Week Number Calculator
Calculate ISO 8601 week numbers for any date
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Week 3
Thursday, January 15, 2026
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Reconcile timesheets, convert decimal hours, and monitor overtime across complex schedules.
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Enter a week number and year to find the date range
All Weeks in 2026
| Week | Start Date | End Date |
|---|---|---|
| Week 1 | Dec 29, 2025 | Jan 4, 2026 |
| Week 2 | Jan 5, 2026 | Jan 11, 2026 |
| Week 3 | Jan 12, 2026 | Jan 18, 2026 |
| Week 4 | Jan 19, 2026 | Jan 25, 2026 |
| Week 5 | Jan 26, 2026 | Feb 1, 2026 |
| Week 6 | Feb 2, 2026 | Feb 8, 2026 |
| Week 7 | Feb 9, 2026 | Feb 15, 2026 |
| Week 8 | Feb 16, 2026 | Feb 22, 2026 |
| Week 9 | Feb 23, 2026 | Mar 1, 2026 |
| Week 10 | Mar 2, 2026 | Mar 8, 2026 |
| Week 11 | Mar 9, 2026 | Mar 15, 2026 |
| Week 12 | Mar 16, 2026 | Mar 22, 2026 |
| Week 13 | Mar 23, 2026 | Mar 29, 2026 |
| Week 14 | Mar 30, 2026 | Apr 5, 2026 |
| Week 15 | Apr 6, 2026 | Apr 12, 2026 |
| Week 16 | Apr 13, 2026 | Apr 19, 2026 |
| Week 17 | Apr 20, 2026 | Apr 26, 2026 |
| Week 18 | Apr 27, 2026 | May 3, 2026 |
| Week 19 | May 4, 2026 | May 10, 2026 |
| Week 20 | May 11, 2026 | May 17, 2026 |
| Week 21 | May 18, 2026 | May 24, 2026 |
| Week 22 | May 25, 2026 | May 31, 2026 |
| Week 23 | Jun 1, 2026 | Jun 7, 2026 |
| Week 24 | Jun 8, 2026 | Jun 14, 2026 |
| Week 25 | Jun 15, 2026 | Jun 21, 2026 |
| Week 26 | Jun 22, 2026 | Jun 28, 2026 |
| Week 27 | Jun 29, 2026 | Jul 5, 2026 |
| Week 28 | Jul 6, 2026 | Jul 12, 2026 |
| Week 29 | Jul 13, 2026 | Jul 19, 2026 |
| Week 30 | Jul 20, 2026 | Jul 26, 2026 |
| Week 31 | Jul 27, 2026 | Aug 2, 2026 |
| Week 32 | Aug 3, 2026 | Aug 9, 2026 |
| Week 33 | Aug 10, 2026 | Aug 16, 2026 |
| Week 34 | Aug 17, 2026 | Aug 23, 2026 |
| Week 35 | Aug 24, 2026 | Aug 30, 2026 |
| Week 36 | Aug 31, 2026 | Sep 6, 2026 |
| Week 37 | Sep 7, 2026 | Sep 13, 2026 |
| Week 38 | Sep 14, 2026 | Sep 20, 2026 |
| Week 39 | Sep 21, 2026 | Sep 27, 2026 |
| Week 40 | Sep 28, 2026 | Oct 4, 2026 |
| Week 41 | Oct 5, 2026 | Oct 11, 2026 |
| Week 42 | Oct 12, 2026 | Oct 18, 2026 |
| Week 43 | Oct 19, 2026 | Oct 25, 2026 |
| Week 44 | Oct 26, 2026 | Nov 1, 2026 |
| Week 45 | Nov 2, 2026 | Nov 8, 2026 |
| Week 46 | Nov 9, 2026 | Nov 15, 2026 |
| Week 47 | Nov 16, 2026 | Nov 22, 2026 |
| Week 48 | Nov 23, 2026 | Nov 29, 2026 |
| Week 49 | Nov 30, 2026 | Dec 6, 2026 |
| Week 50 | Dec 7, 2026 | Dec 13, 2026 |
| Week 51 | Dec 14, 2026 | Dec 20, 2026 |
| Week 52 | Dec 21, 2026 | Dec 27, 2026 |
| Week 53 | Dec 28, 2026 | Jan 3, 2027 |