Units of Measure / How Many Weeks in a Year

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?

These extra days (one or two) make one more week though it is incomplete. It means that on the calendar all the days in a year are arranged in 53 weeks, and one or two of them have less than seven days.

What is more, in rare cases the calendar can get even 54 weeks. This situation happens in every 28 years when the 1st of January and the 31st of December form separate weeks. Of course, it must be a leap year.

For example, the year of 2000 had 54 weeks. Its first week consisted of only one day which was Saturday, the 1st of January. And the last week of 2000 included just one day too. It was Sunday, the 31st of December.


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.
  1. Leap year – is a year that occurs once every 4 years. It consists of 366 days, and the intercalary day is always the 29th of February.
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