A regular year has 52 weeks plus 1 day. A leap year has 52 weeks plus 2 days. A year is never a whole number of weeks — which is exactly why your birthday lands on a new weekday every year.
The simple math
A common year is 365 days. Divide by 7 and you get 52.14 — that is 52 full weeks and 1 leftover day. A leap year adds 29 February, making 366 days, or 52 weeks and 2 days.
| Year type | Days | Weeks | Extra days |
|---|---|---|---|
| Common year | 365 | 52 | 1 |
| Leap year | 366 | 52 | 2 |
How many weeks in 2026?
2026 is a common year, so it has 52 weeks and 1 day, running from Thursday 1 January to Thursday 31 December. See the full 2026 calendar, or open the live calendar for any country.
ISO weeks: why some years have 53
The ISO 8601 week numbering used across business and most of Europe sometimes counts 53 weeks. A year gets 53 ISO weeks when it begins on a Thursday (or a Wednesday in a leap year). You can look up the week number for any date with the week numbers tool.
What about weeks in a month?
A month is not a clean number of weeks either — most months are 4 weeks plus 2 or 3 days. We break that down in how many weeks are in a month.
FAQ
Are there always 52 weeks in a year? By the simple count, yes — 52 weeks plus 1–2 days. By ISO numbering, a year can show 52 or 53 numbered weeks.
How many weekends in a year? 52 — one per week — with a 53rd Saturday or Sunday in some years, depending on the starting weekday.