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Week Number Calculator

The current week number is at the top. Below, turn any date into its week number or find the Monday and Sunday of any week, plus a list of every week in the year.

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All week numbers

Last checked: 21 October 2026

Week numbers 2027 at a glance

2027 has 52 weeks. Week 1 starts on Monday 4 January 2027 and week 52 ends on Sunday 2 January 2028. The table follows ISO 8601, the standard used in the UK and most of Europe.

WeekMondaySundayMonth
Week 1Mon, 4 Jan 2027Sun, 10 Jan 2027January
Week 2Mon, 11 Jan 2027Sun, 17 Jan 2027January
Week 3Mon, 18 Jan 2027Sun, 24 Jan 2027January
Week 4Mon, 25 Jan 2027Sun, 31 Jan 2027January
Week 5Mon, 1 Feb 2027Sun, 7 Feb 2027February
Week 6Mon, 8 Feb 2027Sun, 14 Feb 2027February
Week 7Mon, 15 Feb 2027Sun, 21 Feb 2027February
Week 8Mon, 22 Feb 2027Sun, 28 Feb 2027February
Week 9Mon, 1 Mar 2027Sun, 7 Mar 2027March
Week 10Mon, 8 Mar 2027Sun, 14 Mar 2027March
Week 11Mon, 15 Mar 2027Sun, 21 Mar 2027March
Week 12Mon, 22 Mar 2027Sun, 28 Mar 2027March
Week 13Mon, 29 Mar 2027Sun, 4 Apr 2027March
Week 14Mon, 5 Apr 2027Sun, 11 Apr 2027April
Week 15Mon, 12 Apr 2027Sun, 18 Apr 2027April
Week 16Mon, 19 Apr 2027Sun, 25 Apr 2027April
Week 17Mon, 26 Apr 2027Sun, 2 May 2027April
Week 18Mon, 3 May 2027Sun, 9 May 2027May
Week 19Mon, 10 May 2027Sun, 16 May 2027May
Week 20Mon, 17 May 2027Sun, 23 May 2027May
Week 21Mon, 24 May 2027Sun, 30 May 2027May
Week 22Mon, 31 May 2027Sun, 6 Jun 2027May
Week 23Mon, 7 Jun 2027Sun, 13 Jun 2027June
Week 24Mon, 14 Jun 2027Sun, 20 Jun 2027June
Week 25Mon, 21 Jun 2027Sun, 27 Jun 2027June
Week 26Mon, 28 Jun 2027Sun, 4 Jul 2027June
Week 27Mon, 5 Jul 2027Sun, 11 Jul 2027July
Week 28Mon, 12 Jul 2027Sun, 18 Jul 2027July
Week 29Mon, 19 Jul 2027Sun, 25 Jul 2027July
Week 30Mon, 26 Jul 2027Sun, 1 Aug 2027July
Week 31Mon, 2 Aug 2027Sun, 8 Aug 2027August
Week 32Mon, 9 Aug 2027Sun, 15 Aug 2027August
Week 33Mon, 16 Aug 2027Sun, 22 Aug 2027August
Week 34Mon, 23 Aug 2027Sun, 29 Aug 2027August
Week 35Mon, 30 Aug 2027Sun, 5 Sept 2027August
Week 36Mon, 6 Sept 2027Sun, 12 Sept 2027September
Week 37Mon, 13 Sept 2027Sun, 19 Sept 2027September
Week 38Mon, 20 Sept 2027Sun, 26 Sept 2027September
Week 39Mon, 27 Sept 2027Sun, 3 Oct 2027September
Week 40Mon, 4 Oct 2027Sun, 10 Oct 2027October
Week 41Mon, 11 Oct 2027Sun, 17 Oct 2027October
Week 42Mon, 18 Oct 2027Sun, 24 Oct 2027October
Week 43Mon, 25 Oct 2027Sun, 31 Oct 2027October
Week 44Mon, 1 Nov 2027Sun, 7 Nov 2027November
Week 45Mon, 8 Nov 2027Sun, 14 Nov 2027November
Week 46Mon, 15 Nov 2027Sun, 21 Nov 2027November
Week 47Mon, 22 Nov 2027Sun, 28 Nov 2027November
Week 48Mon, 29 Nov 2027Sun, 5 Dec 2027November
Week 49Mon, 6 Dec 2027Sun, 12 Dec 2027December
Week 50Mon, 13 Dec 2027Sun, 19 Dec 2027December
Week 51Mon, 20 Dec 2027Sun, 26 Dec 2027December
Week 52Mon, 27 Dec 2027Sun, 2 Jan 2028December

Week numbers 2026

2026 has 53 weeks. Week 1 started on Monday 29 December 2025 and week 53 runs from Monday 28 December 2026 to Sunday 3 January 2027.

