Week Calculator
Calculate the number of weeks between two dates, or add/subtract weeks to a date. Useful for planning and scheduling.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Week Calculator
This calculator handles three operations using dates and weeks. All dates must be in YYYY-MM-DD format (e.g., 2025-01-01).
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Select an operation from the dropdown:
- Difference Between Dates – calculates weeks and days between two dates.
- Add Weeks to Date – adds a number of weeks to a base date.
- Subtract Weeks from Date – subtracts weeks from a base date.
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Enter the required inputs:
- For Difference: provide a Start Date and an End Date.
- For Add/Subtract: provide a Base Date and the Number of Weeks (non-negative, can be decimal like 0.5).
- Click "Calculate" to see the result.
The result shows either the total weeks (and remaining days) or the new date. A formula explanation appears below the result.
Previous Results
| Result | Inputs | Date |
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Frequently Asked Questions
You can choose between calculating the difference between two dates (in weeks and days) or adding/subtracting a specified number of weeks to a base date.
Yes, you can input decimal numbers for weeks (e.g., 1.5 weeks) when adding or subtracting.
The calculator will display an error message prompting you to enter valid dates.