Week Number Calculator

Calendar weeks 2025 - CW 2025

Week Numbers ﹣ Calendar weeks 2025

The following table shows all ISO calendar weeks 2025 from 1 to 53, with their start date beginning on Monday and their end date falling on Sunday.

European and Asian ISO calendar weeks 2025 - CW 2025
CW Mo Tu We Th Fr Sa SuISO-Name
CW 1 30/12 31/12 01/01 02/01 03/01 04/01 05/012025‑W01
CW 2 06/01 07/01 08/01 09/01 10/01 11/01 12/012025‑W02
CW 3 13/01 14/01 15/01 16/01 17/01 18/01 19/012025‑W03
CW 4 20/01 21/01 22/01 23/01 24/01 25/01 26/012025‑W04
CW 5 27/01 28/01 29/01 30/01 31/01 01/02 02/022025‑W05
CW 6 03/02 04/02 05/02 06/02 07/02 08/02 09/022025‑W06
CW 7 10/02 11/02 12/02 13/02 14/02 15/02 16/022025‑W07
CW 8 17/02 18/02 19/02 20/02 21/02 22/02 23/022025‑W08
CW 9 24/02 25/02 26/02 27/02 28/02 01/03 02/032025‑W09
CW 10 03/03 04/03 05/03 06/03 07/03 08/03 09/032025‑W10
CW 11 10/03 11/03 12/03 13/03 14/03 15/03 16/032025‑W11
CW 12 17/03 18/03 19/03 20/03 21/03 22/03 23/032025‑W12
CW 13 24/03 25/03 26/03 27/03 28/03 29/03 30/032025‑W13
CW 14 31/03 01/04 02/04 03/04 04/04 05/04 06/042025‑W14
CW 15 07/04 08/04 09/04 10/04 11/04 12/04 13/042025‑W15
CW 16 14/04 15/04 16/04 17/04 18/04 19/04 20/042025‑W16
CW 17 21/04 22/04 23/04 24/04 25/04 26/04 27/042025‑W17
CW 18 28/04 29/04 30/04 01/05 02/05 03/05 04/052025‑W18
CW 19 05/05 06/05 07/05 08/05 09/05 10/05 11/052025‑W19
CW 20 12/05 13/05 14/05 15/05 16/05 17/05 18/052025‑W20
CW 21 19/05 20/05 21/05 22/05 23/05 24/05 25/052025‑W21
CW 22 26/05 27/05 28/05 29/05 30/05 31/05 01/062025‑W22
CW 23 02/06 03/06 04/06 05/06 06/06 07/06 08/062025‑W23
CW 24 09/06 10/06 11/06 12/06 13/06 14/06 15/062025‑W24
CW 25 16/06 17/06 18/06 19/06 20/06 21/06 22/062025‑W25
CW 26 23/06 24/06 25/06 26/06 27/06 28/06 29/062025‑W26
CW 27 30/06 01/07 02/07 03/07 04/07 05/07 06/072025‑W27
CW 28 07/07 08/07 09/07 10/07 11/07 12/07 13/072025‑W28
CW 29 14/07 15/07 16/07 17/07 18/07 19/07 20/072025‑W29
CW 30 21/07 22/07 23/07 24/07 25/07 26/07 27/072025‑W30
CW 31 28/07 29/07 30/07 31/07 01/08 02/08 03/082025‑W31
CW 32 04/08 05/08 06/08 07/08 08/08 09/08 10/082025‑W32
CW 33 11/08 12/08 13/08 14/08 15/08 16/08 17/082025‑W33
CW 34 18/08 19/08 20/08 21/08 22/08 23/08 24/082025‑W34
CW 35 25/08 26/08 27/08 28/08 29/08 30/08 31/082025‑W35
CW 36 01/09 02/09 03/09 04/09 05/09 06/09 07/092025‑W36
CW 37 08/09 09/09 10/09 11/09 12/09 13/09 14/092025‑W37
CW 38 15/09 16/09 17/09 18/09 19/09 20/09 21/092025‑W38
CW 39 22/09 23/09 24/09 25/09 26/09 27/09 28/092025‑W39
CW 40 29/09 30/09 01/10 02/10 03/10 04/10 05/102025‑W40
CW 41 06/10 07/10 08/10 09/10 10/10 11/10 12/102025‑W41
CW 42 13/10 14/10 15/10 16/10 17/10 18/10 19/102025‑W42
CW 43 20/10 21/10 22/10 23/10 24/10 25/10 26/102025‑W43
CW 44 27/10 28/10 29/10 30/10 31/10 01/11 02/112025‑W44
CW 45 03/11 04/11 05/11 06/11 07/11 08/11 09/112025‑W45
CW 46 10/11 11/11 12/11 13/11 14/11 15/11 16/112025‑W46
CW 47 17/11 18/11 19/11 20/11 21/11 22/11 23/112025‑W47
CW 48 24/11 25/11 26/11 27/11 28/11 29/11 30/112025‑W48
CW 49 01/12 02/12 03/12 04/12 05/12 06/12 07/122025‑W49
CW 50 08/12 09/12 10/12 11/12 12/12 13/12 14/122025‑W50
CW 51 15/12 16/12 17/12 18/12 19/12 20/12 21/122025‑W51
CW 52 22/12 23/12 24/12 25/12 26/12 27/12 28/122025‑W52
CW 53 2025 does not exist week 53. 2025 has only 52 calendar weeks.

