Week NumberInput ISO week number (1-53).
  3. 3
    View Date SpanRead the starting Monday and ending Sunday dates.

Common Use Cases

  • Generating weekly sprint reports, aligning supplier delivery schedules, and payroll processing
Have feedback or ideas for this tool? Suggest & Inquire →