Exact age · next birthday
Age Calculator
Your exact age in years, months and days, the same age expressed every other way, and a live countdown to the next birthday. Everything is worked out on your device.
Exact age
—
Years
—
Months
—
Weeks
—
Days
| Also expressed as | Value |
|---|
Next birthday
Counting Down to the Next One
Next birthday
0
Days
00
Hours
00
Minutes
00
Seconds
Edge cases
Where Age Calculation Gets Awkward
Born on 29 February
Roughly one person in 1,461 has no birthday in three years out of four. The everyday convention used here moves it to 1 March, so the age still increases at the end of February. Legal systems vary: some specify 28 February instead, and the choice can matter for coming of age.
Born on the 31st
Monthly milestones for someone born on the 31st fall on the last day of shorter months. Six months after 31 August is 28 or 29 February, not 3 March. The same clamping rule applies as in the date calculator.
East Asian Age Reckoning
Traditional Korean and some other East Asian systems count a baby as one at birth and add a year at new year rather than on the birthday, making people one or two years older than the international count. South Korea moved to the international system in law in 2023, but the traditional count is still used socially.
Crossing Time Zones
Someone born in Tokyo and now living in London has a birth date recorded in Japanese local time. Strictly the moment is the same everywhere, but the calendar date can differ by one, which occasionally causes paperwork disagreements about a person's stated date of birth.
Answers
Age Calculator Questions
Leap-day birthdays, how age is counted, and what the estimates mean.
How is age actually calculated?
By calendar, not by division. The full years are counted first, then the whole months remaining, then the leftover days. That is what people mean when they say they are thirty-four years and two months old, and it is why the answer is not simply the total days divided by 365.25.
What if I was born on 29 February?
Three out of four years have no 29 February, so a birthday has to be assigned. The common convention, used here, is that the birthday falls on 1 March in non-leap years, since that is the day after 28 February and keeps the age increasing on the right day. Some jurisdictions legally prefer 28 February, and a few countries differ, so treat the result as the everyday answer rather than a legal one.
Why is my age in days not exactly my age in years times 365?
Leap years. Roughly one year in four has 366 days, so a 40-year-old has lived through about ten extra days compared with a plain 365-a-year calculation. The day count here is exact, worked out from the real calendar.
Is the heartbeat figure accurate?
It is an estimate, and a rough one. It assumes a steady average of about 70 beats per minute, which is a reasonable adult resting rate but ignores sleep, exercise, childhood — infants run at well over 100 — and every individual difference. Treat it as a fun order-of-magnitude number, not a medical one.
Can I calculate age at a past or future date?
Yes. Change the second date from today to whatever you need. It works for age at a particular event, age on a future deadline, or the gap between any two dates in either direction.
Does it work for ages under a year?
Yes, and it shows months and days, which is how infant age is normally described. For very young babies the day count and week count are usually the more useful figures.
Is my date of birth sent anywhere?
No. Everything is calculated in the page on your own device. Nothing is transmitted, nothing is stored, and closing the tab discards it.