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How Many Weeks in a Year

One day almost everyone wonders how many weeks there are in a year. The answer seems to be obvious because it is elementary mathematics. You can count them by dividing 365 days per year by seven days per week. This way we’ll get 52 weeks plus one day. If it is one of the leap years1 with 366 days, it has 52 weeks plus two extra days. In other words, one can say that a regular year contains 52 1/7 weeks and a leap year consists of 52 2/7 weeks.

Or Are There 53 Weeks in a Year?

The days on the calendar will be arranged in 53 weeks, at least one of which will have less than 7 days. In the rarest of cases, the calendar can overlap 54 weeks in one year : January 1 and December 31 in their own separate weeks.


From the point of view of mathematics, there are 52 1/7 (or 2/7) weeks in a year. It means 52 full weeks. But on the calendar there will be 53 or 54 separate weeks though one or two of them will be incomplete. So the answer to the question about the number of weeks in a year depends on what you prefer to call a week.

If you mean seven days from Sunday till Saturday, then no year will have more than 52 weeks. But if a week for you is a separate line or column in the calendar, then there may be up to 54 weeks in a year.
Perhaps even more fundamentally there appear to be about 52.18 weeks (365 days, 5 hours, 48 minutes 45.19 seconds) in a mean solar or tropical year. However, note that this value is changing based on the changes to the Earth’s path around the sun.
The Gregorian year, which is the internationally accepted civil year based on the Julian year, averages only 52.1775 solar weeks.
52, all the time on our current calendar.Actually it is 52.142857 in a non leap year and 52.285714 in a leap year. Divide days by 7.

Sources: a b

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