Week numbers 2026

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

All week numbers of 2026, with the start and end date of every week, in both the ISO-8601 standard and the US system.

All weeks of 2026

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

The US count (weeks start on Sunday, week 1 contains 1 January) is a common convention without an official standard.

US week numbers 2026

In the United States weeks start on Sunday and week 1 is the week containing January 1 (as in Excel WEEKNUM and Outlook).

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

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: US and ISO

In the US system, 2026 is divided into 53 numbered weeks. Week 1 starts on January 1, a Thursday, and ends on the first Saturday of the year. Every following week runs from Sunday to Saturday, and the last week ends on December 31, so the first and last weeks can be shorter than seven days.

Under ISO 8601, 2026 has 53 weeks, each running from Monday to Sunday. ISO week 1 starts on Monday, December 29, 2025.

2026 has 53 ISO weeks because January 1 falls on a Thursday.

The next year with 53 ISO weeks is 2032.

Because ISO week 1 already starts on Monday, December 29, 2025, the last days of December belong to ISO week 1 of 2026, while in the US system they are still part of the old year.

Using the 2026 week numbers

The tables above show the start and end date of every week in both systems. That makes it easy to find the dates for a week number, for a delivery, a payroll period or a project deadline, whichever system your company or partner uses.

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 and 53 weeks in the US system, where a new week starts every Sunday.

When does week 1 of 2026 start?

In the US system, week 1 starts on January 1. Under ISO-8601, week 1 of 2026 starts on Monday, December 29, 2025.

Can I download the 2026 week numbers?

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

What day of the week does 2026 start on?

January 1, 2026 is a Thursday. In the US system, week 1 runs from that day until the first Saturday of the year.

How many weeks are there in 2027?

Under ISO-8601, 2027 has 52 weeks.

See also

In other countries