🎂 Age Calculator
Calculate exact age in years, months, days — and days to next birthday.
How to Use the Age Calculator
Follow these steps for best results.
Why Use This Tool?
A simple year subtraction gives the wrong answer for anyone who has not yet had their birthday in the current year. This tool accounts for the month, day, and varying lengths of months including leap years, producing a legally and medically precise age useful for eligibility checks and milestone planning.
Frequently Asked Questions — Age Calculator
Common questions about this tool.
About Age Calculator
Age is not simply the difference between two calendar years — it is a precise calculation accounting for the day and month of birth, the number of days in each month, and leap years. This level of precision matters in legal, medical, financial, and administrative contexts where an exact age in years, months, and days is required. Enter any date of birth and a reference date to see the exact age, total days lived, total weeks, and days until the next birthday. Change the reference date to calculate projected age at any future point.