Find your exact age and days until your next birthday
This age calculator takes a single input — your date of birth — and works out your exact age in years, months, and days, plus a countdown to your next birthday. Everything runs locally in your browser; the date you enter is never sent anywhere.
Pick your birthdate with the date picker (future dates are blocked) and press Calculate or hit Enter. Below the main result you'll also see your total age expressed as months, weeks, days, and hours, the day of the week you were born on, and the full date of your next birthday.
Ages aren't as simple as dividing days by 365, because months have different lengths. This calculator does what people mean when they state an age: it counts whole calendar years first, then whole months, then leftover days. If the day of the month hasn't been reached yet, it borrows the actual length of the previous month rather than assuming 30 days. So someone born January 31 is exactly one month old on the last day of February, whether that month has 28 or 29 days.
No. The calculation happens entirely in your browser with JavaScript. The date you enter never leaves your device and is gone when you close the tab.
Some tools approximate a month as 30.44 days; this one counts real calendar months and borrows the actual length of the previous month when days go negative. Results can differ by a day or two near month ends, but calendar counting matches how ages are normally stated.
Yes. All the date math uses real calendar dates, so February 29 birthdays and leap-year day counts are handled correctly. Totals like days and hours come from the true elapsed time between your birthdate and now.
The countdown box switches to "It's your birthday today!" instead of showing a number, and the next-birthday date rolls forward to the same day next year.