Week numbers 2026
2026 has 53 ISO weeks, each from Monday to Sunday.
| Week | Starts | Ends |
|---|---|---|
| 1 | Mon, Dec 29 2025 | Sun, Jan 4 |
| 2 | Mon, Jan 5 | Sun, Jan 11 |
| 3 | Mon, Jan 12 | Sun, Jan 18 |
| 4 | Mon, Jan 19 | Sun, Jan 25 |
| 5 | Mon, Jan 26 | Sun, Feb 1 |
| 6 | Mon, Feb 2 | Sun, Feb 8 |
| 7 | Mon, Feb 9 | Sun, Feb 15 |
| 8 | Mon, Feb 16 | Sun, Feb 22 |
| 9 | Mon, Feb 23 | Sun, Mar 1 |
| 10 | Mon, Mar 2 | Sun, Mar 8 |
| 11 | Mon, Mar 9 | Sun, Mar 15 |
| 12 | Mon, Mar 16 | Sun, Mar 22 |
| 13 | Mon, Mar 23 | Sun, Mar 29 |
| 14 | Mon, Mar 30 | Sun, Apr 5 |
| 15 | Mon, Apr 6 | Sun, Apr 12 |
| 16 | Mon, Apr 13 | Sun, Apr 19 |
| 17 | Mon, Apr 20 | Sun, Apr 26 |
| 18 | Mon, Apr 27 | Sun, May 3 |
| 19 | Mon, May 4 | Sun, May 10 |
| 20 | Mon, May 11 | Sun, May 17 |
| 21 | Mon, May 18 | Sun, May 24 |
| 22 | Mon, May 25 | Sun, May 31 |
| 23 | Mon, Jun 1 | Sun, Jun 7 |
| 24 | Mon, Jun 8 | Sun, Jun 14 |
| 25 | Mon, Jun 15 | Sun, Jun 21 |
| 26 | Mon, Jun 22 | Sun, Jun 28 |
| 27 | Mon, Jun 29 | Sun, Jul 5 |
| 28 | Mon, Jul 6 | Sun, Jul 12 |
| 29 | Mon, Jul 13 | Sun, Jul 19 |
| 30 | Mon, Jul 20 | Sun, Jul 26 |
| 31 | Mon, Jul 27 | Sun, Aug 2 |
| 32 | Mon, Aug 3 | Sun, Aug 9 |
| 33 | Mon, Aug 10 | Sun, Aug 16 |
| 34 | Mon, Aug 17 | Sun, Aug 23 |
| 35 | Mon, Aug 24 | Sun, Aug 30 |
| 36 | Mon, Aug 31 | Sun, Sep 6 |
| 37 | Mon, Sep 7 | Sun, Sep 13 |
| 38 | Mon, Sep 14 | Sun, Sep 20 |
| 39 | Mon, Sep 21 | Sun, Sep 27 |
| 40 | Mon, Sep 28 | Sun, Oct 4 |
| 41 | Mon, Oct 5 | Sun, Oct 11 |
| 42 | Mon, Oct 12 | Sun, Oct 18 |
| 43 | Mon, Oct 19 | Sun, Oct 25 |
| 44 | Mon, Oct 26 | Sun, Nov 1 |
| 45 | Mon, Nov 2 | Sun, Nov 8 |
| 46 | Mon, Nov 9 | Sun, Nov 15 |
| 47 | Mon, Nov 16 | Sun, Nov 22 |
| 48 | Mon, Nov 23 | Sun, Nov 29 |
| 49 | Mon, Nov 30 | Sun, Dec 6 |
| 50 | Mon, Dec 7 | Sun, Dec 13 |
| 51 | Mon, Dec 14 | Sun, Dec 20 |
| 52 | Mon, Dec 21 | Sun, Dec 27 |
| 53 | Mon, Dec 28 | Sun, Jan 3 2027 |
Other years: week numbers 2027, week numbers 2028. See the 2026 calendar on one page.
Frequently asked questions
How many weeks does 2026 have?
53 ISO weeks. Week 1 starts on Monday, December 29, 2025 and week 53 ends on Sunday, January 3, 2027.
What is an ISO week number?
The international standard (ISO 8601) counts weeks from Monday to Sunday. Week 1 is the week with the year's first Thursday in it, so it can start in late December. Most of Europe and many planners and calendar apps use it.
Why does my calendar app show a different week number?
Some US calendars start weeks on Sunday and call the week containing January 1 "week 1". Around New Year that gives numbers one week off from the ISO system. In Outlook and Google Calendar you can switch to ISO weeks in the settings.