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Work out an exact age in years, months, and days from a date of birth — plus total days, weeks, months, and hours lived, the weekday you were born on, and a countdown to your next birthday. Calendar-accurate math handles leap years and short months correctly (Feb 29 birthdays included).
Fill forms that need a precise age, check school-enrollment or retirement cutoffs, or settle the "how many days old am I" question. Everything computes locally in your browser — no sign-up, no data leaves the device.
In whole calendar units: complete years first, then complete months, then leftover days — the same convention used on official forms. That is why someone born January 31 turns exactly one month older on February 28/29 boundaries with the day clamped.
Leap-day birthdays roll to February 28 in non-leap years (the common convention), and the next-birthday countdown follows the same rule.
School enrollment, insurance, and some medical dosing rules depend on the exact breakdown, not just the year count. This tool gives you all three numbers in one glance.
PureKit · age-calculator · Free online tool — files processed locally in your browser, no upload.