A week is a unit of time that has 7 days. There are approximately 52 weeks in a year.
Days in a Year
The definition of a year is the amount of time it takes our planet, Earth, to make one revolution around the Sun.
A day is the time it takes the Earth to make one rotation on its axis.
Earth rotates on its axis about 365.2422 times a year.
In the Gregorian calendar (introduced in October 1582), the days in a year were shortened to 365 days. Then, every leap year it plays “catch up” by having an extra day in February.
Exact Weeks in a Year
Because there are 365 days in a normal year, there are actually 52.1 weeks in a year, or 52 weeks + a day.
365 Days (per year) ÷ 7 Days (per week) = 52.1428571429 Weeks in a year
A leap year has 366 days, which is equal to 52.3 weeks, or 52 weeks + 2 days.
Weeks in Every Year
Every year has 52 weeks + 1 day, except leap years that have 52 weeks + 2 days.
| Year | Leapyear? | Days in year | Weeks in year |
|---|---|---|---|
| 2019 | No | 365 | 52 weeks + 1 day |
| 2020 | Yes | 366 | 52 weeks + 2 days |
| 2021 | No | 365 | 52 weeks + 1 day |
| 2022 | No | 365 | 52 weeks + 1 day |
| 2023 | No | 365 | 52 weeks + 1 day |
| 2024 | Yes | 366 | 52 weeks + 2 days |
| 2025 | No | 365 | 52 weeks + 1 day |
| 2026 | No | 365 | 52 weeks + 1 day |
| 2027 | No | 365 | 52 weeks + 1 day |
| 2028 | Yes | 366 | 52 weeks + 2 days |
Weeks in a Month
Every month with 31 days has 4.4 weeks (4 weeks + 3 days).
Months with 30 days have 4.3 weeks (4 weeks + 2 days).
February is the shortest month with 28 days that equals exactly 44 weeks. However, in a leap year, it has 29 days and 4.1 weeks (4 weeks + 1 day).
| Month | Days in month | Weeks in month |
|---|---|---|
| January | 31 | 4.4 weeks (4 weeks + 3 days) |
| February | 28; 29 in leap year | 4 weeks; 4.1 weeks (4 weeks + 1 day) |
| March | 31 | 4.4 weeks (4 weeks + 3 days) |
| April | 30 | 4.3 weeks (4 weeks + 2 days) |
| May | 31 | 4.4 weeks (4 weeks + 3 days) |
| June | 30 | 4.3 weeks (4 weeks + 2 days) |
| July | 31 | 4.4 weeks (4 weeks + 3 days) |
| August | 31 | 4.4 weeks (4 weeks + 3 days) |
| September | 30 | 4.3 weeks (4 weeks + 2 days) |
| October | 31 | 4.4 weeks (4 weeks + 3 days) |
| November | 30 | 4.3 weeks (4 weeks + 2 days) |
| December | 31 | 4.4 weeks (4 weeks + 3 days) |