Week numbers 2025
All 52 ISO weeks of 2025 with their exact dates. 2025 starts on a Wednesday, has 365 days, and counts 52 calendar weeks. Week 1 begins Dec 30, 2024; week 52 ends Dec 28, 2025.
2025 has 52 ISO weeks. Week 1: Dec 30 – Jan 5, 2025. Week 52: Dec 22 – Dec 28, 2025.
Week number chart 2025
| Week number | From (Monday) | To (Sunday) | Month | Quarter |
|---|---|---|---|---|
| Week 1 | Dec 30, 2024 | Jan 5 | Dec / Jan | Q1 |
| Week 2 | Jan 6 | Jan 12 | January | Q1 |
| Week 3 | Jan 13 | Jan 19 | January | Q1 |
| Week 4 | Jan 20 | Jan 26 | January | Q1 |
| Week 5 | Jan 27 | Feb 2 | Jan / Feb | Q1 |
| Week 6 | Feb 3 | Feb 9 | February | Q1 |
| Week 7 | Feb 10 | Feb 16 | February | Q1 |
| Week 8 | Feb 17 | Feb 23 | February | Q1 |
| Week 9 | Feb 24 | Mar 2 | Feb / Mar | Q1 |
| Week 10 | Mar 3 | Mar 9 | March | Q1 |
| Week 11 | Mar 10 | Mar 16 | March | Q1 |
| Week 12 | Mar 17 | Mar 23 | March | Q1 |
| Week 13 | Mar 24 | Mar 30 | March | Q1 |
| Week 14 | Mar 31 | Apr 6 | Mar / Apr | Q2 |
| Week 15 | Apr 7 | Apr 13 | April | Q2 |
| Week 16 | Apr 14 | Apr 20 | April | Q2 |
| Week 17 | Apr 21 | Apr 27 | April | Q2 |
| Week 18 | Apr 28 | May 4 | Apr / May | Q2 |
| Week 19 | May 5 | May 11 | May | Q2 |
| Week 20 | May 12 | May 18 | May | Q2 |
| Week 21 | May 19 | May 25 | May | Q2 |
| Week 22 | May 26 | Jun 1 | May / Jun | Q2 |
| Week 23 | Jun 2 | Jun 8 | June | Q2 |
| Week 24 | Jun 9 | Jun 15 | June | Q2 |
| Week 25 | Jun 16 | Jun 22 | June | Q2 |
| Week 26 | Jun 23 | Jun 29 | June | Q2 |
| Week 27 | Jun 30 | Jul 6 | Jun / Jul | Q3 |
| Week 28 | Jul 7 | Jul 13 | July | Q3 |
| Week 29 | Jul 14 | Jul 20 | July | Q3 |
| Week 30 | Jul 21 | Jul 27 | July | Q3 |
| Week 31 | Jul 28 | Aug 3 | Jul / Aug | Q3 |
| Week 32 | Aug 4 | Aug 10 | August | Q3 |
| Week 33 | Aug 11 | Aug 17 | August | Q3 |
| Week 34 | Aug 18 | Aug 24 | August | Q3 |
| Week 35 | Aug 25 | Aug 31 | August | Q3 |
| Week 36 | Sep 1 | Sep 7 | September | Q3 |
| Week 37 | Sep 8 | Sep 14 | September | Q3 |
| Week 38 | Sep 15 | Sep 21 | September | Q3 |
| Week 39 | Sep 22 | Sep 28 | September | Q3 |
| Week 40 | Sep 29 | Oct 5 | Sep / Oct | Q4 |
| Week 41 | Oct 6 | Oct 12 | October | Q4 |
| Week 42 | Oct 13 | Oct 19 | October | Q4 |
| Week 43 | Oct 20 | Oct 26 | October | Q4 |
| Week 44 | Oct 27 | Nov 2 | Oct / Nov | Q4 |
| Week 45 | Nov 3 | Nov 9 | November | Q4 |
| Week 46 | Nov 10 | Nov 16 | November | Q4 |
| Week 47 | Nov 17 | Nov 23 | November | Q4 |
| Week 48 | Nov 24 | Nov 30 | November | Q4 |
| Week 49 | Dec 1 | Dec 7 | December | Q4 |
| Week 50 | Dec 8 | Dec 14 | December | Q4 |
| Week 51 | Dec 15 | Dec 21 | December | Q4 |
| Week 52 | Dec 22 | Dec 28 | December | Q4 |
Note that week 1 of 2025 starts on Dec 30, 2024 — the last days of December 2024 belong to 2025's week 1 under ISO rules. Weeks follow ISO 8601 (Monday start, week 1 contains January 4).
Other years
Frequently asked questions
How many weeks does 2025 have?
2025 has 52 ISO weeks. Like most years it has 52 numbered weeks; the nearest 53-week years are 2020, 2026, 2032.
When does week 1 of 2025 start?
Week 1 of 2025 runs from Monday, Dec 30, 2024 to Sunday, Jan 5, 2025 — it is the week containing January 4. 2025 itself begins on a Wednesday.
When does the last week of 2025 end?
Week 52, the final week of 2025, runs from Dec 22, 2025 to Dec 28, 2025.
Is 2025 a leap year?
No — 2025 has 365 days, which is 52 weeks and 1 day.