Week numbers 2026

Calendar 2026

2026 has 53 ISO weeks. Week 1 begins on December 29 and week 53 ends on January 3. The calendar above is set to print these numbers down the margin.

How ISO week numbering works

Week 1 of a year is the week containing its first Thursday — equivalently, the week containing 4 January. Weeks always run Monday to Sunday. Because of that rule, the first days of January can belong to the last week of the previous year, and the last days of December can already be week 1 of the next.

2026 is one of the years with 53 weeks, which happens when a year starts on a Thursday, or on a Wednesday in a leap year. Anything planned around "52 weeks" will be a week short.

Every week of 2026

WeekFrom (Monday)To (Sunday)
Week 1December 29January 4
Week 2January 5January 11
Week 3January 12January 18
Week 4January 19January 25
Week 5January 26February 1
Week 6February 2February 8
Week 7February 9February 15
Week 8February 16February 22
Week 9February 23March 1
Week 10March 2March 8
Week 11March 9March 15
Week 12March 16March 22
Week 13March 23March 29
Week 14March 30April 5
Week 15April 6April 12
Week 16April 13April 19
Week 17April 20April 26
Week 18April 27May 3
Week 19May 4May 10
Week 20May 11May 17
Week 21May 18May 24
Week 22May 25May 31
Week 23June 1June 7
Week 24June 8June 14
Week 25June 15June 21
Week 26June 22June 28
Week 27June 29July 5
Week 28July 6July 12
Week 29July 13July 19
Week 30July 20July 26
Week 31July 27August 2
Week 32August 3August 9
Week 33August 10August 16
Week 34August 17August 23
Week 35August 24August 30
Week 36August 31September 6
Week 37September 7September 13
Week 38September 14September 20
Week 39September 21September 27
Week 40September 28October 4
Week 41October 5October 11
Week 42October 12October 18
Week 43October 19October 25
Week 44October 26November 1
Week 45November 2November 8
Week 46November 9November 15
Week 47November 16November 22
Week 48November 23November 29
Week 49November 30December 6
Week 50December 7December 13
Week 51December 14December 20
Week 52December 21December 27
Week 53December 28January 3

Print a calendar with these numbers

Week numbers are a switch on every layout, not a separate product — see calendar with week numbers for where they appear in each one. They stay Monday-based even if you set the calendar itself to start on Sunday, so the numbers keep matching everybody else's.

Months of 2026

Other years