What Week Is It? Current Week Number
Find the ISO 8601 week number, week-based year, and Monday-to-Sunday range for any date.
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This page opens the week calculator on today's date, so the answer to "what week is it" is on screen the moment the page loads.
Week numbers follow the ISO 8601 standard used across Europe in logistics, payroll and project planning: weeks start on Monday, and week 1 is the one containing the first Thursday of the year — which is why early January dates can still belong to week 52 or 53 of the previous week-year.
The full calculator also takes any other date, shows its week-year and the exact Monday-to-Sunday range, and runs entirely in your browser.