Show all 53 weeks of 2026
WeekMondaySundayMonth
Week 1Mon, 29 Dec 2025Sun, 4 Jan 2026December
Week 2Mon, 5 Jan 2026Sun, 11 Jan 2026January
Week 3Mon, 12 Jan 2026Sun, 18 Jan 2026January
Week 4Mon, 19 Jan 2026Sun, 25 Jan 2026January
Week 5Mon, 26 Jan 2026Sun, 1 Feb 2026January
Week 6Mon, 2 Feb 2026Sun, 8 Feb 2026February
Week 7Mon, 9 Feb 2026Sun, 15 Feb 2026February
Week 8Mon, 16 Feb 2026Sun, 22 Feb 2026February
Week 9Mon, 23 Feb 2026Sun, 1 Mar 2026February
Week 10Mon, 2 Mar 2026Sun, 8 Mar 2026March
Week 11Mon, 9 Mar 2026Sun, 15 Mar 2026March
Week 12Mon, 16 Mar 2026Sun, 22 Mar 2026March
Week 13Mon, 23 Mar 2026Sun, 29 Mar 2026March
Week 14Mon, 30 Mar 2026Sun, 5 Apr 2026March
Week 15Mon, 6 Apr 2026Sun, 12 Apr 2026April
Week 16Mon, 13 Apr 2026Sun, 19 Apr 2026April
Week 17Mon, 20 Apr 2026Sun, 26 Apr 2026April
Week 18Mon, 27 Apr 2026Sun, 3 May 2026April
Week 19Mon, 4 May 2026Sun, 10 May 2026May
Week 20Mon, 11 May 2026Sun, 17 May 2026May
Week 21Mon, 18 May 2026Sun, 24 May 2026May
Week 22Mon, 25 May 2026Sun, 31 May 2026May
Week 23Mon, 1 Jun 2026Sun, 7 Jun 2026June
Week 24Mon, 8 Jun 2026Sun, 14 Jun 2026June
Week 25Mon, 15 Jun 2026Sun, 21 Jun 2026June
Week 26Mon, 22 Jun 2026Sun, 28 Jun 2026June
Week 27Mon, 29 Jun 2026Sun, 5 Jul 2026June
Week 28Mon, 6 Jul 2026Sun, 12 Jul 2026July
Week 29Mon, 13 Jul 2026Sun, 19 Jul 2026July
Week 30Mon, 20 Jul 2026Sun, 26 Jul 2026July
Week 31Mon, 27 Jul 2026Sun, 2 Aug 2026July
Week 32Mon, 3 Aug 2026Sun, 9 Aug 2026August
Week 33Mon, 10 Aug 2026Sun, 16 Aug 2026August
Week 34Mon, 17 Aug 2026Sun, 23 Aug 2026August
Week 35Mon, 24 Aug 2026Sun, 30 Aug 2026August
Week 36Mon, 31 Aug 2026Sun, 6 Sept 2026August
Week 37Mon, 7 Sept 2026Sun, 13 Sept 2026September
Week 38Mon, 14 Sept 2026Sun, 20 Sept 2026September
Week 39Mon, 21 Sept 2026Sun, 27 Sept 2026September
Week 40Mon, 28 Sept 2026Sun, 4 Oct 2026September
Week 41Mon, 5 Oct 2026Sun, 11 Oct 2026October
Week 42Mon, 12 Oct 2026Sun, 18 Oct 2026October
Week 43Mon, 19 Oct 2026Sun, 25 Oct 2026October
Week 44Mon, 26 Oct 2026Sun, 1 Nov 2026October
Week 45Mon, 2 Nov 2026Sun, 8 Nov 2026November
Week 46Mon, 9 Nov 2026Sun, 15 Nov 2026November
Week 47Mon, 16 Nov 2026Sun, 22 Nov 2026November
Week 48Mon, 23 Nov 2026Sun, 29 Nov 2026November
Week 49Mon, 30 Nov 2026Sun, 6 Dec 2026November
Week 50Mon, 7 Dec 2026Sun, 13 Dec 2026December
Week 51Mon, 14 Dec 2026Sun, 20 Dec 2026December
Week 52Mon, 21 Dec 2026Sun, 27 Dec 2026December
Week 53Mon, 28 Dec 2026Sun, 3 Jan 2027December

UK bank holidays by week number

The next bank holidays in England and Wales with their ISO week. Plan time off around them with the working days calculator.

