With the Calendar Week Calculator, you can use a date to calculate the corresponding calendar week. Conversely, you can use the calendar week to determine the date of the beginning and end of the week you are looking for. You can use the international ISO 8601 calculation method for Europe and Asia and the American calculation method for calendar weeks as the internationally relevant method for calculating calendar weeks.
Important links and information about the calendar week calculator
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Please select the value that you want to calculate. After selecting "Week number", the week number is calculated for the entered date. After selecting the "start and end of a week number" the start and end date for the entered week number are calculated.
Please enter the day, i.e., the day of the month for calculating the week number.
Please enter the month for the week number calculation.
Please enter the year for the week number.
Week number entries / calender week
Please enter the week number for the calculation of week start and week end.
Please enter the year of the week number for the calculation of week start and week end.
Select the method of week number calculation. Available are "International according to ISO", "North American calculation" and the "Arabic calculation", which are described in detail below.
More online calculators
As source for the information in the 'Week Numbers' category, we have used in particular:
Last update on September 22, 2023
The pages of the 'Week Numbers' category were last editorially reviewed by Michael Mühl on September 22, 2023. They all correspond to the current status.
Previous changes on June 25, 2021
- Publication of the Week Number Calculator
- Editorial revision of all texts in this category