How to Calculate Weeks Between Dates
Choose two dates and calculate the interval. The result expresses it as completed seven-day weeks plus remaining days.
Whole Weeks vs. Decimal Weeks
Whole weeks are useful for calendar-style intervals, while decimal weeks show the same duration as total days divided by seven. These formats answer slightly different planning questions.
Inclusive Counting
Enable inclusive counting when both the start and end dates should be part of the interval. Otherwise the tool measures elapsed calendar days.
Frequently Asked Questions
How many days are in a week?
A week contains seven calendar days.
Why is the decimal week value different from whole weeks?
Decimal weeks include the fractional value of remaining days, while whole weeks count only complete seven-day periods.