Bank holidayDateWeek
Christmas DayFri, 25 Dec 2026Week 52
Boxing Day (substitute day)Mon, 28 Dec 2026Week 53
New Year's DayFri, 1 Jan 2027Week 53 of 2026
Good FridayFri, 26 Mar 2027Week 12
Easter MondayMon, 29 Mar 2027Week 13
Early May bank holidayMon, 3 May 2027Week 18
Spring bank holidayMon, 31 May 2027Week 22
Summer bank holidayMon, 30 Aug 2027Week 35
Christmas Day (substitute day)Mon, 27 Dec 2027Week 52
Boxing Day (substitute day)Tue, 28 Dec 2027Week 52

HMRC tax weeks 2026/27

Payroll does not use calendar weeks. UK tax week 1 always starts on 6 April, whatever the weekday, and runs for 7 days. A tax year has 52 full weeks plus one or two days in week 53. Tax months run from the 6th to the 5th of the next month.

Show all tax weeks of 2026/27
Tax weekFromTo
Week 1Mon, 6 Apr 2026Sun, 12 Apr 2026
Week 2Mon, 13 Apr 2026Sun, 19 Apr 2026
Week 3Mon, 20 Apr 2026Sun, 26 Apr 2026
Week 4Mon, 27 Apr 2026Sun, 3 May 2026
Week 5Mon, 4 May 2026Sun, 10 May 2026
Week 6Mon, 11 May 2026Sun, 17 May 2026
Week 7Mon, 18 May 2026Sun, 24 May 2026
Week 8Mon, 25 May 2026Sun, 31 May 2026
Week 9Mon, 1 Jun 2026Sun, 7 Jun 2026
Week 10Mon, 8 Jun 2026Sun, 14 Jun 2026
Week 11Mon, 15 Jun 2026Sun, 21 Jun 2026
Week 12Mon, 22 Jun 2026Sun, 28 Jun 2026
Week 13Mon, 29 Jun 2026Sun, 5 Jul 2026
Week 14Mon, 6 Jul 2026Sun, 12 Jul 2026
Week 15Mon, 13 Jul 2026Sun, 19 Jul 2026
Week 16Mon, 20 Jul 2026Sun, 26 Jul 2026
Week 17Mon, 27 Jul 2026Sun, 2 Aug 2026
Week 18Mon, 3 Aug 2026Sun, 9 Aug 2026
Week 19Mon, 10 Aug 2026Sun, 16 Aug 2026
Week 20Mon, 17 Aug 2026Sun, 23 Aug 2026
Week 21Mon, 24 Aug 2026Sun, 30 Aug 2026
Week 22Mon, 31 Aug 2026Sun, 6 Sept 2026
Week 23Mon, 7 Sept 2026Sun, 13 Sept 2026
Week 24Mon, 14 Sept 2026Sun, 20 Sept 2026
Week 25Mon, 21 Sept 2026Sun, 27 Sept 2026
Week 26Mon, 28 Sept 2026Sun, 4 Oct 2026
Week 27Mon, 5 Oct 2026Sun, 11 Oct 2026
Week 28Mon, 12 Oct 2026Sun, 18 Oct 2026
Week 29Mon, 19 Oct 2026Sun, 25 Oct 2026
Week 30Mon, 26 Oct 2026Sun, 1 Nov 2026
Week 31Mon, 2 Nov 2026Sun, 8 Nov 2026
Week 32Mon, 9 Nov 2026Sun, 15 Nov 2026
Week 33Mon, 16 Nov 2026Sun, 22 Nov 2026
Week 34Mon, 23 Nov 2026Sun, 29 Nov 2026
Week 35Mon, 30 Nov 2026Sun, 6 Dec 2026
Week 36Mon, 7 Dec 2026Sun, 13 Dec 2026
Week 37Mon, 14 Dec 2026Sun, 20 Dec 2026
Week 38Mon, 21 Dec 2026Sun, 27 Dec 2026
Week 39Mon, 28 Dec 2026Sun, 3 Jan 2027
Week 40Mon, 4 Jan 2027Sun, 10 Jan 2027
Week 41Mon, 11 Jan 2027Sun, 17 Jan 2027
Week 42Mon, 18 Jan 2027Sun, 24 Jan 2027
Week 43Mon, 25 Jan 2027Sun, 31 Jan 2027
Week 44Mon, 1 Feb 2027Sun, 7 Feb 2027
Week 45Mon, 8 Feb 2027Sun, 14 Feb 2027
Week 46Mon, 15 Feb 2027Sun, 21 Feb 2027
Week 47Mon, 22 Feb 2027Sun, 28 Feb 2027
Week 48Mon, 1 Mar 2027Sun, 7 Mar 2027
Week 49Mon, 8 Mar 2027Sun, 14 Mar 2027
Week 50Mon, 15 Mar 2027Sun, 21 Mar 2027
Week 51Mon, 22 Mar 2027Sun, 28 Mar 2027
Week 52Mon, 29 Mar 2027Sun, 4 Apr 2027
Week 53Mon, 5 Apr 2027Mon, 5 Apr 2027