The ISO calendar weeks for 2025 are defined according to the international ISO standard. That is, each calendar week starts on Monday and ends on Sunday. Even during the change of year, a new calendar week starts on Monday and ends on Sunday. The ISO standard specifies that the majority of the first calendar week (i.e., at least four days) must lie in the new year.

Table of all American calendar weeks for 2025

The following table shows all "American" calendar weeks 2025, with their start date beginning on Sunday and their end date falling on Saturday.

American calendar weeks 2025 - CW 2025
CW Su Mo Tu We Th Fr Sa
CW 101/0102/0103/0104/01
CW 2 05/01 06/01 07/01 08/01 09/01 10/01 11/01
CW 3 12/01 13/01 14/01 15/01 16/01 17/01 18/01
CW 4 19/01 20/01 21/01 22/01 23/01 24/01 25/01
CW 5 26/01 27/01 28/01 29/01 30/01 31/01 01/02
CW 6 02/02 03/02 04/02 05/02 06/02 07/02 08/02
CW 7 09/02 10/02 11/02 12/02 13/02 14/02 15/02
CW 8 16/02 17/02 18/02 19/02 20/02 21/02 22/02
CW 9 23/02 24/02 25/02 26/02 27/02 28/02 01/03
CW 10 02/03 03/03 04/03 05/03 06/03 07/03 08/03
CW 11 09/03 10/03 11/03 12/03 13/03 14/03 15/03
CW 12 16/03 17/03 18/03 19/03 20/03 21/03 22/03
CW 13 23/03 24/03 25/03 26/03 27/03 28/03 29/03
CW 14 30/03 31/03 01/04 02/04 03/04 04/04 05/04
CW 15 06/04 07/04 08/04 09/04 10/04 11/04 12/04
CW 16 13/04 14/04 15/04 16/04 17/04 18/04 19/04
CW 17 20/04 21/04 22/04 23/04 24/04 25/04 26/04
CW 18 27/04 28/04 29/04 30/04 01/05 02/05 03/05
CW 19 04/05 05/05 06/05 07/05 08/05 09/05 10/05
CW 20 11/05 12/05 13/05 14/05 15/05 16/05 17/05
CW 21 18/05 19/05 20/05 21/05 22/05 23/05 24/05
CW 22 25/05 26/05 27/05 28/05 29/05 30/05 31/05
CW 23 01/06 02/06 03/06 04/06 05/06 06/06 07/06
CW 24 08/06 09/06 10/06 11/06 12/06 13/06 14/06
CW 25 15/06 16/06 17/06 18/06 19/06 20/06 21/06
CW 26 22/06 23/06 24/06 25/06 26/06 27/06 28/06
CW 27 29/06 30/06 01/07 02/07 03/07 04/07 05/07
CW 28 06/07 07/07 08/07 09/07 10/07 11/07 12/07
CW 29 13/07 14/07 15/07 16/07 17/07 18/07 19/07
CW 30 20/07 21/07 22/07 23/07 24/07 25/07 26/07
CW 31 27/07 28/07 29/07 30/07 31/07 01/08 02/08
CW 32 03/08 04/08 05/08 06/08 07/08 08/08 09/08
CW 33 10/08 11/08 12/08 13/08 14/08 15/08 16/08
CW 34 17/08 18/08 19/08 20/08 21/08 22/08 23/08
CW 35 24/08 25/08 26/08 27/08 28/08 29/08 30/08
CW 36 31/08 01/09 02/09 03/09 04/09 05/09 06/09
CW 37 07/09 08/09 09/09 10/09 11/09 12/09 13/09
CW 38 14/09 15/09 16/09 17/09 18/09 19/09 20/09
CW 39 21/09 22/09 23/09 24/09 25/09 26/09 27/09
CW 40 28/09 29/09 30/09 01/10 02/10 03/10 04/10
CW 41 05/10 06/10 07/10 08/10 09/10 10/10 11/10
CW 42 12/10 13/10 14/10 15/10 16/10 17/10 18/10
CW 43 19/10 20/10 21/10 22/10 23/10 24/10 25/10
CW 44 26/10 26/10 27/10 28/10 29/10 30/10 31/10
CW 45 02/11 03/11 04/11 05/11 06/11 07/11 08/11
CW 46 09/11 10/11 11/11 12/11 13/11 14/11 15/11
CW 47 16/11 17/11 18/11 19/11 20/11 21/11 22/11
CW 48 23/11 24/11 25/11 26/11 27/11 28/11 29/11
CW 49 30/11 01/12 02/12 03/12 04/12 05/12 06/12
CW 50 07/12 08/12 09/12 10/12 11/12 12/12 13/12
CW 51 14/12 15/12 16/12 17/12 18/12 19/12 20/12
CW 52 21/12 22/12 23/12 24/12 25/12 26/12 27/12
CW 5328/1229/1230/1231/12

The "American" calendar weeks for 2025 are used in the USA, Canada and most Latin American countries, Australia, Japan, Israel, South Korea and others. Unlike the otherwise internationally standardised ISO weeks, the American calendar weeks start on Sundays instead of Mondays and end on Saturdays. However, the first calendar week always begins on the 1st of January and the last always ends on the 31st of December. These two weeks can have fewer than seven days. There are always 53 calendar weeks, except in a leap year where 31st December is a Sunday. As a result, such a year will have 54 calendar weeks.

Calculation of any calendar weeks 2025

Source information

As source for the information in the 'Week Numbers' category, we have used in particular:

Last update on January 27, 2023

The pages of the 'Week Numbers' category were last editorially reviewed by Michael Mühl on January 27, 2023. They all correspond to the current status.

Previous changes on June 25, 2021