2025 ISO Week Number Calendar
2025 has 52 ISO weeks. Weeks run Monday – Sunday per ISO 8601 standard.
| Week # | Mon (Start) | Sun (End) | Month | Days | |
|---|---|---|---|---|---|
| Week 1 | Dec 30 | Jan 5 | January* | 7 | Details → |
| Week 2 | Jan 6 | Jan 12 | January | 7 | Details → |
| Week 3 | Jan 13 | Jan 19 | January | 7 | Details → |
| Week 4 | Jan 20 | Jan 26 | January | 7 | Details → |
| Week 5 | Jan 27 | Feb 2 | January* | 7 | Details → |
| Week 6 | Feb 3 | Feb 9 | February | 7 | Details → |
| Week 7 | Feb 10 | Feb 16 | February | 7 | Details → |
| Week 8 | Feb 17 | Feb 23 | February | 7 | Details → |
| Week 9 | Feb 24 | Mar 2 | February* | 7 | Details → |
| Week 10 | Mar 3 | Mar 9 | March | 7 | Details → |
| Week 11 | Mar 10 | Mar 16 | March | 7 | Details → |
| Week 12 | Mar 17 | Mar 23 | March | 7 | Details → |
| Week 13 | Mar 24 | Mar 30 | March | 7 | Details → |
| Week 14 | Mar 31 | Apr 6 | April* | 7 | Details → |
| Week 15 | Apr 7 | Apr 13 | April | 7 | Details → |
| Week 16 | Apr 14 | Apr 20 | April | 7 | Details → |
| Week 17 | Apr 21 | Apr 27 | April | 7 | Details → |
| Week 18 | Apr 28 | May 4 | May* | 7 | Details → |
| Week 19 | May 5 | May 11 | May | 7 | Details → |
| Week 20 | May 12 | May 18 | May | 7 | Details → |
| Week 21 | May 19 | May 25 | May | 7 | Details → |
| Week 22 | May 26 | Jun 1 | May* | 7 | Details → |
| Week 23 | Jun 2 | Jun 8 | June | 7 | Details → |
| Week 24 | Jun 9 | Jun 15 | June | 7 | Details → |
| Week 25 | Jun 16 | Jun 22 | June | 7 | Details → |
| Week 26 | Jun 23 | Jun 29 | June | 7 | Details → |
| Week 27 | Jun 30 | Jul 6 | July* | 7 | Details → |
| Week 28 | Jul 7 | Jul 13 | July | 7 | Details → |
| Week 29 | Jul 14 | Jul 20 | July | 7 | Details → |
| Week 30 | Jul 21 | Jul 27 | July | 7 | Details → |
| Week 31 | Jul 28 | Aug 3 | July* | 7 | Details → |
| Week 32 | Aug 4 | Aug 10 | August | 7 | Details → |
| Week 33 | Aug 11 | Aug 17 | August | 7 | Details → |
| Week 34 | Aug 18 | Aug 24 | August | 7 | Details → |
| Week 35 | Aug 25 | Aug 31 | August | 7 | Details → |
| Week 36 | Sep 1 | Sep 7 | September | 7 | Details → |
| Week 37 | Sep 8 | Sep 14 | September | 7 | Details → |
| Week 38 | Sep 15 | Sep 21 | September | 7 | Details → |
| Week 39 | Sep 22 | Sep 28 | September | 7 | Details → |
| Week 40 | Sep 29 | Oct 5 | October* | 7 | Details → |
| Week 41 | Oct 6 | Oct 12 | October | 7 | Details → |
| Week 42 | Oct 13 | Oct 19 | October | 7 | Details → |
| Week 43 | Oct 20 | Oct 26 | October | 7 | Details → |
| Week 44 | Oct 27 | Nov 2 | October* | 7 | Details → |
| Week 45 | Nov 3 | Nov 9 | November | 7 | Details → |
| Week 46 | Nov 10 | Nov 16 | November | 7 | Details → |
| Week 47 | Nov 17 | Nov 23 | November | 7 | Details → |
| Week 48 | Nov 24 | Nov 30 | November | 7 | Details → |
| Week 49 | Dec 1 | Dec 7 | December | 7 | Details → |
| Week 50 | Dec 8 | Dec 14 | December | 7 | Details → |
| Week 51 | Dec 15 | Dec 21 | December | 7 | Details → |
| Week 52 | Dec 22 | Dec 28 | December | 7 | Details → |
