Age Calculator
Calculate age in years, months, and days from a birth date.
About this tool
ToolAlto's Age Calculator calculates the time between a date of birth and today, showing the result in years, months, and days.
For a step-by-step explanation, see How to Calculate Age from a Date of Birth.
How to use it
- Enter your date of birth.
- Click Calculate age.
- Review your age in years, months, and days.
Understanding the result
Your age is shown as a calendar difference in completed years, months, and days. Because calendar months have different lengths, the result is not calculated by simply dividing a number of days by 365.
The calculator uses today's date automatically. For birthdays near the end of a month or around leap years, the displayed months and days can differ from a simple day-count estimate.
Frequently asked questions
How does an age calculator work?
It calculates the calendar difference between your date of birth and today, accounting for different month lengths and leap years.
Can I calculate my age on a future date?
This version calculates your age as of today.
Is this age calculator free?
Yes. ToolAlto's online tools are free to use.