How many weeks since…?
Count the weeks and days since any date, from a birthday to the start of a project.
It has been 14 weeks and 2 days since Sunday, July 26, 2026, or 3 months and 8 days.
How it works
Pick a past date to count the whole weeks since then, with any leftover days. The date you pick is day zero, so the same weekday one week later is exactly 1 week.
Weeks since a date are handy for pregnancy and baby milestones, training plans, sobriety and habit streaks, project sprints, or simply how long ago something happened. Pick a future date and the calculator shows the weeks until it instead. For a countdown, try weeks until a date.
Everything is worked out in your browser, using your own time zone. Nothing you enter is sent anywhere.
Questions people ask
How do I count weeks since a date?
Count the days since the date and divide by seven. The whole number is the weeks, and the remainder is the extra days.
How many weeks is 100 days?
100 days is 14 weeks and 2 days.
How many weeks have passed this year?
Since January 1, 2026, it has been 43 weeks and 5 days.
Does the start date count?
No. The start date is day zero, so a week after a Monday is the next Monday.