Week numbers for 2025
2025 has 52 weeks. Week 1 starts on Monday, December 30, 2024.
All weeks in 2025
| Week | Starts (Mon) | Ends (Sun) |
|---|---|---|
| Week 1 | Mon, Dec 30, 2024 | Sun, Jan 5, 2025 |
| Week 2 | Mon, Jan 6, 2025 | Sun, Jan 12, 2025 |
| Week 3 | Mon, Jan 13, 2025 | Sun, Jan 19, 2025 |
| Week 4 | Mon, Jan 20, 2025 | Sun, Jan 26, 2025 |
| Week 5 | Mon, Jan 27, 2025 | Sun, Feb 2, 2025 |
| Week 6 | Mon, Feb 3, 2025 | Sun, Feb 9, 2025 |
| Week 7 | Mon, Feb 10, 2025 | Sun, Feb 16, 2025 |
| Week 8 | Mon, Feb 17, 2025 | Sun, Feb 23, 2025 |
| Week 9 | Mon, Feb 24, 2025 | Sun, Mar 2, 2025 |
| Week 10 | Mon, Mar 3, 2025 | Sun, Mar 9, 2025 |
| Week 11 | Mon, Mar 10, 2025 | Sun, Mar 16, 2025 |
| Week 12 | Mon, Mar 17, 2025 | Sun, Mar 23, 2025 |
| Week 13 | Mon, Mar 24, 2025 | Sun, Mar 30, 2025 |
| Week 14 | Mon, Mar 31, 2025 | Sun, Apr 6, 2025 |
| Week 15 | Mon, Apr 7, 2025 | Sun, Apr 13, 2025 |
| Week 16 | Mon, Apr 14, 2025 | Sun, Apr 20, 2025 |
| Week 17 | Mon, Apr 21, 2025 | Sun, Apr 27, 2025 |
| Week 18 | Mon, Apr 28, 2025 | Sun, May 4, 2025 |
| Week 19 | Mon, May 5, 2025 | Sun, May 11, 2025 |
| Week 20 | Mon, May 12, 2025 | Sun, May 18, 2025 |
| Week 21 | Mon, May 19, 2025 | Sun, May 25, 2025 |
| Week 22 | Mon, May 26, 2025 | Sun, Jun 1, 2025 |
| Week 23 | Mon, Jun 2, 2025 | Sun, Jun 8, 2025 |
| Week 24 | Mon, Jun 9, 2025 | Sun, Jun 15, 2025 |
| Week 25 | Mon, Jun 16, 2025 | Sun, Jun 22, 2025 |
| Week 26 | Mon, Jun 23, 2025 | Sun, Jun 29, 2025 |
| Week 27 | Mon, Jun 30, 2025 | Sun, Jul 6, 2025 |
| Week 28 | Mon, Jul 7, 2025 | Sun, Jul 13, 2025 |
| Week 29 | Mon, Jul 14, 2025 | Sun, Jul 20, 2025 |
| Week 30 | Mon, Jul 21, 2025 | Sun, Jul 27, 2025 |
| Week 31 | Mon, Jul 28, 2025 | Sun, Aug 3, 2025 |
| Week 32 | Mon, Aug 4, 2025 | Sun, Aug 10, 2025 |
| Week 33 | Mon, Aug 11, 2025 | Sun, Aug 17, 2025 |
| Week 34 | Mon, Aug 18, 2025 | Sun, Aug 24, 2025 |
| Week 35 | Mon, Aug 25, 2025 | Sun, Aug 31, 2025 |
| Week 36 | Mon, Sep 1, 2025 | Sun, Sep 7, 2025 |
| Week 37 | Mon, Sep 8, 2025 | Sun, Sep 14, 2025 |
| Week 38 | Mon, Sep 15, 2025 | Sun, Sep 21, 2025 |
| Week 39 | Mon, Sep 22, 2025 | Sun, Sep 28, 2025 |
| Week 40 | Mon, Sep 29, 2025 | Sun, Oct 5, 2025 |
| Week 41 | Mon, Oct 6, 2025 | Sun, Oct 12, 2025 |
| Week 42 | Mon, Oct 13, 2025 | Sun, Oct 19, 2025 |
| Week 43 | Mon, Oct 20, 2025 | Sun, Oct 26, 2025 |
| Week 44 | Mon, Oct 27, 2025 | Sun, Nov 2, 2025 |
| Week 45 | Mon, Nov 3, 2025 | Sun, Nov 9, 2025 |
| Week 46 | Mon, Nov 10, 2025 | Sun, Nov 16, 2025 |
| Week 47 | Mon, Nov 17, 2025 | Sun, Nov 23, 2025 |
| Week 48 | Mon, Nov 24, 2025 | Sun, Nov 30, 2025 |
| Week 49 | Mon, Dec 1, 2025 | Sun, Dec 7, 2025 |
| Week 50 | Mon, Dec 8, 2025 | Sun, Dec 14, 2025 |
| Week 51 | Mon, Dec 15, 2025 | Sun, Dec 21, 2025 |
| Week 52 | Mon, Dec 22, 2025 | Sun, Dec 28, 2025 |
Other years
Questions & answers
What week number is it today?
Today, October 3, 2026, is in ISO week 40 of 2026.
How many weeks are in 2025?
2025 has 52 ISO weeks.
When does the week start?
ISO weeks start on Monday and end on Sunday. Week 1 is the week with the year's first Thursday in it, so it can begin in late December.