Week numbers for 2027
Complete ISO week-number calendar for 2027, with the Monday-to-Sunday date range for every week and links to detailed weekly schedules.
All 52 ISO weeks
Week 1Jan 4–Jan 10Week 2Jan 11–Jan 17Week 3Jan 18–Jan 24Week 4Jan 25–Jan 31Week 5Feb 1–Feb 7Week 6Feb 8–Feb 14Week 7Feb 15–Feb 21Week 8Feb 22–Feb 28Week 9Mar 1–Mar 7Week 10Mar 8–Mar 14Week 11Mar 15–Mar 21Week 12Mar 22–Mar 28Week 13Mar 29–Apr 4Week 14Apr 5–Apr 11Week 15Apr 12–Apr 18Week 16Apr 19–Apr 25Week 17Apr 26–May 2Week 18May 3–May 9Week 19May 10–May 16Week 20May 17–May 23Week 21May 24–May 30Week 22May 31–Jun 6Week 23Jun 7–Jun 13Week 24Jun 14–Jun 20Week 25Jun 21–Jun 27Week 26Jun 28–Jul 4Week 27Jul 5–Jul 11Week 28Jul 12–Jul 18Week 29Jul 19–Jul 25Week 30Jul 26–Aug 1Week 31Aug 2–Aug 8Week 32Aug 9–Aug 15Week 33Aug 16–Aug 22Week 34Aug 23–Aug 29Week 35Aug 30–Sep 5Week 36Sep 6–Sep 12Week 37Sep 13–Sep 19Week 38Sep 20–Sep 26Week 39Sep 27–Oct 3Week 40Oct 4–Oct 10Week 41Oct 11–Oct 17Week 42Oct 18–Oct 24Week 43Oct 25–Oct 31Week 44Nov 1–Nov 7Week 45Nov 8–Nov 14Week 46Nov 15–Nov 21Week 47Nov 22–Nov 28Week 48Nov 29–Dec 5Week 49Dec 6–Dec 12Week 50Dec 13–Dec 19Week 51Dec 20–Dec 26Week 52Dec 27–Jan 2
Using the 2027 week calendar
Each link opens a dedicated week page with the exact date range, all seven dates, weekday count and adjacent-week navigation. ISO week numbering is consistent across countries that use the ISO 8601 convention.