Calendar weeks 2025
1 30.12–05.01.25 2 06.01–12.01.25 3 13.01–19.01.25 4 20.01–26.01.25 5 27.01–02.02.25 6 03.02–09.02.25 7 10.02–16.02.25 8 17.02–23.02.25 9 24.02–02.03.25 10 03.03–09.03.25 11 10.03–16.03.25 12 17.03–23.03.25 13 24.03–30.03.25 14 31.03–06.04.25 15 07.04–13.04.25 16 14.04–20.04.25 17 21.04–27.04.25 18 28.04–04.05.25 19 05.05–11.05.25 20 12.05–18.05.25 21 19.05–25.05.25 22 26.05–01.06.25 23 02.06–08.06.25 24 09.06–15.06.25 25 16.06–22.06.25 26 23.06–29.06.25 27 30.06–06.07.25 28 07.07–13.07.25 29 14.07–20.07.25 30 21.07–27.07.25 31 28.07–03.08.25 32 04.08–10.08.25 33 11.08–17.08.25 34 18.08–24.08.25 35 25.08–31.08.25 36 01.09–07.09.25 37 08.09–14.09.25 38 15.09–21.09.25 39 22.09–28.09.25 40 29.09–05.10.25 41 06.10–12.10.25 42 13.10–19.10.25 43 20.10–26.10.25 44 27.10–02.11.25 45 03.11–09.11.25 46 10.11–16.11.25 47 17.11–23.11.25 48 24.11–30.11.25 49 01.12–07.12.25 50 08.12–14.12.25 51 15.12–21.12.25 52 22.12–28.12.25 1 29.12–04.01.26
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Mathematisch präzise
Genaue Berechnungen nach DIN 1355
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ISO 8601 Standard
Weltweit konsistente Wochennummern
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Topaktuell
Tägliche Aktualisierungen
Kalenderwoche für ein Datum finden
Calendar weeks 2025 in detail
Here you get a complete overview of all calendar weeks in 2025. The year has 52 calendar weeks, starting with CW 1 on 30.12.2024 and ending with CW 52 on 28.12.2025.
Calendar weeks are essential for precise planning in business, logistics, and private life. They follow ISO 8601, where week 1 is the week containing the first Thursday of the year.
Why are calendar weeks important?
- Standardization: Consistent time references worldwide.
- Project management: Clear timelines for projects and deadlines.
- Production planning: Better optimization of operations and supply chains.
- Vacation planning: Simple coordination of vacation periods.
Use our interactive overview to quickly find a specific calendar week or map a date to its week number.
Feiertage 2025 entdecken
Wählen Sie ein Land und eine Region aus, um die gesetzlichen Feiertage für das Jahr 2025 anzuzeigen.
| Data | Dzień tygodnia | Nazwa święta | TK |
|---|---|---|---|
| 01.01.2025 | Mittwoch | Neujahrstag | 1 |
| 06.01.2025 | Montag | Heilige Drei Könige | 2 |
| 18.04.2025 | Freitag | Karfreitag | 16 |
| 21.04.2025 | Montag | Ostermontag | 17 |
| 01.05.2025 | Donnerstag | Tag der Arbeit | 18 |
| 29.05.2025 | Donnerstag | Christi Himmelfahrt | 22 |
| 09.06.2025 | Montag | Pfingstmontag | 24 |
| 19.06.2025 | Donnerstag | Fronleichnam | 25 |
| 03.10.2025 | Freitag | Tag der Deutschen Einheit | 40 |
| 01.11.2025 | Samstag | Allerheiligen | 44 |
| 25.12.2025 | Donnerstag | 1. Weihnachtsfeiertag | 52 |
| 26.12.2025 | Freitag | 2. Weihnachtsfeiertag | 52 |
Frequently Asked Questions
Pytania szczegółowe
What calendar week is it today?
Today is calendar week 42 of 2026, running from 12.10.2026 to 18.10.2026.
How many calendar weeks does 2025 have?
2025 has 52 calendar weeks. The first week starts on 30.12.2024 and the last week ends on 28.12.2025.
General Questions
What is a calendar week?
A calendar week (CW) is a continuous numbering of the weeks of a year. It is often used in planning and organization.
How is the calendar week calculated?
The calendar week is calculated according to the ISO 8601 standard. The first calendar week of a year is the one that contains the first Thursday of the year.
Why is the calendar week important?
The calendar week is important for planning appointments, projects, and events, as it provides a uniform and internationally understandable time indication.
How many calendar weeks does a year have?
A year usually has 52 calendar weeks, but sometimes 53, depending on how the days are distributed over the weeks.
How can I calculate the calendar week for a specific date?
You can calculate the calendar week for a specific date using various online tools or calendar applications. This page shows you the current calendar week.
What is the difference between a calendar week and a normal week?
A calendar week is a standardized method for numbering weeks within a year, while a normal week is simply a period of seven days.
How do I find the calendar week for next year?
You can calculate the calendar week for next year by determining the date of the first Thursday of the next year and counting the weeks from that date.
Is there an easy way to determine the current calendar week?
Yes, this page provides you with an easy and quick way to determine the current calendar week without having to calculate it yourself.
Technical Questions
How accurate is the calculation of the calendar week on this page?
The calculation of the calendar week on this page is done according to the ISO 8601 standard and is therefore very accurate.
Can I display the calendar week for past or future dates?
This page shows the current calendar week. For past or future dates, you can use other calendar applications or online tools.
What algorithms are used to calculate the calendar week?
The calendar week is calculated according to the ISO 8601 algorithm, which ensures that the first calendar week of a year contains the first Thursday of the year.
How are leap years taken into account when calculating the calendar week?
Leap years are automatically taken into account when calculating the calendar week, as the calculation is based on the date of the first Thursday of the year.
Last updated: 17/10/2026
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