What week is it?
It is week
41
of 53 in 2026
Monday, October 5, 2026 – Sunday, October 11, 2026
Today is Wednesday, October 7, 2026 — day 3 of 7 in week 41. We use ISO 8601 week numbers: weeks start on Monday and week 1 is the week that contains the year's first Thursday. It is the standard across Europe and the one Excel returns with ISOWEEKNUM.
This week and the next few
ISO vs US week numbers
The US convention (Excel's WEEKNUM with default settings) starts week 1 on January 1 and starts weeks on Sunday, so it can be one number ahead of the ISO week — especially early in the year. Payroll and project tools vary; check which system yours uses before quoting a week number.
In Excel or Google Sheets
ISO week=ISOWEEKNUM(TODAY())
US week=WEEKNUM(TODAY())
What week is it right now?
Week 41 of 53 in 2026 (today is Wednesday, October 7, 2026). It runs from Monday, October 5, 2026 to Sunday, October 11, 2026.
How are week numbers calculated?
ISO 8601: weeks start on Monday and week 1 contains the year's first Thursday (equivalently, January 4). A year therefore has 52 or 53 weeks — 2026 has 53.
What is the Excel formula for the current week number?
=ISOWEEKNUM(TODAY()) gives the ISO week shown here; =WEEKNUM(TODAY()) uses the US Sunday-start system and can differ by one.
How many weeks are in 2026?
2026 has 53 ISO weeks. A year has 53 when it starts on a Thursday, or on a Wednesday in a leap year.