💞 Free DateKeeper Tool

Anniversary Calculator

Calculate how long it has been since a wedding, relationship, work anniversary, or other important date.

Years, months & daysNext anniversary includedMilestone year

Calculate an anniversary

Required to calculate the exact anniversary length.
Choose today, a past date, or a future date.
Calculating as of today, July 29, 2026
Free to use · No account needed · Nothing is published publicly

Do more than calculate the years

Get reminded early

Choose reminders at the beginning of the month, the week before, the day before, or whenever works for you.

Share the moment

Share the anniversary result with a partner, family member, or coworker in one tap.

Plan together

Coordinate a card, gift, dinner, trip, or celebration before the anniversary arrives.

How the Anniversary Calculator works

1
Enter the anniversary date

Choose the wedding date, relationship date, work start date, or another important milestone.

2
Choose the calculation date

Use today, a past date, or a future date.

3
See the anniversary result

Get the years, months, and days, plus the next anniversary and days remaining.

Anniversary Calculator or Anniversary Countdown?

Anniversary Calculator

Use this when you want to know how many years, months, and days have passed since an anniversary date.

Coming soon
Anniversary Countdown

Use this when you want to see how many days are left until the next anniversary.

More from DateKeeper

🎂Age CalculatorCalculate age from a date of birth.⏳Birthday CountdownCount down to the next birthday.🎬Group Birthday VideoCollect video messages together.

Questions, answered

What is an anniversary calculator?
An anniversary calculator calculates how long it has been since an anniversary date and shows the result in years, months, and days.
How do I calculate an anniversary?
Enter the anniversary date, choose the date you want to calculate on, and DateKeeper will show the exact anniversary duration.
Can I calculate a wedding anniversary?
Yes. Enter the wedding date to calculate how many years, months, and days you have been married.
Can I calculate how long we've been together?
Yes. Choose relationship anniversary and enter the date your relationship began.
What does "Calculate on this date" mean?
It is the date you want to calculate the anniversary for. You can use today, a past date, or a future date.
Does the calculator show the next anniversary?
Yes. DateKeeper shows the next anniversary date and how many days are left until it.
Can DateKeeper remind me before the anniversary?
Yes. After calculating the anniversary, you can set anniversary reminders so DateKeeper reminds you before the date arrives.

Know the anniversary. Remember it in time.

Calculate the anniversary today, then let DateKeeper remind you before the next one arrives.

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