About this tool
This calculator is for anyone curious about their age in raw units rather than the usual years-months-days format — useful for milestone countdowns (your 10,000th day alive, for example), or just as a fun fact to share. Adding your birth time makes the hours, minutes and seconds precise rather than estimated from midnight.
How to use it
- Enter your date of birth.
- Optionally add your birth time for second-by-second precision.
- Watch your total days, hours, minutes and seconds update live.
Frequently asked questions
Why would I add my exact birth time?
Without it, the calculator assumes midnight, which is accurate to the day but can be off by several hours for hours/minutes/seconds. Adding your real birth time makes those figures precise.
Does this account for leap years?
Yes — the total is calculated from the actual calendar difference between your birth date and now, so leap years are automatically included correctly.
Is my birth date sent anywhere?
No — the calculation happens entirely in your browser. Your date of birth is never sent to a server or saved.