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Week Number Calculator

Find the week number of any date instantly with our precision tech-noir suite.

Current Week21of 53 weeks in 2026
May 20, 2026Wednesday
event

Convert Date to Week

ISO 8601

W21

US Week

21

Quarter

Q2

Day of Year

140

Remaining

225

date_range

Convert Week to Dates

The week spans from:Monday May 18Sunday May 24, 2026
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Year 2026 Overview

Week #Monday — Sunday Range
01
Dec 29Jan 4, 2026
02
Jan 5Jan 11, 2026
03
Jan 12Jan 18, 2026
04
Jan 19Jan 25, 2026
05
Jan 26Feb 1, 2026
06
Feb 2Feb 8, 2026
07
Feb 9Feb 15, 2026
08
Feb 16Feb 22, 2026
09
Feb 23Mar 1, 2026
10
Mar 2Mar 8, 2026
11
Mar 9Mar 15, 2026
12
Mar 16Mar 22, 2026
13
Mar 23Mar 29, 2026
14
Mar 30Apr 5, 2026
15
Apr 6Apr 12, 2026
16
Apr 13Apr 19, 2026
17
Apr 20Apr 26, 2026
18
Apr 27May 3, 2026
19
May 4May 10, 2026
20
May 11May 17, 2026
21
May 18May 24, 2026stars
22
May 25May 31, 2026
23
Jun 1Jun 7, 2026
24
Jun 8Jun 14, 2026
25
Jun 15Jun 21, 2026
26
Jun 22Jun 28, 2026
27
Jun 29Jul 5, 2026
28
Jul 6Jul 12, 2026
29
Jul 13Jul 19, 2026
30
Jul 20Jul 26, 2026
31
Jul 27Aug 2, 2026
32
Aug 3Aug 9, 2026
33
Aug 10Aug 16, 2026
34
Aug 17Aug 23, 2026
35
Aug 24Aug 30, 2026
36
Aug 31Sep 6, 2026
37
Sep 7Sep 13, 2026
38
Sep 14Sep 20, 2026
39
Sep 21Sep 27, 2026
40
Sep 28Oct 4, 2026
41
Oct 5Oct 11, 2026
42
Oct 12Oct 18, 2026
43
Oct 19Oct 25, 2026
44
Oct 26Nov 1, 2026
45
Nov 2Nov 8, 2026
46
Nov 9Nov 15, 2026
47
Nov 16Nov 22, 2026
48
Nov 23Nov 29, 2026
49
Nov 30Dec 6, 2026
50
Dec 7Dec 13, 2026
51
Dec 14Dec 20, 2026
52
Dec 21Dec 27, 2026
53
Dec 28Jan 3, 2027
info

ISO 8601 Explained

The ISO 8601 week date system is an international standard for designating days and weeks. A year has 52 or 53 full weeks. Week 01 of any year is defined as the week with the first Thursday of the year in it.

  • check_circleWeeks always start on a Monday.
  • check_circleThe first week of the year is the one that contains January 4th.
  • check_circleThe US system differs, often starting weeks on Sundays and defining Week 1 as the week containing January 1st.

Frequently Asked Questions