Week numbers 2026: ISO weeks with dates
2026 has 53 ISO weeks. Week 1 runs from Dec 29, 2025 to Jan 4, and week 53 ends on Jan 3, 2027. Weeks start on Monday.
All ISO weeks of 2026
| Week | Monday | Sunday |
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| 1 | Dec 29, 2025 | Jan 4, 2026 |
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| 2 | Jan 5, 2026 | Jan 11, 2026 |
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| 3 | Jan 12, 2026 | Jan 18, 2026 |
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| 4 | Jan 19, 2026 | Jan 25, 2026 |
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| 5 | Jan 26, 2026 | Feb 1, 2026 |
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| 6 | Feb 2, 2026 | Feb 8, 2026 |
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| 7 | Feb 9, 2026 | Feb 15, 2026 |
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| 8 | Feb 16, 2026 | Feb 22, 2026 |
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| 9 | Feb 23, 2026 | Mar 1, 2026 |
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| 10 | Mar 2, 2026 | Mar 8, 2026 |
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| 11 | Mar 9, 2026 | Mar 15, 2026 |
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| 12 | Mar 16, 2026 | Mar 22, 2026 |
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| 13 | Mar 23, 2026 | Mar 29, 2026 |
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| 14 | Mar 30, 2026 | Apr 5, 2026 |
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| 15 | Apr 6, 2026 | Apr 12, 2026 |
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| 16 | Apr 13, 2026 | Apr 19, 2026 |
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| 17 | Apr 20, 2026 | Apr 26, 2026 |
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| 18 | Apr 27, 2026 | May 3, 2026 |
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| 19 | May 4, 2026 | May 10, 2026 |
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| 20 | May 11, 2026 | May 17, 2026 |
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| 21 | May 18, 2026 | May 24, 2026 |
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| 22 | May 25, 2026 | May 31, 2026 |
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| 23 | Jun 1, 2026 | Jun 7, 2026 |
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| 24 | Jun 8, 2026 | Jun 14, 2026 |
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| 25 | Jun 15, 2026 | Jun 21, 2026 |
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| 26 | Jun 22, 2026 | Jun 28, 2026 |
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| 27 | Jun 29, 2026 | Jul 5, 2026 |
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| 28 | Jul 6, 2026 | Jul 12, 2026 |
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| 29 | Jul 13, 2026 | Jul 19, 2026 |
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| 30 | Jul 20, 2026 | Jul 26, 2026 |
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| 31 | Jul 27, 2026 | Aug 2, 2026 |
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| 32 | Aug 3, 2026 | Aug 9, 2026 |
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| 33 | Aug 10, 2026 | Aug 16, 2026 |
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| 34 | Aug 17, 2026 | Aug 23, 2026 |
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| 35 | Aug 24, 2026 | Aug 30, 2026 |
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| 36 | Aug 31, 2026 | Sep 6, 2026 |
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| 37 | Sep 7, 2026 | Sep 13, 2026 |
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| 38 | Sep 14, 2026 | Sep 20, 2026 |
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| 39 | Sep 21, 2026 | Sep 27, 2026 |
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| 40 | Sep 28, 2026 | Oct 4, 2026 |
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| 41 | Oct 5, 2026 | Oct 11, 2026 |
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| 42 | Oct 12, 2026 | Oct 18, 2026 |
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| 43 | Oct 19, 2026 | Oct 25, 2026 |
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| 44 | Oct 26, 2026 | Nov 1, 2026 |
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| 45 | Nov 2, 2026 | Nov 8, 2026 |
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| 46 | Nov 9, 2026 | Nov 15, 2026 |
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| 47 | Nov 16, 2026 | Nov 22, 2026 |
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| 48 | Nov 23, 2026 | Nov 29, 2026 |
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| 49 | Nov 30, 2026 | Dec 6, 2026 |
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| 50 | Dec 7, 2026 | Dec 13, 2026 |
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| 51 | Dec 14, 2026 | Dec 20, 2026 |
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| 52 | Dec 21, 2026 | Dec 27, 2026 |
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| 53 | Dec 28, 2026 | Jan 3, 2027 |
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Calendar with week numbers
Mondays show the ISO week number under the date.
