Age Calculator

Calculate exact age in years, months, and days from a birth date.

Age Calculator helps you exact age in years, months, and days from a date of birth. Enter date of birth and age on this date, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Age calculator does Age Calculator is built for dates, durations, ages, and schedules. Exact age in years, months, and days from a date of birth. You enter date of birth and age on this date, then Simple Calculators computes the result instantly. Calendar math follows common civil-calendar rules used in everyday planning. How the math works Subtract birth date from the “as of” date, borrowing days from the previous month and months from the previous year when needed. The formula: Age = (as-of date) − (birth date), counted in years, months and days. When days or months come out negative, borrow a month or a year. This is not total days ÷ 365.25, which would drift.