How to use the Weeks Between Dates Calculator
Choose a start and an end date. You get the number of full weeks between them and any days left over.
Worked example
From 1 March to 30 April there are 60 days, which is 8 weeks and 4 days. Due dates in pregnancy are counted the same way: 40 weeks, or 280 days, from the first day of the last period. Course and project plans often use week numbers too.
Weeks in a year
A normal year has 52 weeks and 1 day, and a leap year 52 weeks and 2 days. That spare day is why dates move forward a weekday each year. If you need working weeks only, remember to take out public holidays, which change from country to country.
The formula
Elapsed days ÷ 7.
Examples
- 1 Jan to 31 Jan 2026
4 full weeks and 2 days.
- 1 Jan to 1 Jul 2026
25 full weeks and 6 days.
Limitations and assumptions
Counts calendar days, including weekends, and does not count the start day.
Frequently asked questions
How do I count weeks between dates?
Divide the number of days between them by 7.
Are partial weeks shown?
Yes, as extra days.
How do I count only weekdays?
Use the weekday and weekend calculators.
How many weeks are in a year?
52 weeks and 1 or 2 days.