January | Mo | Tu | We | Th | Fr | Sa | Su |
|---|
| | | 1 | 2 | 3 | 4 |
| 5W2 | 6 | 7 | 8 | 9 | 10 | 11 |
| 12W3 | 13 | 14 | 15 | 16 | 17 | 18 |
| 19W4 | 20 | 21 | 22 | 23 | 24 | 25 |
| 26W5 | 27 | 28 | 29 | 30 | 31 | |
February | Mo | Tu | We | Th | Fr | Sa | Su |
|---|
| | | | | | 1 |
| 2W6 | 3 | 4 | 5 | 6 | 7 | 8 |
| 9W7 | 10 | 11 | 12 | 13 | 14 | 15 |
| 16W8 | 17 | 18 | 19 | 20 | 21 | 22 |
| 23W9 | 24 | 25 | 26 | 27 | 28 | |
March | Mo | Tu | We | Th | Fr | Sa | Su |
|---|
| | | | | | 1 |
| 2W10 | 3 | 4 | 5 | 6 | 7 | 8 |
| 9W11 | 10 | 11 | 12 | 13 | 14 | 15 |
| 16W12 | 17 | 18 | 19 | 20 | 21 | 22 |
| 23W13 | 24 | 25 | 26 | 27 | 28 | 29 |
| 30W14 | 31 | | | | | |
April | Mo | Tu | We | Th | Fr | Sa | Su |
|---|
| | 1 | 2 | 3 | 4 | 5 |
| 6W15 | 7 | 8 | 9 | 10 | 11 | 12 |
| 13W16 | 14 | 15 | 16 | 17 | 18 | 19 |
| 20W17 | 21 | 22 | 23 | 24 | 25 | 26 |
| 27W18 | 28 | 29 | 30 | | | |
May | Mo | Tu | We | Th | Fr | Sa | Su |
|---|
| | | | 1 | 2 | 3 |
| 4W19 | 5 | 6 | 7 | 8 | 9 | 10 |
| 11W20 | 12 | 13 | 14 | 15 | 16 | 17 |
| 18W21 | 19 | 20 | 21 | 22 | 23 | 24 |
| 25W22 | 26 | 27 | 28 | 29 | 30 | 31 |
June | Mo | Tu | We | Th | Fr | Sa | Su |
|---|
| 1W23 | 2 | 3 | 4 | 5 | 6 | 7 |
| 8W24 | 9 | 10 | 11 | 12 | 13 | 14 |
| 15W25 | 16 | 17 | 18 | 19 | 20 | 21 |
| 22W26 | 23 | 24 | 25 | 26 | 27 | 28 |
| 29W27 | 30 | | | | | |
July | Mo | Tu | We | Th | Fr | Sa | Su |
|---|
| | 1 | 2 | 3 | 4 | 5 |
| 6W28 | 7 | 8 | 9 | 10 | 11 | 12 |
| 13W29 | 14 | 15 | 16 | 17 | 18 | 19 |
| 20W30 | 21 | 22 | 23 | 24 | 25 | 26 |
| 27W31 | 28 | 29 | 30 | 31 | | |
August | Mo | Tu | We | Th | Fr | Sa | Su |
|---|
| | | | | 1 | 2 |
| 3W32 | 4 | 5 | 6 | 7 | 8 | 9 |
| 10W33 | 11 | 12 | 13 | 14 | 15 | 16 |
| 17W34 | 18 | 19 | 20 | 21 | 22 | 23 |
| 24W35 | 25 | 26 | 27 | 28 | 29 | 30 |
| 31W36 | | | | | | |
September | Mo | Tu | We | Th | Fr | Sa | Su |
|---|
| 1 | 2 | 3 | 4 | 5 | 6 |
| 7W37 | 8 | 9 | 10 | 11 | 12 | 13 |
| 14W38 | 15 | 16 | 17 | 18 | 19 | 20 |
| 21W39 | 22 | 23 | 24 | 25 | 26 | 27 |
| 28W40 | 29 | 30 | | | | |
October | Mo | Tu | We | Th | Fr | Sa | Su |
|---|
| | | 1 | 2 | 3 | 4 |
| 5W41 | 6 | 7 | 8 | 9 | 10 | 11 |
| 12W42 | 13 | 14 | 15 | 16 | 17 | 18 |
| 19W43 | 20 | 21 | 22 | 23 | 24 | 25 |
| 26W44 | 27 | 28 | 29 | 30 | 31 | |
November | Mo | Tu | We | Th | Fr | Sa | Su |
|---|
| | | | | | 1 |
| 2W45 | 3 | 4 | 5 | 6 | 7 | 8 |
| 9W46 | 10 | 11 | 12 | 13 | 14 | 15 |
| 16W47 | 17 | 18 | 19 | 20 | 21 | 22 |
| 23W48 | 24 | 25 | 26 | 27 | 28 | 29 |
| 30W49 | | | | | | |
December | Mo | Tu | We | Th | Fr | Sa | Su |
|---|
| 1 | 2 | 3 | 4 | 5 | 6 |
| 7W50 | 8 | 9 | 10 | 11 | 12 | 13 |
| 14W51 | 15 | 16 | 17 | 18 | 19 | 20 |
| 21W52 | 22 | 23 | 24 | 25 | 26 | 27 |
| 28W53 | 29 | 30 | 31 | | | |