Age Calculator
Find your exact age in years, months and days, plus total days and days until your next birthday.
🔒 Runs in your browser. Nothing you enter is uploaded or stored.
How to use it
Enter a date of birth. The “age on” date starts as today, but you can change it to find someone’s age on any date, such as a school cut-off date.
Age is counted in whole years, then months, then remaining days, the way people normally state an age. Someone born on 29 February has their birthday counted on 1 March in non-leap years.
FAQ
Why are the total days not years × 365?
Leap years add an extra day roughly every four years, and the calculator counts the real calendar days between the two dates.
Related tools
Date Difference CalculatorCount the days, weeks, months and weekdays between two dates.Countdown TimerA simple online countdown timer with an alarm sound. Set hours, minutes and seconds.BMI CalculatorCalculate body mass index (BMI) for adults in metric or imperial units. General information only, not medical advice.