How your age in hours is worked out
The calculator measures the real time that has passed since you were born, down to the millisecond, and divides it into hours, minutes and seconds. If you add your birth time the count is exact. Without one we assume you were born at midday, which can move the hours by up to 12 either way.
Working it out by hand
Multiply your age in days by 24, then add the hours since the time of day you were born. An ordinary year is 8,760 hours and a leap year is 8,784, so a year averages about 8,766 hours. For minutes multiply the hours by 60, and for seconds multiply again by 60.
Ages in hours
How many hours old you are at the moment of some common birthdays. Where there are two answers, it depends on how many leap days fell in between.
| Birthday | Hours old |
|---|---|
| 1st | 8,760 or 8,784 |
| 5th | 43,824 or 43,848 |
| 10th | 87,648 or 87,672 |
| 18th | 157,776 or 157,800 |
| 21st | 184,080 or 184,104 |
| 30th | 262,968 or 262,992 |
| 40th | 350,640 |
| 50th | 438,288 or 438,312 |
| 60th | 525,960 |
| 70th | 613,608 or 613,632 |
| 80th | 701,280 |
Hour and minute milestones
| Milestone | Age when it arrives |
|---|---|
| 1 million minutes | about 1 year and 11 months |
| 100,000 hours | about 11 years and 5 months |
| 10 million minutes | about 19 years |
| 250,000 hours | about 28 years and 6 months |
| 500,000 hours | about 57 years |
| 750,000 hours | about 85 years and 7 months |
Questions
What about the clocks changing?
The count uses the real time that has passed, not what the clock on the wall says, so the hour lost each spring and gained each autumn cancel out. Your birth time is read as local time where you are now, so if you were born in a different time zone the count can be out by a few hours.
Why does the birth time matter?
For days and years it hardly matters, but for hours and minutes it's the difference between an exact count and an estimate. Your birth certificate or baby book may have it.
How many seconds old am I?
The calculator above shows it counting live. It's about 31.6 million for every year, and you can find the exact moment you pass a billion seconds.
Is my birth date stored anywhere?
Only in your own browser, so you don't have to type it again on other pages of this site. It's never sent to us or anyone else.