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2026 calendar with ISO week numbers, printable preview
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Week numbers 2026

WeekMondaySunday
Week 1Mon, Dec 29, 2025Sun, Jan 4, 2026
Week 2Mon, Jan 5, 2026Sun, Jan 11, 2026
Week 3Mon, Jan 12, 2026Sun, Jan 18, 2026
Week 4Mon, Jan 19, 2026Sun, Jan 25, 2026
Week 5Mon, Jan 26, 2026Sun, Feb 1, 2026
Week 6Mon, Feb 2, 2026Sun, Feb 8, 2026
Week 7Mon, Feb 9, 2026Sun, Feb 15, 2026
Week 8Mon, Feb 16, 2026Sun, Feb 22, 2026
Week 9Mon, Feb 23, 2026Sun, Mar 1, 2026
Week 10Mon, Mar 2, 2026Sun, Mar 8, 2026
Week 11Mon, Mar 9, 2026Sun, Mar 15, 2026
Week 12Mon, Mar 16, 2026Sun, Mar 22, 2026
Week 13Mon, Mar 23, 2026Sun, Mar 29, 2026
Week 14Mon, Mar 30, 2026Sun, Apr 5, 2026
Week 15Mon, Apr 6, 2026Sun, Apr 12, 2026
Week 16Mon, Apr 13, 2026Sun, Apr 19, 2026
Week 17Mon, Apr 20, 2026Sun, Apr 26, 2026
Week 18Mon, Apr 27, 2026Sun, May 3, 2026
Week 19Mon, May 4, 2026Sun, May 10, 2026
Week 20Mon, May 11, 2026Sun, May 17, 2026
Week 21Mon, May 18, 2026Sun, May 24, 2026
Week 22Mon, May 25, 2026Sun, May 31, 2026
Week 23Mon, Jun 1, 2026Sun, Jun 7, 2026
Week 24Mon, Jun 8, 2026Sun, Jun 14, 2026
Week 25Mon, Jun 15, 2026Sun, Jun 21, 2026
Week 26Mon, Jun 22, 2026Sun, Jun 28, 2026
Week 27Mon, Jun 29, 2026Sun, Jul 5, 2026
Week 28Mon, Jul 6, 2026Sun, Jul 12, 2026
Week 29Mon, Jul 13, 2026Sun, Jul 19, 2026
Week 30Mon, Jul 20, 2026Sun, Jul 26, 2026
Week 31Mon, Jul 27, 2026Sun, Aug 2, 2026
Week 32Mon, Aug 3, 2026Sun, Aug 9, 2026
Week 33Mon, Aug 10, 2026Sun, Aug 16, 2026
Week 34Mon, Aug 17, 2026Sun, Aug 23, 2026
Week 35Mon, Aug 24, 2026Sun, Aug 30, 2026
Week 36Mon, Aug 31, 2026Sun, Sep 6, 2026
Week 37Mon, Sep 7, 2026Sun, Sep 13, 2026
Week 38Mon, Sep 14, 2026Sun, Sep 20, 2026
Week 39Mon, Sep 21, 2026Sun, Sep 27, 2026
Week 40Mon, Sep 28, 2026Sun, Oct 4, 2026
Week 41Mon, Oct 5, 2026Sun, Oct 11, 2026
Week 42Mon, Oct 12, 2026Sun, Oct 18, 2026
Week 43Mon, Oct 19, 2026Sun, Oct 25, 2026
Week 44Mon, Oct 26, 2026Sun, Nov 1, 2026
Week 45Mon, Nov 2, 2026Sun, Nov 8, 2026
Week 46Mon, Nov 9, 2026Sun, Nov 15, 2026
Week 47Mon, Nov 16, 2026Sun, Nov 22, 2026
Week 48Mon, Nov 23, 2026Sun, Nov 29, 2026
Week 49Mon, Nov 30, 2026Sun, Dec 6, 2026
Week 50Mon, Dec 7, 2026Sun, Dec 13, 2026
Week 51Mon, Dec 14, 2026Sun, Dec 20, 2026
Week 52Mon, Dec 21, 2026Sun, Dec 27, 2026
Week 53Mon, Dec 28, 2026Sun, Jan 3, 2027

How ISO week numbers work

ISO 8601 numbers weeks from Monday to Sunday. Week 1 is the week with the year's first Thursday, so it always contains January 4. A year has 52 or 53 weeks; 2026 has 53. Week numbers are common in business planning, manufacturing, logistics and in most of Europe.

US calendars sometimes count week 1 as the week that contains January 1 and start weeks on Sunday. If a colleague's week number is off by one, that is usually why.

Questions and answers

How many weeks are in 2026?

2026 has 53 ISO weeks. Week 1 starts on Monday, Monday, December 29, 2025.

How are week numbers counted?

By ISO 8601: weeks run Monday to Sunday, and week 1 is the week that contains the first Thursday of the year (the same as the week containing January 4). Some US systems count differently, starting week 1 on January 1.

Why does January 1, 2026 belong to another week?

Thursday, January 1, 2026 falls early enough in the week to be in week 1.

Related

Week Numbers 2027All 52 week numbers of 2027 with start and end dates (ISO 8601, Monday to Sunday). Week 1 starts January 4, 2027. Printable calendar with week numbers.Fiscal Calendar 2027Fiscal year 2027 dates: the US federal fiscal year (Oct 1, 2026 to Sep 30, 2027) and the 4-5-4 retail calendar (Jan 31, 2027 to Jan 29, 2028), printable.2027 Weekly PlannerA dated 2027 weekly planner: 52 pages, one for each ISO week from January 4, 2027, with the week number and dates printed. Free Letter and A4 PDF.