About the Weeks Between Dates Calculator
Weeks between two dates, in whole weeks plus days and as a decimal.
Also known as: week difference calculator, how many weeks between, weeks until date.
How to use this calculator
- Enter from, to.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
weeks = days ÷ 7
Worked example
Using the values pre-filled in the calculator above:
- From: 2026-09-22
- To: 2026-12-21
the calculator returns:
- Weeks: 12.8571
- Whole weeks and days: 12 weeks, 6 days
- Complete weeks: 12
- Total days: 90