Age Calculators

Your age is more than a single number, and these age calculators work it out from every angle. Enter a date of birth and get the answer as exact years, months, and days, as a running total of days lived, or in the specific form a particular task needs.

The Age Calculator is the place to start — it gives the full breakdown in years, months, and days, along with the total days you have been alive and the weekday you were born on. From there the tools fan out to more specific questions. The Age Difference Calculator compares two people's ages; the Age Calculator for School Admission checks a child against a cut-off date; and the Baby Age Calculator tracks a young child's age in months and days, where a few weeks really matter.

Every tool here handles the calendar honestly: real month lengths rather than a flat thirty days, leap years accounted for so a 29 February birthday is treated correctly, and only complete units counted — you are a given age right up until the day you turn one year older. The maths runs entirely in your browser, so a date of birth is never sent anywhere.

Prefer a plain-English explanation first? The guide on how age is calculated walks through the method step by step, then hands you back to the calculator.