Current week
46
Today, Sunday, November 15, 2026, is in week 46 of 2026.
Week 46 runs from Monday, November 9, 2026 to Sunday, November 15, 2026.
ISO week or US week?
In ISO 8601, weeks start on Monday and week 1 is the week containing the year's first Thursday (so it always contains January 4). A year has 52 or 53 weeks, and the first days of January can belong to the last week of the previous year. The common US system starts weeks on Sunday and makes the week containing January 1 week 1, so its number can be one higher.
Weeks of 2026
2026 has 53 ISO weeks. Week 1 starts on Monday, December 29, 2025 and the last week ends on Sunday, January 3, 2027.
| Week | Starts (Monday) | Ends (Sunday) |
|---|---|---|
| Week 1 | ||
| Week 2 | ||
| Week 3 | ||
| Week 4 | ||
| Week 5 | ||
| Week 6 | ||
| Week 7 | ||
| Week 8 | ||
| Week 9 | ||
| Week 10 | ||
| Week 11 | ||
| Week 12 | ||
| Week 13 | ||
| Week 14 | ||
| Week 15 | ||
| Week 16 | ||
| Week 17 | ||
| Week 18 | ||
| Week 19 | ||
| Week 20 | ||
| Week 21 | ||
| Week 22 | ||
| Week 23 | ||
| Week 24 | ||
| Week 25 | ||
| Week 26 | ||
| Week 27 | ||
| Week 28 | ||
| Week 29 | ||
| Week 30 | ||
| Week 31 | ||
| Week 32 | ||
| Week 33 | ||
| Week 34 | ||
| Week 35 | ||
| Week 36 | ||
| Week 37 | ||
| Week 38 | ||
| Week 39 | ||
| Week 40 | ||
| Week 41 | ||
| Week 42 | ||
| Week 43 | ||
| Week 44 | ||
| Week 45 | ||
| Week 46 | ||
| Week 47 | ||
| Week 48 | ||
| Week 49 | ||
| Week 50 | ||
| Week 51 | ||
| Week 52 | ||
| Week 53 |
How to find the week number
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1
See the current week
Today's week number is shown at the top, with the Monday it starts on and the Sunday it ends on.
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2
Look up a date
In "Which week is a date in?", pick any day to see its ISO week number and the US-style week number.
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3
Look up a week
In "Which dates are in a week?", type a week number and a year to see the dates it starts and ends.
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4
Use the year table
Further down you will find every week of the year with its dates, with the current week highlighted.
How ISO 8601 week numbers work
The international standard ISO 8601 says weeks start on Monday and that week 1 is the week containing the first Thursday of the year. In practice, week 1 is always the week that contains January 4, and every week belongs entirely to one numbering year.
Because of this rule a year has 52 or 53 weeks. January 1–3 can belong to week 52 or 53 of the previous year, and the last days of December can already be in week 1 of the next year. This is the numbering used in business planners, manufacturing, logistics and most of Europe.
ISO weeks vs US week numbers
The system common in the United States starts weeks on Sunday and calls the week containing January 1 week 1, even if it has only one or two days. Its number is often one higher than the ISO week. The date lookup shows both numbers so you can match whichever system your team uses.
In Excel and Google Sheets, ISOWEEKNUM returns the ISO number shown on this page; WEEKNUM uses the US system by default.
- Production and delivery planning by week
- Sprints and weekly reports
- Shift rotas and schedules
- School and fiscal calendars
Week numbers: frequently asked questions
What week is it?
The current week number is shown at the top of this page, calculated from your device's date with the ISO 8601 standard, along with the week's start and end dates.
How many weeks are in a year?
Under ISO 8601, 52 or 53. A year has 53 weeks when it starts on a Thursday, or on a Wednesday in a leap year. 2026 is one of them.
Do weeks start on Sunday or Monday?
ISO weeks, used on this page, start on Monday. US calendars usually start on Sunday, which can give a different week number.
How do I get the week number in Excel?
Use =ISOWEEKNUM(A1) for the ISO week, the same as this page. =WEEKNUM(A1) counts weeks starting on Sunday and may give a different number.
Why is January 1 in week 53?
Because ISO week 1 is the week containing the year's first Thursday. When January 1 falls on a Friday, Saturday or Sunday, those days still belong to the last week of the previous year.