Date calculators · Ages & date spans
Weeks Between Dates
See how many full weeks fit between two dates—and the days left over.
Your calculation
Ready when you are
Choose your dates.
Select your counting rules and calculate.
Calculation details
| Step | Value |
|---|
How to use this calculator
Set the start and end dates. Choose whether to include the end date, then calculate whole seven-day weeks, remaining days and a decimal-week total rounded to four places.
A week here means seven calendar dates. It is not an ISO week number or a count of Monday boundaries. Weekends and holidays stay in the total. A reversed range is shown as backward; the sign applies to the whole span. Dates are measured without time-of-day or daylight-saving effects.
A worked example
November 1 to December 1, 2026 spans 30 days: four weeks and two days. Counting both dates gives 31 days, or four weeks and three days.
Should I use this for week numbers?
Use the ISO Week Number Calculator to identify a calendar week or convert a week-year and week number to dates. This calculator answers how long a span is in seven-day units.
Which calendar and years are supported?
These tools use Gregorian calendar dates for years 1–9999, without historical calendar-switch dates. They count dates, not elapsed hours. Today buttons use the current date in your browser's time zone.
What happens to my dates?
Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.