Weeks Left in the Year
See how many full weeks and days remain until December 31. Change the date below if you want the count from a day other than today.
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How to use this calculator
Leave the date as today for a live answer, or pick another day if you are planning ahead. The result shows full weeks left until December 31 of that year, plus any leftover days that do not make another full week. You also get day-of-year progress and the current week number in both ISO and US styles.
How remaining weeks are counted
First, count the calendar days from your chosen date through December 31 (including that end date as a remaining day when it has not yet arrived). Then divide by 7. The whole number is full weeks left; the remainder is extra days.
That is different from subtracting “current week number” from 52. Week-number methods depend on whether the week starts on Monday (ISO) or Sunday (common in the US), and they can disagree near year boundaries. Day-based counting answers “how much calendar time is left” more directly.
Frequently asked questions
How many weeks are left in the year?
Use the result above. It updates from the date you enter and always measures through December 31 of that same year.
Does a leap year change the answer?
Yes. A leap year has 366 days, so from the same month and day you usually have one extra day left compared with a common year (after February 29 has passed, or when counting from before it).
What is the difference between ISO week and US week?
ISO 8601 weeks start on Monday. Many US calendars start the week on Sunday. Both week numbers are shown so you can match the system your workplace or school uses.
How do I calculate this in Excel or Google Sheets?
Days left through year-end: =DATE(YEAR(TODAY()),12,31)-TODAY(). Full weeks: =INT((DATE(YEAR(TODAY()),12,31)-TODAY())/7).