Age Calculator
Calculate your exact age in years, months, days and total days.
About the Age Calculator
An age calculator finds the difference between two dates and expresses it in years, months, and days. You can also see the total number of days between the dates.
How to use this calculator
- Enter the date of birth or starting date.
- Choose the date on which you want to calculate the age.
- Review the exact years, months, and days.
- Use the total-days result when you need the full elapsed-day count.
How the calculation works
The calculator compares the year, month, and day components of the two dates and adjusts for month boundaries. It also calculates the total elapsed days between the dates.
Example
If a person was born on January 1, 2000, entering a later date gives an age expressed as completed years, months, and days rather than only an approximate number of years.
Things to keep in mind
- Use the exact date of birth for the most precise result.
- Age in years is not the same as simply dividing total days by 365.
- For legal or official purposes, confirm the applicable date rules with the relevant authority.
- You can set the second date to a future or past date for planning and date comparisons.
Frequently asked questions
How is exact age calculated?
Exact age compares the birth date with the target date and counts completed years, months, and remaining days.
Does a leap year matter?
Yes. Calendar dates and the number of days in each month affect the exact date difference.
Can I calculate age on a future date?
Yes. Choose the future date in the Age on field.
Is age calculated from total days divided by 365?
No. The exact age display uses calendar years, months, and days rather than a simple 365-day approximation.