How do I count the number of weeks between two dates?

Subtract the earlier date from the later one to get total days, then divide by 7. The whole-number part is full weeks and the remainder is leftover days. This tool does all three for you automatically.

What if I enter the end date before the start date?

It still works. The tool uses the absolute difference, so swapping the two dates gives the same positive number of weeks.

How accurate is the week count?

It is exact to the day. Both dates are floored to local midnight before subtracting, so there is no hour-of-day rounding. Full weeks are whole sevens of days, and the decimal figure is total days divided by seven.

Are both the start and end dates included?

The result is the gap between the two dates, so it counts the nights between them rather than the calendar days touched. From Monday to the following Monday is exactly 1 week (7 days), not 8.

How many weeks is a typical pregnancy?

A full-term pregnancy is about 40 weeks (280 days) counted from the first day of the last menstrual period. Entering that date as the start gives a live week-and-day figure you can compare against milestones.

Does this account for leap years?

Yes. The calculation works on the actual calendar dates, so any 29 February that falls inside the range is included automatically in the total day count.

Weeks Between Two Dates

Q: Are my dates sent anywhere?

No. The calculator is privacy-first — both dates stay in your browser and are never uploaded to a server.

Weeks between two dates

This tool counts how many weeks separate any two dates, reporting the span three ways: as full weeks plus leftover days, as an exact decimal-week figure, and as a total day count. It is handy for pregnancy tracking, project timelines, notice periods, leave calculations, and counting down to a deadline.

How it works

Both dates are floored to local midnight, so the result never wobbles with the time of day. The tool then takes the absolute difference in days and divides by 7:

total days ÷ 7 = decimal weeks

The whole-number part is the count of full weeks, and the remainder is the leftover days. Because it uses the absolute difference, the order you enter the dates in does not matter — the answer is always positive.

Example

From 1 January 2026 to 15 February 2026 is 45 days. Dividing by 7 gives 6 weeks and 3 days (6 × 7 = 42, with 3 days left over), or 6.43 weeks as a decimal.

It is privacy-first: both dates stay in your browser and are never sent anywhere.