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How many weeks are in 2021?

52
ISO weeks in 2021
Standard 52-week year

Key facts

Total ISO weeks
52
Week 1 starts
Monday, January 4, 2021
Week 52 ends
Sunday, January 2, 2022
Leap year
No (365 days)

All weeks

WkMondaySundayISO
W1Monday, January 4, 2021Sunday, January 10, 20212021-W01
W2Monday, January 11, 2021Sunday, January 17, 20212021-W02
W3Monday, January 18, 2021Sunday, January 24, 20212021-W03
W4Monday, January 25, 2021Sunday, January 31, 20212021-W04
W5Monday, February 1, 2021Sunday, February 7, 20212021-W05
W6Monday, February 8, 2021Sunday, February 14, 20212021-W06
W7Monday, February 15, 2021Sunday, February 21, 20212021-W07
W8Monday, February 22, 2021Sunday, February 28, 20212021-W08
W9Monday, March 1, 2021Sunday, March 7, 20212021-W09
W10Monday, March 8, 2021Sunday, March 14, 20212021-W10
W11Monday, March 15, 2021Sunday, March 21, 20212021-W11
W12Monday, March 22, 2021Sunday, March 28, 20212021-W12
W13Monday, March 29, 2021Sunday, April 4, 20212021-W13
W14Monday, April 5, 2021Sunday, April 11, 20212021-W14
W15Monday, April 12, 2021Sunday, April 18, 20212021-W15
W16Monday, April 19, 2021Sunday, April 25, 20212021-W16
W17Monday, April 26, 2021Sunday, May 2, 20212021-W17
W18Monday, May 3, 2021Sunday, May 9, 20212021-W18
W19Monday, May 10, 2021Sunday, May 16, 20212021-W19
W20Monday, May 17, 2021Sunday, May 23, 20212021-W20
W21Monday, May 24, 2021Sunday, May 30, 20212021-W21
W22Monday, May 31, 2021Sunday, June 6, 20212021-W22
W23Monday, June 7, 2021Sunday, June 13, 20212021-W23
W24Monday, June 14, 2021Sunday, June 20, 20212021-W24
W25Monday, June 21, 2021Sunday, June 27, 20212021-W25
W26Monday, June 28, 2021Sunday, July 4, 20212021-W26
W27Monday, July 5, 2021Sunday, July 11, 20212021-W27
W28Monday, July 12, 2021Sunday, July 18, 20212021-W28
W29Monday, July 19, 2021Sunday, July 25, 20212021-W29
W30Monday, July 26, 2021Sunday, August 1, 20212021-W30
W31Monday, August 2, 2021Sunday, August 8, 20212021-W31
W32Monday, August 9, 2021Sunday, August 15, 20212021-W32
W33Monday, August 16, 2021Sunday, August 22, 20212021-W33
W34Monday, August 23, 2021Sunday, August 29, 20212021-W34
W35Monday, August 30, 2021Sunday, September 5, 20212021-W35
W36Monday, September 6, 2021Sunday, September 12, 20212021-W36
W37Monday, September 13, 2021Sunday, September 19, 20212021-W37
W38Monday, September 20, 2021Sunday, September 26, 20212021-W38
W39Monday, September 27, 2021Sunday, October 3, 20212021-W39
W40Monday, October 4, 2021Sunday, October 10, 20212021-W40
W41Monday, October 11, 2021Sunday, October 17, 20212021-W41
W42Monday, October 18, 2021Sunday, October 24, 20212021-W42
W43Monday, October 25, 2021Sunday, October 31, 20212021-W43
W44Monday, November 1, 2021Sunday, November 7, 20212021-W44
W45Monday, November 8, 2021Sunday, November 14, 20212021-W45
W46Monday, November 15, 2021Sunday, November 21, 20212021-W46
W47Monday, November 22, 2021Sunday, November 28, 20212021-W47
W48Monday, November 29, 2021Sunday, December 5, 20212021-W48
W49Monday, December 6, 2021Sunday, December 12, 20212021-W49
W50Monday, December 13, 2021Sunday, December 19, 20212021-W50
W51Monday, December 20, 2021Sunday, December 26, 20212021-W51
W52Monday, December 27, 2021Sunday, January 2, 20222021-W52

Frequently asked questions

How many weeks are in 2021?

2021 contains exactly 52 ISO 8601 weeks.

Why do some years have 53 weeks?

An ISO year has 53 weeks when its first Thursday falls on January 1 (or January 1–2 in a leap year). Recent: 2009, 2015, 2020, 2026, 2032.

Is 2021 a leap year?

2021 is not a leap year (365 days).

Related tools

2021 calendar2021 facts2021 day of yearHow many weeks in a year