What if I was born on 29 February?

In years that aren't leap years, your birthday is shown as 28 February. Your age still increases by exactly one year on that date.

How accurate is the Chinese zodiac shown here?

It uses your Gregorian birth year, which is correct for most of the year but can be a year off for people born in January or February before the Lunar New Year — a known simplification.

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Age Calculator

Calculate exact age in years, months and days from a date of birth.

Last updated 27 July 2026

Enter a date of birth.

Enter valid inputs above to see your result.

How this works

What it means

Your exact age broken down into years, months and days, plus useful derived facts like your next birthday and zodiac signs.

How it’s calculated

The calculator takes the calendar difference between your date of birth and the date you're calculating on, counting whole years first, then whole months, then remaining days — the same way you'd count age by hand on a calendar.

Formula

years  = target.year  − dob.year
months = target.month − dob.month
days   = target.day   − dob.day

if days < 0:  months -= 1, days += (days in the month before target)
if months < 0: years -= 1, months += 12

Assumptions

All dates are treated as calendar dates only (no time-of-day or timezone is involved).
A birthday on 29 February is treated as falling on 28 February in non-leap years.
Chinese zodiac is the animal sign based on the Gregorian calendar year, not the precise lunar new year date.

Example calculations

Born 15 August 1990, calculated on 27 July 2026

35 years, 11 months, 12 days — next birthday in 19 days

Born 29 February 2000 (a leap day), calculated on 1 March 2025

25 years, 0 months, 0 days — next birthday shown as 28 February 2026, since 2025 isn't a leap year

Born 1 January 2020, calculated on 1 January 2026

6 years, 0 months, 0 days — exactly 2,192 days old, birthday is today

Frequently asked questions

"Total Months" counts every whole month you've been alive, including the partial year since your last birthday — so it's rarely an exact multiple of 12.