Week Tool
What Week Is It?
Week Number Calculator — find the current week, look up any date, or discover when a week starts.
Current Week
Week 26
of 2026 · 53 weeks this year
Week 149.1% through the yearWeek 53
What week number is...?
ISO Week: 26 of 2026
US Week: 26
When does week ___ start?
Mon, Jun 22, 2026 — Sun, Jun 28, 2026
2026 Week Calendar
Click a week to see its date range above.
Week Numbers for the Next 12 Months
Jun 2026
Weeks: 23, 24, 25, 26, 27
Jul 2026
Weeks: 27, 28, 29, 30, 31
Aug 2026
Weeks: 31, 32, 33, 34, 35, 36
Sep 2026
Weeks: 36, 37, 38, 39, 40
Oct 2026
Weeks: 40, 41, 42, 43, 44
Nov 2026
Weeks: 44, 45, 46, 47, 48, 49
Dec 2026
Weeks: 49, 50, 51, 52, 53
Jan 2027
Weeks: 1, 2, 3, 4, 53
Feb 2027
Weeks: 5, 6, 7, 8
Mar 2027
Weeks: 9, 10, 11, 12, 13
Apr 2027
Weeks: 13, 14, 15, 16, 17
May 2027
Weeks: 17, 18, 19, 20, 21, 22
ISO vs US Week Numbering
ISO 8601 (International)
- • Weeks start on Monday
- • Week 1 contains the first Thursday of the year
- • Used by most of Europe, Asia, and international business
- • A year has 52 or 53 weeks
US / North American
- • Weeks start on Sunday
- • Week 1 begins on January 1 regardless of day
- • Used in the United States, Canada, and some others
- • A year can have 53 or 54 weeks