How Many Weeks In A Year?


Have you ever noticed the number of weeks in a year planner? It’s important to know this number so you can plan your weeks and the year accordingly. 


So how many weeks are in a year? The simple answer is approximately 52 weeks. But if you multiply 52 by 7, you’ll get the answer 364. The more accurate answer is 52.1428 weeks or 365.24 days.  We all know we have 365 days in a common year, so we need to add 1 extra day once every 4 years to make up the difference. The year with an extra day is called a leap year.

Weeks in A Year Table

YearNumber of weeksNumber of daysLeap year?
201952 weeks and 1 day365no
202052 weeks and 2 days366yes
202152 weeks and 1 day365no
202252 weeks and 1 day365no
202352 weeks and 1 day365no
202452 weeks and 2 days366yes
202552 weeks and 1 day365no
2026 52 weeks and 1 day365no
202752 weeks and 1 day365no
202852 weeks and 2 days366yes
202952 weeks and 1 day365no
2030 52 weeks and 1 day365no
203152 weeks and 1 day 365 no
203252 weeks and 2 days 366yes

The answer sounds simple, but a deeper dive is worth looking to discover the reason behind it and how everything got started.

What’s The Difference Between Common Year And Leap Year? 

According to the Gregorian Calendar, there are 365 days in a common year and 366 days in a leap year. A common year is a calendar year with 365 days, divided into 12 months with irregular lengths. 11 of the months have either 30 or 31 days, while February has only 28 days. Common years are called “common” for a reason. About 75% of the time, we have a common year. Out of every 100 years in the Gregorian calendar, 75 years are common years.


The rest 25 years have an intercalary day (also called the leap year day) making them 366 days long. Leap years happen nearly every four years. The extra day is added on 29 February. These leap year rules were introduced in 1582 by the Gregorian Calendar, named after Pope Gregory XIII.


What’s the Gregorian Calendar?


The Gregorian calendar, also known as the Western or Christian calendar,  is the most widely used calendar in most of the world today. In the Gregorian calendar, the days of the year are divided into 7-day weeks, and the weeks are numbered 1 to 52 or 53.


Most countries start the week on Monday. However, some countries, such as the US, Canada, Brazil, and Japan, count Sunday as the first day of the week. If you buy a calendar book in these countries, you will see Sunday as the start of the week. Sunday was traditionally regarded as the first day of the week by both Christians and Jews. Under the Jewish calendar, Saturday was the last day of the week and considered the Sabbath. The Christians started worshiping on the first day of the week. 


Why Leap Year Existed?

One year is the time it takes for the earth to go around the sun. A leap year is designed to help synchronize the calendar year with the solar year, or the length of time it takes the earth to complete its orbit around the sun, which is about 365¼ days. However, the length of the solar year is slightly less than 365¼ days by about 11 minutes. To compensate for this discrepancy, the leap year is omitted three times every four hundred years. 

It takes Earth approximately 365.242189 days, or 365 days, 5 hours, 48 minutes, and 45 seconds, to circle once around the Sun. If we use our modern-day Gregorian calendar, which is 365 days a year, we’ll begin every year 6 hours before the Earth completes its orbit around the sun. The difference might seem negligible, but over decades and centuries that missing quarter of a day per year can add up.


To fix this issue, over 2000 years ago, Roman General Julius Caesar introduced the idea of leap years. During his time in Egypt, Caesar witnessed the superiority of the Egyptian solar calendar. Whenever the Egyptian astronomers observed the correct conditions in the stars, an occasional intercalary month was inserted to the 365 days calendar year. Caesar and the philosopher Sosigenes of Alexandria simplified the rule to make it easier to follow: instead of relying on the stars, they would simply add a day to every fourth year.

https://youtu.be/xX96xng7sAE


But wait, why is February? 

In the earliest version of the Roman Calendar, the year started in March and ended in December, which means a year would only be 304 days. Most of the winter months were not numbered or named. Around 650 B.C.E. or so, the Roman King Numa Pompilius had introduced February and January (in that order) between December and March, then making a year 354 or 355 days. In 450 B.C.E., February was moved to its current position between January and March. Still, March was considered the first month of the year, therefore, February as the last month. It’s reasonable to make any occasional necessary corrections(i.e. adding leap days) were performed before the beginning of each year, which is February.


Weeks in A Month Table

#Month
Days/MonthWeeks/Month
1January31 days4 weeks + 3 days
2February28 days (common year)
29 days (leap year)
4 weeks
4 weeks + 1 day
3March31 days4 weeks + 3 days
4April30 days4 weeks + 2 days
5May31 days4 weeks + 3 days
6June30 days4 weeks + 2 days
7July31 days4 weeks + 3 days
8August31 days4 weeks + 3 days
9September30 days4 weeks + 2 days
10October31 days4 weeks + 3 days
11November30 days4 weeks + 2 days
12December31 days4 weeks + 3 days

* Leap year = 2020 / 2024 /2028 /2032 …

* If you sum up the total weeks in the table above, you’ll get 52 weeks plus 1 day for a common year and 52 weeks plus 2 days for a leap year. 

*Most leap years can be evenly divisible by 4. But century years are not leap years unless they can be evenly divided by 400. 

Related Questions:

1. How many weeks is an average month?

Months have different lengths, varying from 28 days to 31 days. If the month has 28 days, it has 4 weeks. If it has 29 days, it has 4 weeks plus 1 day. If it has 30 days, it has 4 weeks plus 2 days. If it has 31 days, it has 4 weeks plus 3 days. However, you should be careful when counting how many paychecks you should expect for the particular month. It’s not necessarily true that you will only get 2 paychecks every month if you are paid bi-weekly. For example, if you are paid every other Friday, in one month, you may have an extra Friday falling at the beginning or end of the month. That makes a total of 3 paychecks for that month.

2. How do you calculate your weekly salary?

If your employer compensates you on a salary basis, you need to know the total of hours worked and the salary amount. Most full-time employees work 40 hours per week and 52 weeks per year, making the total hours worked per year  2,080 hours. Now divide the annual salary by 52 to get the weekly salary and divide by 2,080 to get an hourly rate. For example, if the annual salary is $45,000, the weekly salary would be $45,000/52=$865, and the hourly rate would be $45,000/2,080=$21.63.  

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