Ever wonder how old you are—or how old someone else is—in years, months, and days? That’s what an age calculator (sometimes called a birthday calculator) is for! It’s part calculator, part time machine, and part party trick—perfect for people and pets.
How to Use the Age Calculator (Birthday Calculator)
The birthday calculator lets you find the exact age between two dates. Just enter a date of birth, keep today’s date or choose another date, and click “Calculate Age.”
Whether you’re writing a birthday card or just wondering how many seconds old you are, the age calculator has your back. Keep it handy for all those times you find yourself asking . . .“Wait—how old am I?" or “How old is my mom/sister/best friend/cat?”
How Is Age Calculated?
Your age in years is the number of completed years since you were born. For instance, if you were born on October 20, 2000, you’d still be 25 on October 19, 2026, and you’d turn 26 the very next day.
It might seem like you can simply divide the days you’ve lived by 365 to get a 100% accurate age, but life—and calendars—are rarely that simple. During leap years, February sneaks in an extra day that this shortcut doesn’t take into account.
If you want to calculate age down to the months and days (not just the years), that adds even more complexity because not all months are the same length.
Our age calculator uses the Gregorian calendar to handle all these quirks and provide an accurate age in years, months, and days. It can calculate your age (or someone else’s) on a specific date, going back as far as 1753 and forward as far as 2100.
Frequently Asked Questions
Q: How old is my friend or family member?
A: You can find that out using our birthday calculator. Enter their birth date and select today’s date to find their current age. You can also choose a past or future date to see how old they were or will be on that day.
Q: Can I calculate my age between two dates?
A: Yes. Enter your birth date as the first date and the date you want to calculate your age on as the second. The age calculator will show you your exact age on that day in years, months, and days.
Q: Can I find my age without my exact birth date?
A: You need your birth month, day, and year to calculate your exact age. If you know only your birth year, subtract it from the current year to find the age you turn in the current year.
Q: Can a birthday calculator show my exact age in minutes or seconds?
A: Our birthday calculator gets as close as possible by converting the time between the two dates you enter into minutes and seconds. Because it doesn’t ask for your birth time, those totals reflect the difference between the dates, rather than the exact number of minutes or seconds you’ve been alive.
Q: How old am I if I was born in a leap year?
A: You calculate your age the same way whether you were born in a leap year or any other year. If you were born on February 29, you still grow 1 year older each year, even though your birth date appears on the calendar only in leap years. In other years, you might celebrate on February 28 or March 1.
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