Find your exact age in seconds

What the age calculator does

An age calculator measures the distance between two calendar dates and expresses it the way humans actually think about age — in completed years, months and days. Tell it your date of birth and today’s date and it reports how old you are right now. Change the second date and it tells you how old you were, or will be, on any other day.

Working age out by hand is fiddly because months have different lengths and leap years add an extra day every four years. This tool sidesteps all of that by working directly with real calendar dates, so the result is exact rather than an approximation. Alongside the familiar years-months-days figure, it also converts the same span into total weeks, days, hours, minutes and seconds — handy for milestone birthdays, project deadlines or simple curiosity.

How to use it

1. Enter your date of birth using the month, day and year fields, or tap the calendar picker.
2. Set the “age at” date. It defaults to today, so you usually don’t need to touch it. Change it to check your age on a past or future date.
3. Press Calculate. Your age appears instantly, broken down several ways.

Why ages differ between cultures

The number this tool shows follows the international (Western) system: you are zero at birth and gain a year on each birthday. That isn’t universal. In the traditional East Asian age system, a newborn is considered one year old, and in some customs everyone adds a year at the lunar new year rather than on their individual birthday. The result is that the same person can be a year or two “older” depending on the tradition. If you’re curious, our guide on how age is calculated around the world walks through each system with examples.