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Week Number Calculator
Check the week number for any date, or find start and end dates of any week number. Includes a visual week calendar table.
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Weeks of Year 2026
| Week Number | Starts (Monday) | Ends (Sunday) |
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Calendar Week Numbers Made Simple
Week numbers are standard references in project management, retail planning, logistics schedules, and payroll systems (e.g. bi-weekly payments). The ISO-8601 week number system designates Monday as the first day of the week, with Week 1 of any year containing the first Thursday of that year.
Use our interactive calculator to easily look up any date or view a full breakdown table of week dates for the current year.
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This tool automatically calculates and loads the current week number based on today's calendar date.
A year has either 52 or 53 weeks depending on the calendar alignment and whether it's a leap year.