Your age, to the second
How the count works
One reading is the exact millisecond gap between now and midnight on your birth date. Leap years aren't corrected for — the calendar already contains them, so counting real elapsed days is enough to be exact rather than approximate.
The seconds and minutes figures re-read every tick. Everything else is fixed at the moment you press Read.
Why days and seconds, not just years
Years are the unit for legal thresholds — voting, retirement, insurance bands. Days are the unit of actual experience: you wake, you sleep, one passes. Seeing the running total as a single figure — 12,000 days, 15,000 days — lands differently than a birthday number you already knew.
By 30 you have passed roughly 946 million seconds. That is a scale we normally attach to national budgets and planetary distances, not to one life. Watching the last digits move is the point of the live readout.
Milestones that don't fall on birthdays
Some milestones are only visible once you measure in days or seconds. 10,000 days old arrives at about 27 years and 4 months. One billion seconds lands at roughly 31 years and 8 months. The age milestones guide lists the full set and the age each one falls at.
Common questions
Enter your date of birth above and press Read. You will see your exact age in years, months, weeks, days, hours, minutes and seconds — the last two updating live every second.
The reading shows your exact number of days alive, counting every real day including each February 29th in your lifetime. Enter your birthdate and press Read.
A birthday countdown appears below your results with the exact number of days remaining until your next birthday.
The reading shows your total age in months as well as years. Someone 25 years and 6 months old reads as 306 months.
Enter their date of birth instead of yours and press Read. The tool works for any date in the past.
Weeks are your total days alive divided by 7. Enter your birthdate above for the exact figure.
Subtract your birth year from the target year. Born in 1990, your age in 2030 is 40 — or 39 if your birthday hasn't passed yet that year.
Yes. It counts real elapsed days using the calendar itself, so every February 29th in your lifetime is already included.
Yes. After you press Read, the seconds figure is shown and updates once per second in real time.
Keep reading
How many days old are you, exactly? Why does a year feel faster every time? Browse the guides →