Week numbers 2025

2025 has 52 weeks. Week 1 starts on Monday, 30 December 2024 and week 52 ends on Sunday, 28 December 2025.

All week numbers of 2025 in one list, with the start and end date of every week.

All weeks of 2025

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Week numbers 2025 (ISO-8601)
WeekStart dateEnd date
1Wednesday, 1 January 2025Sunday, 5 January 2025
2Monday, 6 January 2025Sunday, 12 January 2025
3Monday, 13 January 2025Sunday, 19 January 2025
4Monday, 20 January 2025Sunday, 26 January 2025
5Monday, 27 January 2025Sunday, 2 February 2025
6Monday, 3 February 2025Sunday, 9 February 2025
7Monday, 10 February 2025Sunday, 16 February 2025
8Monday, 17 February 2025Sunday, 23 February 2025
9Monday, 24 February 2025Sunday, 2 March 2025
10Monday, 3 March 2025Sunday, 9 March 2025
11Monday, 10 March 2025Sunday, 16 March 2025
12Monday, 17 March 2025Sunday, 23 March 2025
13Monday, 24 March 2025Sunday, 30 March 2025
14Monday, 31 March 2025Sunday, 6 April 2025
15Monday, 7 April 2025Sunday, 13 April 2025
16Monday, 14 April 2025Sunday, 20 April 2025
17Monday, 21 April 2025Sunday, 27 April 2025
18Monday, 28 April 2025Sunday, 4 May 2025
19Monday, 5 May 2025Sunday, 11 May 2025
20Monday, 12 May 2025Sunday, 18 May 2025
21Monday, 19 May 2025Sunday, 25 May 2025
22Monday, 26 May 2025Sunday, 1 June 2025
23Monday, 2 June 2025Sunday, 8 June 2025
24Monday, 9 June 2025Sunday, 15 June 2025
25Monday, 16 June 2025Sunday, 22 June 2025
26Monday, 23 June 2025Sunday, 29 June 2025
27Monday, 30 June 2025Sunday, 6 July 2025
28Monday, 7 July 2025Sunday, 13 July 2025
29Monday, 14 July 2025Sunday, 20 July 2025
30Monday, 21 July 2025Sunday, 27 July 2025
31Monday, 28 July 2025Sunday, 3 August 2025
32Monday, 4 August 2025Sunday, 10 August 2025
33Monday, 11 August 2025Sunday, 17 August 2025
34Monday, 18 August 2025Sunday, 24 August 2025
35Monday, 25 August 2025Sunday, 31 August 2025
36Monday, 1 September 2025Sunday, 7 September 2025
37Monday, 8 September 2025Sunday, 14 September 2025
38Monday, 15 September 2025Sunday, 21 September 2025
39Monday, 22 September 2025Sunday, 28 September 2025
40Monday, 29 September 2025Sunday, 5 October 2025
41Monday, 6 October 2025Sunday, 12 October 2025
42Monday, 13 October 2025Sunday, 19 October 2025
43Monday, 20 October 2025Sunday, 26 October 2025
44Monday, 27 October 2025Sunday, 2 November 2025
45Monday, 3 November 2025Sunday, 9 November 2025
46Monday, 10 November 2025Sunday, 16 November 2025
47Monday, 17 November 2025Sunday, 23 November 2025
48Monday, 24 November 2025Sunday, 30 November 2025
49Monday, 1 December 2025Sunday, 7 December 2025
50Monday, 8 December 2025Sunday, 14 December 2025
51Monday, 15 December 2025Sunday, 21 December 2025
52Monday, 22 December 2025Sunday, 28 December 2025
1Monday, 29 December 2025Wednesday, 31 December 2025

The first and last row of a year overview can be shorter than seven days.

Week numbers according to the international standard. Source: ISO 8601. More about our sources

How do week numbers work?

Most of the world uses the ISO-8601 standard: weeks start on Monday and week 1 is the week with the first Thursday of the year. A year can therefore start in week 52 or 53 of the previous year.

Week numbers in 2025 explained

2025 has 52 weeks. The year starts on a Wednesday; only years that start on a Thursday, or leap years that start on a Wednesday, get a week 53. The next year with 53 weeks is 2026.

Week 1 of 2025 already starts on Monday, 30 December 2024. The last days of December therefore belong to the new year: if you note a week number on those days, it's week 1.

The last week of the year, week 52, ends on Sunday, 28 December 2025. Then week 1 of 2026 begins, a year with 53 weeks.

Using the 2025 week numbers

The table above shows the Monday each week starts on and the Sunday it ends on. That makes it easy to find the dates that go with a week number, for a delivery, a project milestone or a week of annual leave.

You can print all week numbers of 2025 or download them as an Excel or PDF file.

Frequently asked questions

How many weeks are there in 2025?

2025 has 52 weeks under ISO-8601 week numbering.

When does week 1 of 2025 start?

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

Can I download the 2025 week numbers?

Yes, use the buttons next to the table: print, Excel or PDF.

Is 1 January 2025 in week 1?

Yes. Week 1 of 2025 starts on Monday, 30 December 2024, so 1 January belongs to week 1.

How many weeks are there in 2026?

2026 has 53 weeks.

See also

In other countries