Week numbers 2025
2025 has 52 ISO calendar weeks. Week 1 starts on December 30, 2024; week 52 ends on December 28, 2025.
All week numbers 2025
| Week | From (Mon) | To (Sun) |
|---|---|---|
| 1 | Dec 30, 2024 | Jan 5, 2025 |
| 2 | Jan 6, 2025 | Jan 12, 2025 |
| 3 | Jan 13, 2025 | Jan 19, 2025 |
| 4 | Jan 20, 2025 | Jan 26, 2025 |
| 5 | Jan 27, 2025 | Feb 2, 2025 |
| 6 | Feb 3, 2025 | Feb 9, 2025 |
| 7 | Feb 10, 2025 | Feb 16, 2025 |
| 8 | Feb 17, 2025 | Feb 23, 2025 |
| 9 | Feb 24, 2025 | Mar 2, 2025 |
| 10 | Mar 3, 2025 | Mar 9, 2025 |
| 11 | Mar 10, 2025 | Mar 16, 2025 |
| 12 | Mar 17, 2025 | Mar 23, 2025 |
| 13 | Mar 24, 2025 | Mar 30, 2025 |
| 14 | Mar 31, 2025 | Apr 6, 2025 |
| 15 | Apr 7, 2025 | Apr 13, 2025 |
| 16 | Apr 14, 2025 | Apr 20, 2025 |
| 17 | Apr 21, 2025 | Apr 27, 2025 |
| 18 | Apr 28, 2025 | May 4, 2025 |
| 19 | May 5, 2025 | May 11, 2025 |
| 20 | May 12, 2025 | May 18, 2025 |
| 21 | May 19, 2025 | May 25, 2025 |
| 22 | May 26, 2025 | Jun 1, 2025 |
| 23 | Jun 2, 2025 | Jun 8, 2025 |
| 24 | Jun 9, 2025 | Jun 15, 2025 |
| 25 | Jun 16, 2025 | Jun 22, 2025 |
| 26 | Jun 23, 2025 | Jun 29, 2025 |
| 27 | Jun 30, 2025 | Jul 6, 2025 |
| 28 | Jul 7, 2025 | Jul 13, 2025 |
| 29 | Jul 14, 2025 | Jul 20, 2025 |
| 30 | Jul 21, 2025 | Jul 27, 2025 |
| 31 | Jul 28, 2025 | Aug 3, 2025 |
| 32 | Aug 4, 2025 | Aug 10, 2025 |
| 33 | Aug 11, 2025 | Aug 17, 2025 |
| 34 | Aug 18, 2025 | Aug 24, 2025 |
| 35 | Aug 25, 2025 | Aug 31, 2025 |
| 36 | Sep 1, 2025 | Sep 7, 2025 |
| 37 | Sep 8, 2025 | Sep 14, 2025 |
| 38 | Sep 15, 2025 | Sep 21, 2025 |
| 39 | Sep 22, 2025 | Sep 28, 2025 |
| 40 | Sep 29, 2025 | Oct 5, 2025 |
| 41 | Oct 6, 2025 | Oct 12, 2025 |
| 42 | Oct 13, 2025 | Oct 19, 2025 |
| 43 | Oct 20, 2025 | Oct 26, 2025 |
| 44 | Oct 27, 2025 | Nov 2, 2025 |
| 45 | Nov 3, 2025 | Nov 9, 2025 |
| 46 | Nov 10, 2025 | Nov 16, 2025 |
| 47 | Nov 17, 2025 | Nov 23, 2025 |
| 48 | Nov 24, 2025 | Nov 30, 2025 |
| 49 | Dec 1, 2025 | Dec 7, 2025 |
| 50 | Dec 8, 2025 | Dec 14, 2025 |
| 51 | Dec 15, 2025 | Dec 21, 2025 |
| 52 | Dec 22, 2025 | Dec 28, 2025 |
Other years
How week numbers work (ISO 8601)
Week numbers follow the international ISO 8601 standard: weeks start on Monday, and week 1 is the week that contains the first Thursday of January — equivalently, the week of January 4. That's why a year has 52 weeks in most years and 53 in some (like 2026), and why the last days of December can already belong to week 1 of the next year.
The United States and a few other countries traditionally count differently (weeks starting Sunday, week 1 containing January 1), so calendars can disagree by one. Business, logistics and schools in Europe use the ISO numbers shown here.