Age Calculator

An age calculator works out exactly how much time has passed between a birth date and a chosen target date, broken down into years, months, days, and even hours and minutes. It sounds trivial, but doing it by hand is error-prone because months have different lengths and February gains a day in leap years. This tool uses the browser's native date arithmetic, which already knows that 2024 had a 29-day February while 2023 did not, so the count stays correct across any span. Enter a date of birth and, optionally, an "as of" date; if you leave the target blank it defaults to today. The result is a full breakdown plus the total number of days lived and a countdown to the next birthday. The breakdown follows the calendar convention people expect: someone born on 15 June 1990, measured on 15 April 2026, is 35 years, 10 months, and 0 days old, not a rounded 36. This calendar method is also why a person born on 29 February only sees that exact date return every four years, though the tool still counts their age correctly every year in between. Because the calculation is sensitive personal data, privacy matters: many age tools log the birth date, tie it to your IP address, or feed it to ad targeting. Here the date math runs entirely in your browser, so a birthday, or the birth dates of family members you check, never reaches a database. Use it to fill in forms that ask for exact age on a specific date, to verify eligibility cutoffs, to calculate an ancestor's age from census records, or simply to see how many days you have been alive.