Purpose
This site exists to make simple date math less annoying. Instead of opening a spreadsheet or counting on a calendar, visitors can enter a birth date and get a plain-English answer immediately.
The core calculator gives exact age in years, months, and days. Supporting tools convert age into days, weeks, months, hours, minutes, and seconds, compare two birthdays, count down to a birthday, and find milestone birthday dates.
Important limitations
How Old Calculator is informational, not a legal, medical, financial, or government authority. For eligibility decisions, verify the result with the organization responsible for that rule.