How Many Weeks In a a Common Year and Leap Year?
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| Photo: Getty Images |
How Many Weeks Are There In a Year
A normal year in the 'modern' calendar has 365 days, which, when divided by 7 (Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday) equals 52.1428571 weeks.
Every four years, there is a leap year*, adding an extra day into the calendar (pity those 17 year olds born on February 29th 2000, who have only had 4 true birthdays). In this case, the calculation is 366 divided by 7, which equals 52.2857, so it's still just 52 weeks.
This is all based upon the Gregorian calendar (introduced back in 1582), which cycles every 400 years. If you want to go a step further and work out the average number of weeks in a year across the full Gregorian calendar, you'll find that a year works out at 365.2425 days. When divided by 7 it gives you a total of 52.1775 weeks.
Weeks in a Common Year
One calendar common year has 365 days:
1 common year = 365 days = (365 days) / (7 days/week) = 52.143 weeks = 52 weeks + 1 day
Weeks in a Leap Year
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| Photo: Getty Images |
One calendar leap year occures every 4 years, except for years that are divisable by 100 and not divisable by 400.
One calendar leap year has 366 days, when February has 29 days:
1 leap year = 366 days = (366 days) / (7 days/week) = 52.286 weeks = 52 weeks + 2 days
Facts About Weeks
• The Gregorian calendar is based on the phases of the moon, so a week has seven days.The Moon goes through its phases every 29.5 days, but that's not a good way to measure time.
• This cycle was rounded to 28 days by the Babylonians, who split it into 4 units of 4 days each. That's why a month has 4 weeks.
• In English, Saturday, Sunday, and Monday are named after Saturn, the Sun, and the Moon, which are all planets that people thought were gods. The other days are named after Germanic or Norse gods.
• To most people around the world, the week begins on Monday. But in the United States, Sunday is still considered the first day of the week.
Summary of Years
| Year type | Number of days | Number of weeks | Comments |
|---|---|---|---|
| Lunar | 354.37 | 50.6242857 | Muslim calendar year |
| Common year | 365 | 52.1428571 | |
| Gregorian (average) | 365.2425 | 52.1775 | |
| Julian | 365.25 | 52.1785714 | used in astronomy (computing the distance covered by a light-year, etc) |
| Leap year | 366 | 52.2857143 |
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Here's a table to show you how common years from the Gregorian calendar are broken down into weeks and days:
Weeks in a year table
| Year | Number of weeks | Number of days | Leap year? |
|---|---|---|---|
| 2015 | 52 weeks and 1 day | 365 | - |
| 2016 | 52 weeks and 2 days | 366 | yes |
| 2017 | 52 weeks and 1 day | 365 | - |
| 2018 | 52 weeks and 1 day | 365 | - |
| 2019 | 52 weeks and 1 day | 365 | - |
| 2020 | 52 weeks and 2 days | 366 | yes |
| 2021 | 52 weeks and 1 day | 365 | - |
| 2022 | 52 weeks and 1 day | 365 | - |
| 2023 | 52 weeks and 1 day | 365 | - |
| 2024 | 52 weeks and 2 days | 366 | yes |
| 2025 | 52 weeks and 1 day | 365 | - |
If you're using a fancy academic journal or office wall planner, the "52 weeks" rule doesn't always apply. Sometimes, they number the weeks based on whether they run from Sunday to Saturday or Monday to Sunday, which means that the first and last weeks of the year are split up to fit this pattern.
Even though there are still 52 weeks in a year and time doesn't magically slow down, that kind of calendar might count the weeks as high as 54 because of how it counts the pieces at the beginning and end of the year.
E.g.:
WEEK 1: Thursday 1 January, Friday 2 January, Saturday 3 January, Sunday 4 January
WEEK 2: Monday 5 January, Tuesday 6 January...
An extra note about leap years...Leap years are used to fix a small mistake in our yearly calendars. It takes Earth 365 days, 5 hours, and 48 minutes to go around the sun once. To keep the calendar correct, we add an extra day every four years to make up for the extra time. If we didn't, we would be off by 24 more days every century. There are three ways to tell if a year is a leap year. Julius Caesar came up with the idea 2,000 years ago. He said that any year that could be easily divided by 4 was a leap year. But this made too many leap years and still threw off the timing, so here is a list of three things that every leap year should have... Leap year checklist The number of the year can be divided by 4 If the year can be divided by 100, then it's NOT a leap year, except... If it can also be divided by 400, in which case, OK, it's a leap year. |
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