Time & Date

Week Number Calculator

Lets users convert and compute week number instantly with formula, steps and examples — no manual math.

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ISO week number
29

2026-07-14 falls in ISO week 29 of 2026.

ISO year
2,026

About this calculator

The ISO-8601 week number (1–53). Weeks start on Monday, and week 1 is the week containing the year's first Thursday.

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