How many weeks are in 2025?

2025 has 52 ISO weeks. The year has 365 days (not a leap year). January 1, 2025 falls on a Wednesday.

Does 2025 have 53 weeks?

No — 2025 has 52 ISO weeks. A year has 53 weeks only when December 31 falls in ISO week 53, which typically happens every 5–6 years (most recently or next occurring in a nearby year with 53 weeks).

When does week 1 of 2025 start?

ISO Week 1 of 2025 starts on December 30, 2024. ISO week 1 is defined as the week containing the first Thursday of the year, which always starts on a Monday.

How many working weeks in 2025?

2025 has approximately 50 working weeks. This estimate accounts for about 2 weeks of public holidays and standard vacation time in the US. The exact count varies by country, employer, and individual holiday schedule.

← All Years

Calendar

How Many Weeks in 2025? — 52 Weeks

365 days | January 1 is a Wednesday | Not a leap year

2025 at a Glance

ISO Weeks

Total Days

365

Working Weeks

~50

Leap Year

ISO Week 1 of 2025

ISO Week 1 of 2025 starts on December 30, 2024.

How ISO week 1 is defined:

ISO week 1 is the week containing the first Thursday of the year.
ISO weeks always start on Monday.
A year has 53 weeks if December 31 falls in ISO week 53 (not week 1 of the next year).
This happens in years where Jan 1 is a Thursday (or a Wednesday in leap years).

Weeks per Year — 2024 to 2030

ISO week count for each year in the range.

Year	ISO Weeks	Leap Year	Jan 1 Day
2024	52	Yes	Monday
2025← you	52	No	Wednesday
2026	5353!	No	Thursday
2027	52	No	Friday
2028	52	Yes	Saturday
2029	52	No	Monday
2030	52	No	Tuesday

Frequently Asked Questions — 2025

How many weeks are in 2025?: 2025 has 52 ISO weeks. The year has 365 days (not a leap year). January 1, 2025 falls on a Wednesday.
Does 2025 have 53 weeks?: No — 2025 has 52 ISO weeks. A year has 53 weeks only when December 31 falls in ISO week 53, which typically happens every 5–6 years (most recently or next occurring in a nearby year with 53 weeks).
When does week 1 of 2025 start?: ISO Week 1 of 2025 starts on December 30, 2024. ISO week 1 is defined as the week containing the first Thursday of the year, which always starts on a Monday.
How many working weeks in 2025?: 2025 has approximately 50 working weeks. This estimate accounts for about 2 weeks of public holidays and standard vacation time in the US. The exact count varies by country, employer, and individual holiday schedule.

Loading Legacy