Week numbers follow ISO 8601: weeks run Monday to Sunday, and week 1 is the week with the year's first Thursday. 2026 has 53 weeks. The live display above shows the current week in your time zone.
ISO week numbers 2026 (53 weeks)
| Week | Monday | Sunday |
|---|---|---|
| 1 | Dec 29, 2025 | Jan 4, 2026 |
| 2 | Jan 5, 2026 | Jan 11, 2026 |
| 3 | Jan 12, 2026 | Jan 18, 2026 |
| 4 | Jan 19, 2026 | Jan 25, 2026 |
| 5 | Jan 26, 2026 | Feb 1, 2026 |
| 6 | Feb 2, 2026 | Feb 8, 2026 |
| 7 | Feb 9, 2026 | Feb 15, 2026 |
| 8 | Feb 16, 2026 | Feb 22, 2026 |
| 9 | Feb 23, 2026 | Mar 1, 2026 |
| 10 | Mar 2, 2026 | Mar 8, 2026 |
| 11 | Mar 9, 2026 | Mar 15, 2026 |
| 12 | Mar 16, 2026 | Mar 22, 2026 |
| 13 | Mar 23, 2026 | Mar 29, 2026 |
| 14 | Mar 30, 2026 | Apr 5, 2026 |
| 15 | Apr 6, 2026 | Apr 12, 2026 |
| 16 | Apr 13, 2026 | Apr 19, 2026 |
| 17 | Apr 20, 2026 | Apr 26, 2026 |
| 18 | Apr 27, 2026 | May 3, 2026 |
| 19 | May 4, 2026 | May 10, 2026 |
| 20 | May 11, 2026 | May 17, 2026 |
| 21 | May 18, 2026 | May 24, 2026 |
| 22 | May 25, 2026 | May 31, 2026 |
| 23 | Jun 1, 2026 | Jun 7, 2026 |
| 24 | Jun 8, 2026 | Jun 14, 2026 |
| 25 | Jun 15, 2026 | Jun 21, 2026 |
| 26 | Jun 22, 2026 | Jun 28, 2026 |
| 27 | Jun 29, 2026 | Jul 5, 2026 |
| 28 | Jul 6, 2026 | Jul 12, 2026 |
| 29 | Jul 13, 2026 | Jul 19, 2026 |
| 30 | Jul 20, 2026 | Jul 26, 2026 |
| 31 | Jul 27, 2026 | Aug 2, 2026 |
| 32 | Aug 3, 2026 | Aug 9, 2026 |
| 33 | Aug 10, 2026 | Aug 16, 2026 |
| 34 | Aug 17, 2026 | Aug 23, 2026 |
| 35 | Aug 24, 2026 | Aug 30, 2026 |
| 36 | Aug 31, 2026 | Sep 6, 2026 |
| 37 | Sep 7, 2026 | Sep 13, 2026 |
| 38 | Sep 14, 2026 | Sep 20, 2026 |
| 39 | Sep 21, 2026 | Sep 27, 2026 |
| 40 | Sep 28, 2026 | Oct 4, 2026 |
| 41 | Oct 5, 2026 | Oct 11, 2026 |
| 42 | Oct 12, 2026 | Oct 18, 2026 |
| 43 | Oct 19, 2026 | Oct 25, 2026 |
| 44 | Oct 26, 2026 | Nov 1, 2026 |
| 45 | Nov 2, 2026 | Nov 8, 2026 |
| 46 | Nov 9, 2026 | Nov 15, 2026 |
| 47 | Nov 16, 2026 | Nov 22, 2026 |
| 48 | Nov 23, 2026 | Nov 29, 2026 |
| 49 | Nov 30, 2026 | Dec 6, 2026 |
| 50 | Dec 7, 2026 | Dec 13, 2026 |
| 51 | Dec 14, 2026 | Dec 20, 2026 |
| 52 | Dec 21, 2026 | Dec 27, 2026 |
| 53 | Dec 28, 2026 | Jan 3, 2027 |
ISO week numbers 2027 (52 weeks)
| Week | Monday | Sunday |
|---|---|---|
| 1 | Jan 4, 2027 | Jan 10, 2027 |
| 2 | Jan 11, 2027 | Jan 17, 2027 |
| 3 | Jan 18, 2027 | Jan 24, 2027 |
| 4 | Jan 25, 2027 | Jan 31, 2027 |
| 5 | Feb 1, 2027 | Feb 7, 2027 |
| 6 | Feb 8, 2027 | Feb 14, 2027 |
| 7 | Feb 15, 2027 | Feb 21, 2027 |
| 8 | Feb 22, 2027 | Feb 28, 2027 |
| 9 | Mar 1, 2027 | Mar 7, 2027 |
| 10 | Mar 8, 2027 | Mar 14, 2027 |
