Free Online Week Calculator
Calculate weeks between dates, add weeks to dates, or subtract weeks from dates with our free online week calculator. Supports both calendar weeks and business weeks (Monday-Friday) with multiple date formats.
How to Use the Week Calculator
- 1
Choose Your Settings
Select your preferred date format and choose whether to count calendar weeks or business weeks only.
- 2
Enter Your Dates
Input the start date, end date, or number of weeks depending on what you want to calculate.
- 3
Select Calculation Type
Choose to calculate weeks between dates, add weeks to a start date, or subtract weeks from an end date.
- 4
Get Your Results
View the calculated results with detailed breakdown showing full weeks and remaining days.
Key Features
Calculate Weeks Between Dates
Easily calculate the number of weeks between any two dates with precise results showing full weeks and remaining days
Business Week Support
Option to calculate business weeks only (Monday-Friday), excluding weekends for accurate work planning
Add or Subtract Weeks
Add weeks to a start date to find the end date, or subtract weeks from an end date to find the start date
Multiple Date Formats
Support for different date formats including YYYY-MM-DD, MM/DD/YYYY, and DD/MM/YYYY for international use
What is a Week Calculator?
A week calculator is a useful tool that helps you calculate the number of weeks between two dates, add weeks to a specific date, or subtract weeks from a date. It's particularly useful for project planning, scheduling, and calculating time periods for business or personal purposes. Our calculator supports both standard calendar weeks (7 days) and business weeks (5 working days, Monday-Friday), making it versatile for different needs.
Why Use Our Week Calculator?
- 1
Accurate Calculations
Get precise week calculations with detailed breakdowns showing full weeks and remaining days for complete clarity.
- 2
Business Week Support
Calculate business weeks excluding weekends, perfect for project planning and work scheduling needs.
- 3
Multiple Date Formats
Support for various international date formats (YYYY-MM-DD, MM/DD/YYYY, DD/MM/YYYY) for global accessibility.
- 4
Versatile Calculations
Three calculation modes: find weeks between dates, add weeks to dates, or subtract weeks from dates for all your planning needs.
Frequently Asked Questions
What's the difference between calendar weeks and business weeks?
Calendar weeks count all 7 days of the week, while business weeks only count Monday through Friday (5 working days). When calculating business weeks, weekends are excluded from the count.
How are partial weeks calculated?
The calculator shows both the total weeks as a decimal and breaks it down into full weeks plus remaining days. For example, 2.5 weeks would be displayed as 2 weeks and 3.5 days (or 4 days rounded).
Can I use different date formats?
Yes, the calculator supports three date formats: YYYY-MM-DD (ISO standard), MM/DD/YYYY (US format), and DD/MM/YYYY (European format). You can select your preferred format from the dropdown menu.
How does the business week calculation work?
When business weeks are enabled, the calculator counts only Monday through Friday as working days. It calculates 5 working days as equivalent to 1 business week, automatically skipping weekends in the calculation.
What calculation modes are available?
The calculator offers three modes: 1) Calculate weeks between two dates, 2) Add a specified number of weeks to a start date to find the end date, and 3) Subtract weeks from an end date to find the start date.