Week numbers 2027

2027 has 52 weeks. Week 1 starts on Monday, 4 January 2027 and week 52 ends on Sunday, 2 January 2028.

All week numbers of 2027 in one list, with the start and end date of every week.

All weeks of 2027

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Week numbers 2027 (ISO-8601)
WeekStart dateEnd date
53Friday, 1 January 2027Sunday, 3 January 2027
1Monday, 4 January 2027Sunday, 10 January 2027
2Monday, 11 January 2027Sunday, 17 January 2027
3Monday, 18 January 2027Sunday, 24 January 2027
4Monday, 25 January 2027Sunday, 31 January 2027
5Monday, 1 February 2027Sunday, 7 February 2027
6Monday, 8 February 2027Sunday, 14 February 2027
7Monday, 15 February 2027Sunday, 21 February 2027
8Monday, 22 February 2027Sunday, 28 February 2027
9Monday, 1 March 2027Sunday, 7 March 2027
10Monday, 8 March 2027Sunday, 14 March 2027
11Monday, 15 March 2027Sunday, 21 March 2027
12Monday, 22 March 2027Sunday, 28 March 2027
13Monday, 29 March 2027Sunday, 4 April 2027
14Monday, 5 April 2027Sunday, 11 April 2027
15Monday, 12 April 2027Sunday, 18 April 2027
16Monday, 19 April 2027Sunday, 25 April 2027
17Monday, 26 April 2027Sunday, 2 May 2027
18Monday, 3 May 2027Sunday, 9 May 2027
19Monday, 10 May 2027Sunday, 16 May 2027
20Monday, 17 May 2027Sunday, 23 May 2027
21Monday, 24 May 2027Sunday, 30 May 2027
22Monday, 31 May 2027Sunday, 6 June 2027
23Monday, 7 June 2027Sunday, 13 June 2027
24Monday, 14 June 2027Sunday, 20 June 2027
25Monday, 21 June 2027Sunday, 27 June 2027
26Monday, 28 June 2027Sunday, 4 July 2027
27Monday, 5 July 2027Sunday, 11 July 2027
28Monday, 12 July 2027Sunday, 18 July 2027
29Monday, 19 July 2027Sunday, 25 July 2027
30Monday, 26 July 2027Sunday, 1 August 2027
31Monday, 2 August 2027Sunday, 8 August 2027
32Monday, 9 August 2027Sunday, 15 August 2027
33Monday, 16 August 2027Sunday, 22 August 2027
34Monday, 23 August 2027Sunday, 29 August 2027
35Monday, 30 August 2027Sunday, 5 September 2027
36Monday, 6 September 2027Sunday, 12 September 2027
37Monday, 13 September 2027Sunday, 19 September 2027
38Monday, 20 September 2027Sunday, 26 September 2027
39Monday, 27 September 2027Sunday, 3 October 2027
40Monday, 4 October 2027Sunday, 10 October 2027
41Monday, 11 October 2027Sunday, 17 October 2027
42Monday, 18 October 2027Sunday, 24 October 2027
43Monday, 25 October 2027Sunday, 31 October 2027
44Monday, 1 November 2027Sunday, 7 November 2027
45Monday, 8 November 2027Sunday, 14 November 2027
46Monday, 15 November 2027Sunday, 21 November 2027
47Monday, 22 November 2027Sunday, 28 November 2027
48Monday, 29 November 2027Sunday, 5 December 2027
49Monday, 6 December 2027Sunday, 12 December 2027
50Monday, 13 December 2027Sunday, 19 December 2027
51Monday, 20 December 2027Sunday, 26 December 2027
52Monday, 27 December 2027Friday, 31 December 2027

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 2027 explained

2027 has 52 weeks. The year starts on a Friday; 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 2032.

Week 1 starts on Monday, 4 January 2027. The days before, up to and including 3 January, still belong to week 53 of 2026.

The last week of the year, week 52, ends on Sunday, 2 January 2028. Then week 1 of 2028 begins, a year with 52 weeks.

Using the 2027 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 2027 or download them as an Excel or PDF file.

Frequently asked questions

How many weeks are there in 2027?

2027 has 52 weeks under ISO-8601 week numbering.

When does week 1 of 2027 start?

Week 1 of 2027 starts on Monday, 4 January 2027.

Can I download the 2027 week numbers?

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

Is 1 January 2027 in week 1?

No. Up to and including 3 January, January still belongs to week 53 of 2026. Week 1 only starts on Monday, 4 January 2027.

How many weeks are there in 2028?

2028 has 52 weeks.

See also

In other countries