Age Calculator
Calculate an exact age in years, months and days from a date of birth.
About Age Calculator
Calculate an exact age in years, months and days from a date of birth. NeroTool keeps this workflow simple and browser-based. Where supported, processing happens locally in your browser.
How to use this tool
Choose a date of birth and, if needed, a different reference date, then select Calculate age. NeroTool works from full calendar dates, so leap years and different month lengths are handled automatically.
Why manual age calculations go wrong
Subtracting a birth year from the current year ignores whether the birthday has already happened this year, and it does not account for varying month lengths or leap years. Working from full calendar dates avoids that class of off-by-one error.
Privacy
This tool is designed to work in your browser. NeroTool does not require an account for this workflow.
Frequently asked questions
How is exact age calculated?
It is calculated by comparing two full calendar dates and counting the complete years, months and days between them, rather than only subtracting years.
Does it account for leap years?
Yes, calculating from full dates naturally accounts for leap years and different month lengths.
Can I calculate the age between two dates other than today?
Yes, you can enter any two dates to see the exact duration between them, not only a birth date and today.
Is my date of birth uploaded anywhere?
The calculator runs in your browser, so the dates you enter are not intentionally sent to a NeroTool server.