Week Numbers 2026

What Week of the Year Is It
Week numbers of

What week of 2026 is it today?

Answer

Today, , is in ISO
week 41

ISO week 41 of 2026 runs from Monday, October 5, 2026, to Sunday, October 11, 2026. (UTC)

In the US week numbering (weeks run Sunday to Saturday, week 1 is the week that contains January 1) today is in week 41 of 2026: Sunday, October 4, 2026, to Saturday, October 10, 2026.

All 53 ISO weeks of 2026

WeekMondaySunday
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53

ISO weeks are always whole, Monday to Sunday, so the numbering of 2026 starts on Monday, December 29, 2025, and ends on Sunday, January 3, 2027. To see these weeks inside the months, open the 2026 calendar with week numbers.

Why 2026 has 53 ISO weeks

53 weeks ⇔ January 1 is a Thursday, or a Wednesday in a leap year

2026 starts on Thursday, January 1, 2026, and ends on Thursday, December 31, 2026; it is a common year of 365 days. January 1 is a Thursday, so it has 53 numbered weeks. Week 1 is the week that contains the first Thursday of the year, January 1, 2026.

Counted as whole blocks of seven days inside the calendar year, 2026 is 365 = 52 × 7 + 1, that is 52 weeks and 1 day. Both are true: the numbered ISO weeks are whole, so the first and the last of them may borrow days from the neighbouring years.

In the US numbering (weeks from Sunday, week 1 is the week that contains January 1) 2026 has 52 weeks, and week 1 starts on Sunday, December 28, 2025.

Related Calculations

See Also

What Week of the Year Is It

This page tells you the number of the current week in the ISO 8601 system — weeks start on Monday and week 1 is the week with the first Thursday of the year — and in the US system, where weeks start on Sunday. For any year it lists every numbered week with the dates of its Monday and Sunday. For example, it can help you find out what week of 2026 is it today? (The answer is: Week 41). Enter a year (e.g. "2026") and hit the "Show" button.
Recalculate with different values ↑

ISO Weeks in Nearby Years

YearISO weeksWeek 1 startsLast week ends
202053Dec 30, 2019Jan 3, 2021
202152Jan 4, 2021Jan 2, 2022
202252Jan 3, 2022Jan 1, 2023
202352Jan 2, 2023Dec 31, 2023
202452Jan 1, 2024Dec 29, 2024
202552Dec 30, 2024Dec 28, 2025
202653Dec 29, 2025Jan 3, 2027
202752Jan 4, 2027Jan 2, 2028
202852Jan 3, 2028Dec 31, 2028
202952Jan 1, 2029Dec 30, 2029
203052Dec 31, 2029Dec 29, 2030

FAQ

What week of 2026 is it today?

Today, October 6, 2026, is in ISO week 41

When does week 1 of 2026 start?

Week 1 of 2026 runs from Monday, December 29, 2025, to Sunday, January 4, 2026. It is the week that contains the first Thursday of the year, January 1, 2026.

When does the last week of 2026 end?

The last ISO week of 2026 is week 53: Monday, December 28, 2026, to Sunday, January 3, 2027.

Why does 2026 have 53 ISO weeks?

2026 starts on a Thursday and ends on a Thursday, and it is a common year of 365 days. A year has 53 ISO weeks when 1 January is a Thursday, or a Wednesday in a leap year — here it is a Thursday.

See Also