Week numbers 2026

2026 has 53 weeks. Week 1 starts on Monday, 29 December 2025 and week 53 ends on Sunday, 3 January 2027.

All week numbers of 2026 in one list, with the start and end date of every week.

All weeks of 2026

Download as PDF
Week numbers 2026 (ISO-8601)
WeekStart dateEnd date
1Thursday, 1 January 2026Sunday, 4 January 2026
2Monday, 5 January 2026Sunday, 11 January 2026
3Monday, 12 January 2026Sunday, 18 January 2026
4Monday, 19 January 2026Sunday, 25 January 2026
5Monday, 26 January 2026Sunday, 1 February 2026
6Monday, 2 February 2026Sunday, 8 February 2026
7Monday, 9 February 2026Sunday, 15 February 2026
8Monday, 16 February 2026Sunday, 22 February 2026
9Monday, 23 February 2026Sunday, 1 March 2026
10Monday, 2 March 2026Sunday, 8 March 2026
11Monday, 9 March 2026Sunday, 15 March 2026
12Monday, 16 March 2026Sunday, 22 March 2026
13Monday, 23 March 2026Sunday, 29 March 2026
14Monday, 30 March 2026Sunday, 5 April 2026
15Monday, 6 April 2026Sunday, 12 April 2026
16Monday, 13 April 2026Sunday, 19 April 2026
17Monday, 20 April 2026Sunday, 26 April 2026
18Monday, 27 April 2026Sunday, 3 May 2026
19Monday, 4 May 2026Sunday, 10 May 2026
20Monday, 11 May 2026Sunday, 17 May 2026
21Monday, 18 May 2026Sunday, 24 May 2026
22Monday, 25 May 2026Sunday, 31 May 2026
23Monday, 1 June 2026Sunday, 7 June 2026
24Monday, 8 June 2026Sunday, 14 June 2026
25Monday, 15 June 2026Sunday, 21 June 2026
26Monday, 22 June 2026Sunday, 28 June 2026
27Monday, 29 June 2026Sunday, 5 July 2026
28Monday, 6 July 2026Sunday, 12 July 2026
29Monday, 13 July 2026Sunday, 19 July 2026
30Monday, 20 July 2026Sunday, 26 July 2026
31Monday, 27 July 2026Sunday, 2 August 2026
32Monday, 3 August 2026Sunday, 9 August 2026
33Monday, 10 August 2026Sunday, 16 August 2026
34Monday, 17 August 2026Sunday, 23 August 2026
35Monday, 24 August 2026Sunday, 30 August 2026
36Monday, 31 August 2026Sunday, 6 September 2026
37Monday, 7 September 2026Sunday, 13 September 2026
38Monday, 14 September 2026Sunday, 20 September 2026
39Monday, 21 September 2026Sunday, 27 September 2026
40Monday, 28 September 2026Sunday, 4 October 2026
41Monday, 5 October 2026Sunday, 11 October 2026
42Monday, 12 October 2026Sunday, 18 October 2026
43Monday, 19 October 2026Sunday, 25 October 2026
44Monday, 26 October 2026Sunday, 1 November 2026
45Monday, 2 November 2026Sunday, 8 November 2026
46Monday, 9 November 2026Sunday, 15 November 2026
47Monday, 16 November 2026Sunday, 22 November 2026
48Monday, 23 November 2026Sunday, 29 November 2026
49Monday, 30 November 2026Sunday, 6 December 2026
50Monday, 7 December 2026Sunday, 13 December 2026
51Monday, 14 December 2026Sunday, 20 December 2026
52Monday, 21 December 2026Sunday, 27 December 2026
53Monday, 28 December 2026Thursday, 31 December 2026

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 2026 explained

2026 has 53 weeks. That's because 1 January falls on a Thursday: the week with that first Thursday is week 1, which leaves room for a full week 53 at the end of the year. A year like this comes round about once every five to six years.

Week 1 of 2026 already starts on Monday, 29 December 2025. 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 53, ends on Sunday, 3 January 2027. Then week 1 of 2027 begins, a year with 52 weeks.

Using the 2026 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 2026 or download them as an Excel or PDF file.

Frequently asked questions

How many weeks are there in 2026?

2026 has 53 weeks under ISO-8601 week numbering.

When does week 1 of 2026 start?

Week 1 of 2026 starts on Monday, 29 December 2025.

Can I download the 2026 week numbers?

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

Is 1 January 2026 in week 1?

Yes. Week 1 of 2026 starts on Monday, 29 December 2025, so 1 January belongs to week 1.

How many weeks are there in 2027?

2027 has 52 weeks.

See also

In other countries