| 11 | Mar 15, 2027 | Mar 21, 2027 |
| 12 | Mar 22, 2027 | Mar 28, 2027 |
| 13 | Mar 29, 2027 | Apr 4, 2027 |
| 14 | Apr 5, 2027 | Apr 11, 2027 |
| 15 | Apr 12, 2027 | Apr 18, 2027 |
| 16 | Apr 19, 2027 | Apr 25, 2027 |
| 17 | Apr 26, 2027 | May 2, 2027 |
| 18 | May 3, 2027 | May 9, 2027 |
| 19 | May 10, 2027 | May 16, 2027 |
| 20 | May 17, 2027 | May 23, 2027 |
| 21 | May 24, 2027 | May 30, 2027 |
| 22 | May 31, 2027 | Jun 6, 2027 |
| 23 | Jun 7, 2027 | Jun 13, 2027 |
| 24 | Jun 14, 2027 | Jun 20, 2027 |
| 25 | Jun 21, 2027 | Jun 27, 2027 |
| 26 | Jun 28, 2027 | Jul 4, 2027 |
| 27 | Jul 5, 2027 | Jul 11, 2027 |
| 28 | Jul 12, 2027 | Jul 18, 2027 |
| 29 | Jul 19, 2027 | Jul 25, 2027 |
| 30 | Jul 26, 2027 | Aug 1, 2027 |
| 31 | Aug 2, 2027 | Aug 8, 2027 |
| 32 | Aug 9, 2027 | Aug 15, 2027 |
| 33 | Aug 16, 2027 | Aug 22, 2027 |
| 34 | Aug 23, 2027 | Aug 29, 2027 |
| 35 | Aug 30, 2027 | Sep 5, 2027 |
| 36 | Sep 6, 2027 | Sep 12, 2027 |
| 37 | Sep 13, 2027 | Sep 19, 2027 |
| 38 | Sep 20, 2027 | Sep 26, 2027 |
| 39 | Sep 27, 2027 | Oct 3, 2027 |
| 40 | Oct 4, 2027 | Oct 10, 2027 |
| 41 | Oct 11, 2027 | Oct 17, 2027 |
| 42 | Oct 18, 2027 | Oct 24, 2027 |
| 43 | Oct 25, 2027 | Oct 31, 2027 |
| 44 | Nov 1, 2027 | Nov 7, 2027 |
| 45 | Nov 8, 2027 | Nov 14, 2027 |
| 46 | Nov 15, 2027 | Nov 21, 2027 |
| 47 | Nov 22, 2027 | Nov 28, 2027 |
| 48 | Nov 29, 2027 | Dec 5, 2027 |
| 49 | Dec 6, 2027 | Dec 12, 2027 |
| 50 | Dec 13, 2027 | Dec 19, 2027 |
| 51 | Dec 20, 2027 | Dec 26, 2027 |
| 52 | Dec 27, 2027 | Jan 2, 2028 |
Frequently asked questions
What week number is it?
The live display above shows the current ISO week number and the Monday-to-Sunday dates of this week, in your time zone.
How are ISO week numbers defined?
Under ISO 8601, weeks start on Monday, and week 1 is the week that contains the first Thursday of the year (equivalently, the week containing January 4). A year has 52 or 53 ISO weeks.
How many weeks are in 2026?
2026 has 53 ISO weeks. 2027 has 52.
Why is my US calendar's week number different?
Many US calendars start weeks on Sunday and count the week containing January 1 as week 1. That can shift the number by one compared with ISO weeks, especially near the start and end of the year.
Who uses week numbers?
Week numbers are common in Europe and in business planning, retail, manufacturing, payroll and project management, for example "shipping in week 45".
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Sources
Reviewed by Gurmej Singh, Founder, Divy Digital Hub · Last reviewed: Wednesday, September 30, 2026. All calculations run in your browser. Editorial policy.