Used automatically — no need to change anything.
Your age, every way
The same span of time, counted in different units.
*Rough estimates at ~72 heartbeats and ~16 breaths per minute, and about a third of life spent asleep.
Moments & milestones
Birthday countdown, your signs, and the next big round number.
How this age calculator works
Enter your date of birth and the tool shows your exact age in years, months and days, then keeps a live count of the seconds ticking by. It works entirely in your browser — your birthday never leaves your device.
Time zones, handled for you
Ages depend on where "now" is. The calculator auto-detects your device's time zone and uses it by default, so you don't have to do anything. If you were born in a different time zone and want to be precise to the hour, tick "Born in a different time zone" and pick it. Power users can also display their age as measured in any other zone — useful when a document needs your age at a specific location's local time.
Birth time is optional
Most people only need the date. If you know your time of birth (it's often on your birth certificate), add it for an age that's exact down to the second — otherwise midnight is assumed and the day-level age is still correct.
Two modes
"Age from birthday" is the everyday use. "Between two dates" measures any span — anniversaries, how long until a deadline, a notice period, or the gap between two events — and adds a working-days count that's handy for planning.
Frequently asked questions
How is my age calculated exactly?
We find the largest number of whole months from your birth date that doesn't pass today, then count the leftover days, hours, minutes and seconds. This handles leap years and different month lengths correctly, matching how you'd naturally count your age.
What happens if I was born on 29 February?
In non-leap years your birthday is treated as 28 February, so you still age a full year — the common legal and everyday convention.
Is my date of birth uploaded anywhere?
No. All calculation runs locally in your browser; nothing is sent to a server.
Why does the seconds counter move?
Because your age genuinely increases every moment — the live counter shows time passing in real time down to the microsecond.