How to Use the Time Lived Since Birth Calculator
Ever wonder exactly how many seconds you've been alive? Enter your date of birth and this calculator instantly shows the time you've lived so far as an age, total days, total hours, total minutes, and total seconds. If you know your birth time, add the hour and minute for an even more precise result.
Don't worry if you don't know your exact birth time — leaving the hour and minute fields blank defaults to midnight (00:00), which keeps the margin of error to less than a day. It's also a fun way to spot a milestone coming up, like the day you'll pass one billion seconds alive.
Age is calculated based on whether your birthday has passed this year — if it hasn't, one year is subtracted from the raw year difference, which is the standard way age is calculated in the US.
Frequently Asked Questions
Leave the hour and minute fields blank and the calculator uses midnight (00:00) as the default, which is off by at most a day from your actual birth time.
If your birthday hasn't happened yet this year, one year is subtracted. In other words, age is calculated based on whether your birthday has passed.