Enter a birth date (and optionally 'as of' another date) to see the exact age in years, months, days, weeks and total hours — computed instantly.
Birthdays are easy; "exactly how many days old are you" is not. This calculator settles it — years, months, days, even weeks and total hours if you're feeling philosophical.
Type a birth date and it shows the age right now. Leave the second box empty for today, or fill it in to check someone's age on a specific date — handy for eligibility cutoffs and anniversaries.
It's the tool behind "how old was I when…", age verification math, and the classic "I'm 10,000 days old" party.
Nothing is stored: the date stays in your browser and the math runs here. (Anonymous analytics only — privacy policy.)
Quick tip: if you put the "as of" date before the birth date, the boxes go blank on purpose — you can't be born after the day you're checking.
Enter a birth date and optionally an 'as of' date; the exact age in years, months, days, weeks and hours appears instantly.