Week numbers 2021

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On this page, you can find all week numbers 2021.

Week numbers by years:

2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030


Week Numbers 2021 (Monday to sunday)

  • Calendar Weeks start on Monday and end on Sunday. The current week is 04, (2022).
  • Week numbers according to ISO-8601 (ISO week date standard). 
  • The first calendar week is always the week that contains four or more days of the new yearIt’s the week with the first Thursday of the new year or the first week, including the 4th of January.

<<< Week numbers 2020

Week NumberStart Date (MONDAY)End Date (SUNDAY)
Week 53 (2020)December 28, 2020January 3, 2021
Week 1January 4, 2021January 10, 2021
Week 2January 11, 2021January 17, 2021
Week 3January 18, 2021January 24, 2021
Week 4January 25, 2021January 31, 2021
Week 5February 1, 2021February 7, 2021
Week 6February 8, 2021February 14, 2021
Week 7February 15, 2021February 21, 2021
Week 8February 22, 2021February 28, 2021
Week 9March 1, 2021March 7, 2021
Week 10March 8, 2021March 14, 2021
Week 11March 15, 2021March 21, 2021
Week 12March 22, 2021March 28, 2021
Week 13March 29, 2021April 4, 2021
Week 14April 5, 2021April 11, 2021
Week 15April 12, 2021April 18, 2021
Week 16April 19, 2021April 25, 2021
Week 17April 26, 2021May 2, 2021
Week 18May 3, 2021May 9, 2021
Week 19May 10, 2021May 16, 2021
Week 20May 17, 2021May 23, 2021
Week 21May 24, 2021May 30, 2021
Week 22May 31, 2021June 6, 2021
Week 23June 7, 2021June 13, 2021
Week 24June 14, 2021June 20, 2021
Week 25June 21, 2021June 27, 2021
Week 26June 28, 2021July 4, 2021
Week 27July 5, 2021July 11, 2021
Week 28July 12, 2021July 18, 2021
Week 29July 19, 2021July 25, 2021
Week 30July 26, 2021August 1, 2021
Week 31August 2, 2021August 8, 2021
Week 32August 9, 2021August 15, 2021
Week 33August 16, 2021August 22, 2021
Week 34August 23, 2021August 29, 2021
Week 35August 30, 2021September 5, 2021
Week 36September 6, 2021September 12, 2021
Week 37September 13, 2021September 19, 2021
Week 38September 20, 2021September 26, 2021
Week 39September 27, 2021October 3, 2021
Week 40October 4, 2021October 10, 2021
Week 41October 11, 2021October 17, 2021
Week 42October 18, 2021October 24, 2021
Week 43October 25, 2021October 31, 2021
Week 44November 1, 2021November 7, 2021
Week 45November 8, 2021November 14, 2021
Week 46November 15, 2021November 21, 2021
Week 47November 22, 2021November 28, 2021
Week 48November 29, 2021December 5, 2021
Week 49December 6, 2021December 12, 2021
Week 50December 13, 2021December 19, 2021
Week 51December 20, 2021December 26, 2021
Week 52December 27, 2021January 2, 2022
Week 1 (2022)January 3, 2022January 9, 2022
Week numbers 2021 (Monday to Sunday)
2021 calendar with week numbers - Weeks start on Monday and end on Sunday.
2021 calendar with week numbers – Weeks start on Monday and end on Sunday.

Week Numbers 2021 (Sunday to Saturday)

If you’re looking for weeks according to United States calendar rules, where Sunday is the first day and the week is from Sunday to Saturday, you can find them here.

Week NumberStart Date (SUNDAY)End Date (SATURDAY)
Week 53 (2020)December 27, 2020January 2, 2021
Week 1January 3, 2021January 9, 2021
Week 2January 10, 2021January 16, 2021
Week 3January 17, 2021January 23, 2021
Week 4January 24, 2021January 30, 2021
Week 5January 31, 2021February 6, 2021
Week 6February 7, 2021February 13, 2021
Week 7February 14, 2021February 20, 2021
Week 8February 21, 2021February 27, 2021
Week 9February 28, 2021March 6, 2021
Week 10March 7, 2021March 13, 2021
Week 11March 14, 2021March 20, 2021
Week 12March 21, 2021March 27, 2021
Week 13March 28, 2021April 3, 2021
Week 14April 4, 2021April 10, 2021
Week 15April 11, 2021April 17, 2021
Week 16April 18, 2021April 24, 2021
Week 17April 25, 2021May 1, 2021
Week 18May 2, 2021May 8, 2021
Week 19May 9, 2021May 15, 2021
Week 20May 16, 2021May 22, 2021
Week 21May 23, 2021May 29, 2021
Week 22May 30, 2021June 5, 2021
Week 23June 6, 2021June 12, 2021
Week 24June 13, 2021June 19, 2021
Week 25June 20, 2021June 26, 2021
Week 26June 27, 2021July 3, 2021
Week 27July 4, 2021July 10, 2021
Week 28July 11, 2021July 17, 2021
Week 29July 18, 2021July 24, 2021
Week 30July 25, 2021July 31, 2021
Week 31August 1, 2021August 7, 2021
Week 32August 8, 2021August 14, 2021
Week 33August 15, 2021August 21, 2021
Week 34August 22, 2021August 28, 2021
Week 35August 29, 2021September 4, 2021
Week 36September 5, 2021September 11, 2021
Week 37September 12, 2021September 18, 2021
Week 38September 19, 2021September 25, 2021
Week 39September 26, 2021October 2, 2021
Week 40October 3, 2021October 9, 2021
Week 41October 10, 2021October 16, 2021
Week 42October 17, 2021October 23, 2021
Week 43October 24, 2021October 30, 2021
Week 44October 31, 2021November 6, 2021
Week 45November 7, 2021November 13, 2021
Week 46November 14, 2021November 20, 2021
Week 47November 21, 2021November 27, 2021
Week 48November 28, 2021December 4, 2021
Week 49December 5, 2021December 11, 2021
Week 50December 12, 2021December 18, 2021
Week 51December 19, 2021December 25, 2021
Week 52December 26, 2021January 1, 2022
Week 1 (2022)January 2, 2022January 8, 2022
Week numbers 2021 (Sunday to Saturday)
2021 calendar with week numbers - Weeks start on Sunday and end on Saturday.
2021 calendar with week numbers – Weeks start on Sunday and end on Saturday.

In need of a printable 2021 calendar with week numbers?

You can find free printable 2021 yearly one-page calendars from this post: Printable 2021 Yearly Calendars – Simple & Minimal SaturdayGift Designs.

There are both Monday-starting calendars and Sunday-starting calendars, and they’re both week numbered.

Week numbers for other years:

2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030

How many weeks in 2021?

There are 52 weeks in 2021.

How many days in 2021?

There are 365 days in 2021. The year 2021 is not a leap year.
The year 2021 starts on Friday, January 01, 2021, and ends on Friday, December 31, 2021.