🎂 Free DateKeeper Tool

Age Calculator

Calculate age from a date of birth, see the exact age in years, months, and days, and find the next birthday.

Years, months & daysAny past or future dateNext birthday included

Calculate an age

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

Do more than calculate the age

Get reminded early

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

Share with family

Keep birthdays in a shared family list while everyone chooses their own reminder settings.

Prepare together

Coordinate a call, message, celebration, or group birthday video before the day arrives.

Age Calculator or Birthday Countdown?

Age Calculator

Use this when you want to know how old someone is today, was on a past date, or will be on a future date.

Birthday Countdown

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

Birthday Countdown

More from DateKeeper

💞Anniversary CalculatorCalculate years since a wedding or anniversary.🎬Group Birthday VideoCollect video messages together.🔔Birthday RemindersGet reminded before it arrives.

How the Age Calculator works

1
Enter the date of birth

Choose the person's birthday.

2
Choose the age date

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

3
See the exact age

Get the age in years, months, and days, plus the next birthday.

Questions, answered

What is an age calculator?
An age calculator calculates age from a date of birth and shows the result in years, months, and days.
How do I calculate age from date of birth?
Enter the date of birth, choose the date you want to calculate age on, and DateKeeper will show the exact age.
What does "Age on this date" mean?
It is the date you want to calculate the age for. You can use today, a past date, or a future date.
Can I calculate age on a future date?
Yes. Choose a future date to see how old someone will be on that date.
Can I calculate age on a past date?
Yes. Choose a past date to see how old someone was on that date.
Does the calculator show the next birthday?
Yes. DateKeeper shows the next birthday and how many days are left until it.
What happens for February 29 birthdays?
For leap-day birthdays, DateKeeper shows the next calendar birthday based on the selected year and lets you choose how to handle non-leap years.
Can DateKeeper remind me before the birthday?
Yes. After calculating the age, you can set birthday reminders so DateKeeper reminds you before the next birthday.

Know the age. Remember the birthday.

Calculate the age today, then let DateKeeper remind you before the next birthday arrives.

Create Birthday Countdown