How many weeks are in a year?

YearWeeksWeek 1 starts
202552Mon 30 Dec 2024
202653Mon 29 Dec 2025
202752Mon 4 Jan 2027
202852Mon 3 Jan 2028

Planning time off or a deadline? The working days calculator skips weekends and bank holidays, the days between dates calculator counts any span, and the holiday entitlement calculator shows how much leave you get. When the clocks change, see when the clocks go back.

FAQ

What week number is it today?
The current week is shown at the top of this page, with the Monday and Sunday of the week. It is worked out from your device's date when the page opens, so it is always up to date.
How are week numbers counted?
Most of Europe, including the UK for business use, follows ISO 8601: weeks run Monday to Sunday and week 1 is the week with the first Thursday of the year, so it always contains 4 January. That is why the first days of January can still belong to the last week of the previous year.
When does week 1 of 2027 start?
On Monday 4 January 2027. Friday 1 to Sunday 3 January 2027 still belong to week 53 of 2026. 2027 has 52 weeks, and the last one ends on Sunday 2 January 2028.
Does 2026 have 53 weeks?
Yes. 2026 starts on a Thursday, so it has 53 ISO weeks. Week 53 of 2026 runs from Monday 28 December 2026 to Sunday 3 January 2027. A 53-week year happens when 1 January is a Thursday, or a Wednesday in a leap year. The next one is 2032.
What week number is Christmas 2026?
Christmas Day, Friday 25 December 2026, is in week 52. The Boxing Day substitute bank holiday on Monday 28 December and New Year’s Day, Friday 1 January 2027, are both in week 53 of 2026. Week 1 of 2027 starts on Monday 4 January.
What tax week is it?
UK tax weeks are not the same as calendar week numbers. HMRC tax week 1 always starts on 6 April, whatever the weekday, and each tax week is 7 days from there. In the 2026/27 tax year, week 1 is Monday 6 to Sunday 12 April 2026 and week 52 ends on Sunday 4 April 2027. The table above lists every tax week.
Will I get 53 weekly paydays in 2026/27?
If you are paid weekly on a Monday, yes. The 2026/27 tax year runs from Monday 6 April 2026 to Monday 5 April 2027, so it holds 53 Mondays and the last payday falls in tax week 53. HMRC has that payment taxed on a non-cumulative week 1 basis, so the tax on it can look different from your other payslips. Paid on another weekday, you get the usual 52.
Are US week numbers different?
Often, yes. In the US the week usually starts on Sunday and week 1 is the week containing 1 January, so US calendars and Outlook with US settings can be one week off from ISO numbers. When planning with partners abroad, give the date as well as the week.
How do I get the week number in Excel or Google Sheets?
Use =ISOWEEKNUM(A1) with a date in A1. It returns the ISO week used on this page. The older =WEEKNUM(A1) counts the US way by default; =WEEKNUM(A1,21) gives the ISO week as well.

Legal basis and sources

For information only. Your contract or specific circumstances may change the result.

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