Use this anniversary calculator to measure the exact time since a wedding, relationship, work, company, or custom anniversary. Enter the start date and calculate-on date to see completed years, months, days, total days, next anniversary, days left, weekday, and milestone dates.
Enter an anniversary start date and calculate-on date to see elapsed time, next anniversary, and milestones.
Privacy note: calculator inputs stay in your browser and are not sent to an Age Finder server.
An anniversary calculator measures the time between an important start date and a selected calculation date. It can be used for a wedding anniversary, relationship anniversary, work anniversary, company anniversary, first meeting, launch date, or any personal milestone. The tool shows the exact elapsed time in years, months, and days, plus total days, completed months, next anniversary date, days left, weekday, and milestone anniversaries. It uses calendar-aware date math, so different month lengths and leap-year dates are handled more carefully than a rough day-count estimate.
If a wedding started on January 1, 2020 and the result is calculated on January 1, 2026, the calculator shows the 6th anniversary is today.
For future planning, use the calculate-on date as today or the date when you want to check the anniversary.
BirthdayBirthday Countdown Guide, How Many Days Until My Birthday?How birthday countdowns help with reminders, greetings, and planning.
Age CalculatorsAge Calculator Guide, How to calculate age from date of birthLearn how an age calculator uses your date of birth to calculate your age in years, months, days, total days, and birthday details.
Life StatsAge Milestones Explained, Important Birthday Milestones by AgeIdeas for 1,000-day, 10,000-day, and billion-second milestones.
Enter the original anniversary start date, choose the date you want to calculate on, select the anniversary type, and click Calculate anniversary.
The completed years value shows how many full anniversary years have passed. The exact elapsed time also includes remaining months and days.
Yes. Select Wedding anniversary, enter the wedding date, and choose the calculate-on date to see years married, next anniversary, and milestone dates.
Yes. Use the relationship start date, first date, proposal date, or another meaningful date and select Relationship anniversary.
Yes. Select Work anniversary and enter the start date to calculate completed years, total days, next anniversary, and milestone years.
The next anniversary date is the next yearly repeat of the start date on or after the calculate-on date. Leap-day dates are adjusted safely in non-leap years.
The days-to-next-anniversary result shows the number of calendar days from the calculate-on date to the next anniversary date.
Yes. It shows common milestone years such as 1, 5, 10, 25, 50, and 75 years with dates and status.
Yes. Change the calculate-on date to check how old the anniversary was on a past date or how old it will be on a future date.
Yes. After calculating, you can save the result as PDF, Word, or TXT, or share the result text when your browser supports sharing.