Weeks Between Dates Calculator

Count the exact number of full weeks, extra days, total days, and hours between any two dates. Use it for project schedules, pregnancy week tracking, school terms, event planning, or any date range where a plain day count is not enough.

Free to useNo signup requiredRuns in your browserLast reviewed October 2026

Start Date (Day)

Start Month

Start Year

End Date (Day)

End Month

End Year

Formula / Logic

Weeks = (End Date - Start Date) / 7. Remaining days after full weeks are displayed separately.

Example

Start Day:1

Start Month:1

Start Year:2026

End Day:1

End Month:3

End Year:2026

Result: Total Weeks: 8, Extra Days: 3, Total Days: 59

How to use this calculator

Enter the start day, month, and year for the first date in the range.
Enter the end day, month, and year for the second date. The order does not matter because the calculator uses the absolute difference.
Select Calculate to get full weeks, leftover days, total days, approximate full months, and total hours.
Use the weeks-and-days result for schedules where “8 weeks and 3 days” is clearer than “59 days”.

Common week conversions

1 week7 days

4 weeks28 days

12 weeks84 days, often used for quarters or school terms

40 weeks280 days, a common pregnancy due-date reference

52 weeks364 days, close to one calendar year

Assumptions and limits

The calculator counts full 24-hour periods between dates and treats the start date as day 0.
Leap years are handled by the browser date engine, so February 29 is included when it falls inside the range.
Month totals are approximate because calendar months vary from 28 to 31 days.
For travel, payroll, legal deadlines, or medical dating, verify whether your use case counts the start date, end date, time zone, or business days differently.

Use Cases

Plan pregnancy and due date tracking
Calculate project sprint durations
Measure time between events in weeks

Frequently Asked Questions

What counts as a full week?

A full week is 7 consecutive days. The calculator divides total days by 7 and shows remaining extra days that are not part of a complete week.

Does the start date count as day 1?

No, the calculation counts full 24-hour periods between the two dates. The start date is considered day 0, and each subsequent day adds 1.

Can I calculate for future dates?

Yes, this calculator works for any date range in the past, present, or future between the year 1900 and 2100.

How many weeks are between two dates?

Enter both dates and the calculator divides the day difference by 7. It shows full weeks plus any extra days, which is usually easier to read than a decimal week value.

Does this calculator handle leap years?

Yes. Date ranges that include February 29 count that extra day automatically, so leap-year spans return the correct total days and weeks.

Related Calculators

Date Difference Calculator Age Calculator Date Add / Subtract Calculator

Weeks Between Dates Calculator

Free to useNo signup requiredRuns in your browserLast reviewed October 2026

How to use this calculator

Enter the start day, month, and year for the first date in the range.

Enter the end day, month, and year for the second date. The order does not matter because the calculator uses the absolute difference.

Select Calculate to get full weeks, leftover days, total days, approximate full months, and total hours.

Use the weeks-and-days result for schedules where “8 weeks and 3 days” is clearer than “59 days”.

Assumptions and limits

The calculator counts full 24-hour periods between dates and treats the start date as day 0.

Leap years are handled by the browser date engine, so February 29 is included when it falls inside the range.

Month totals are approximate because calendar months vary from 28 to 31 days.

For travel, payroll, legal deadlines, or medical dating, verify whether your use case counts the start date, end date, time zone, or business days differently.