Week numbers 2026

The week year 2026 has 53 ISO weeks. 29 December 2025 – 3 January 2027.

How many weeks are in 2026?

The ISO week-numbering year 2026 has 53 numbered weeks. The calendar year has 365 days: 52 full weeks plus 1 extra day. The table lists Monday to Sunday for each ISO week. These weeks can extend before January 1 or after December 31.

2026 at a glance

First ISO week: 29 December 2025 – 4 January 2026
Last ISO week: 28 December 2026 – 3 January 2027
January 1: Week 01 / 2026
December 31: Week 53 / 2026
Days in the calendar year: 365

Why 53 numbered weeks?

2026 starts on a Thursday, or is a leap year starting on a Wednesday. Its ISO week-year therefore contains 53 weeks. An extra numbered week does not mean that the calendar year has more than 366 days.

For dates around New Year, include the week-year alongside the week number. The assignments above explicitly show whether January 1 or December 31 belongs to a neighbouring week-year.

Choose a print layout for 2026

One page is useful for quick reference. Twelve monthly pages provide more room for handwritten appointments. The print layout includes dates and ISO weeks, not public holidays or school holidays.

Calendar guide & sources

Full-year calendar with every day

W	From (Mon)	To (Sun)
01	29/12 2025	04/01
02	05/01	11/01
03	12/01	18/01
04	19/01	25/01
05	26/01	01/02
06	02/02	08/02
07	09/02	15/02
08	16/02	22/02
09	23/02	01/03
10	02/03	08/03
11	09/03	15/03
12	16/03	22/03
13	23/03	29/03
14	30/03	05/04
15	06/04	12/04
16	13/04	19/04
17	20/04	26/04
18	27/04	03/05

W	From (Mon)	To (Sun)
19	04/05	10/05
20	11/05	17/05
21	18/05	24/05
22	25/05	31/05
23	01/06	07/06
24	08/06	14/06
25	15/06	21/06
26	22/06	28/06
27	29/06	05/07
28	06/07	12/07
29	13/07	19/07
30	20/07	26/07
31	27/07	02/08
32	03/08	09/08
33	10/08	16/08
34	17/08	23/08
35	24/08	30/08
36	31/08	06/09

W	From (Mon)	To (Sun)
37	07/09	13/09
38	14/09	20/09
39	21/09	27/09
40	28/09	04/10
41	05/10	11/10
42	12/10	18/10
43	19/10	25/10
44	26/10	01/11
45	02/11	08/11
46	09/11	15/11
47	16/11	22/11
48	23/11	29/11
49	30/11	06/12
50	07/12	13/12
51	14/12	20/12
52	21/12	27/12
53	28/12	03/01 2027

ISO 8601 · calendarweek.world

What happens at New Year?

Early January can belong to the previous week year. Late December can already belong to week 1 of the next week year. Dates outside the calendar year include their year in the table.

Other year calendars

Data accuracy and liability

All calendar, public-holiday and school-holiday information is for general guidance. We do not guarantee its accuracy, completeness or timeliness. Regional, local and school-specific differences and short-notice changes are possible. Confirm binding dates with the relevant authority, municipality or school before making plans. Liability for losses arising from use of this information is excluded to the extent permitted by law. Mandatory statutory liability remains unaffected.