Most people count days and months. You? You’re about to start counting weeks like you’re planning a military operation or running a startup. This calculator tells you what week of the year any date falls into. Week 23. Week 41. Suddenly you sound more organized than you actually are.

What it does: Pick any date. The calculator tells you what week number it is (out of 52 weeks in a year). It also shows you what day of the year it is, when that week starts, when it ends, and what day of the week your date falls on. Basically everything except your horoscope.

Using it is instant:

Two quick action buttons right at the top. “Today” and “Tomorrow.” Click either one and boom, instant results. No typing required. Perfect for when you’re in a rush or just lazy. We don’t judge lazy here.

Or manually pick any date from the calendar field. The moment you select a date, hit “Find Week Number.” The calculator drops a giant number on your screen. That’s your week number. Below it, you get the full breakdown.

Week Number Calculator

📊 Week Number Calculator

Find out which week of the year any date falls into

Select Date

Week Number

of 52 weeks

Date –

Day of Week –

Day of Year –

Week Starts –

Week Ends –

The breakdown includes:

What week of the year it is (Week 43, for example). What day of the year it is (Day 301). The date in full format. What day of the week it is. When the week starts (Monday). When the week ends (Sunday). Everything you need to sound like you have your life together.

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Why anyone needs this:

You work in project management and someone asks “When are we launching?” Saying “Week 15” sounds way more professional than “sometime in April.” You’re planning a 52 week savings challenge and need to track which week you’re on. You run a content calendar and think in weekly chunks instead of random dates.

Confession time: Regular people don’t think in week numbers. But the moment you start, you can’t stop. “Meet me in Week 32” becomes normal. Your friends think you’re weird. You think you’re efficient. You’re both right.

The calculator loads with today’s date already calculated. So the second you open it, you know what week you’re in. No effort required. If you want to check another date, just change it and calculate again.