Weeknumber.io

Monday-first year view

2025 calendar with week numbers

A compact calendar showing the ISO week number beside every Monday–Sunday row. Select a week number to see that week's dates and holidays.

January

WkMTWTFSS
1
2
3
4
5

February

WkMTWTFSS
5
6
7
8
9

March

WkMTWTFSS
9
10
11
12
13
14

April

WkMTWTFSS
14
15
16
17
18

May

WkMTWTFSS
18
19
20
21
22

June

WkMTWTFSS
22
23
24
25
26
27

July

WkMTWTFSS
27
28
29
30
31

August

WkMTWTFSS
31
32
33
34
35

September

WkMTWTFSS
36
37
38
39
40

October

WkMTWTFSS
40
41
42
43
44

November

WkMTWTFSS
44
45
46
47
48

December

WkMTWTFSS
49
50
51
52
1

Wk means ISO week number. Muted dates belong to the previous or following month. The current date and week are highlighted when viewing the current year.

US federal holidays 2025

HolidayDateISO week
New Year's DayWeek 1
Martin Luther King Jr. DayWeek 4
Washington's Birthday (Presidents' Day)Week 8
Memorial DayWeek 22
Juneteenth National Independence DayWeek 25
Independence DayWeek 27
Labor DayWeek 36
Columbus Day (Indigenous Peoples' Day)Week 42
Veterans DayWeek 46
Thanksgiving DayWeek 48
Christmas DayWeek 52

When a fixed-date holiday falls on a Saturday or Sunday, the day off is usually observed on the Friday before or the Monday after.

How to read week numbers

Each row is one ISO week, Monday to Sunday. Week 1 is the week with the first Thursday of the year, so the first row of January can start in December. 2025 has 52 ISO weeks.

US wall calendars often start the week on Sunday and number weeks differently. If a colleague quotes another number, check which system they use, or compare both on the week pages.