🗓️ Weeks Between Dates Calculator
Find the exact number of full weeks — plus any leftover days — between any two dates.
Enter Two Dates
Result
How the Weeks Between Dates Calculator Works
This calculator finds the exact number of calendar days between two dates, then divides that span into full 7-day weeks plus any remaining days — along with a precise decimal-weeks figure for planning purposes.
Formula
Full Weeks = floor(Total Days ÷ 7)
Leftover Days = Total Days mod 7
Worked example: From January 1, 2026 to June 30, 2026 is 180 days — that's 25 full weeks and 5 leftover days (25.71 weeks as a decimal).
Frequently Asked Questions
How many weeks pregnant am I?
This general-purpose weeks calculator works for pregnancy dating too — enter your last menstrual period as the first date and today as the second date. For dedicated pregnancy milestones, see our Pregnancy Calculator.
What's the difference between full weeks and decimal weeks?
Full weeks counts only complete 7-day periods and shows the leftover days separately (e.g. "25 weeks, 5 days"). Decimal weeks expresses the same span as a single number with a fraction (e.g. "25.71 weeks") for easier comparison or averaging.
Does the order of the two dates matter?
No, enter the dates in either order — the calculator automatically computes the span between them regardless of which is earlier.