Age Calculator
Find your age in years, months and days from your date of birth. You can also choose a different date to calculate your age on a past or future day.
Your result will appear here.
How age is calculated
The calculator compares your date of birth with the selected “Age on date” and returns completed years, months and days. It accounts for different month lengths and leap years using calendar dates.
When can I use an age calculator?
Use it to check an age on a specific date for planning, forms or personal reference. Always follow the exact age rules required by the organisation requesting the information.
Worked calendar example
Suppose a person was born on May 15, 1990 and the selected calculation date is November 8, 2026. The elapsed calendar age is 36 years, 5 months and 24 days. The calculator compares calendar anniversaries and month lengths; it does not simply divide the total number of days by 365.
For a February 29 birth date, the anniversary in a non-leap year is treated as the last valid day of February by this calculator. Legal forms, school admission, insurance and immigration rules may define age cut-offs differently, so use the date rule requested by the organisation.
Frequently asked questions
Can I calculate age on a past date? Yes. Choose any date on or after the date of birth.
Does it account for leap years? Yes. The calculation uses calendar dates, including February 29 in leap years.
Related guide: How to calculate age from a date of birth includes a step-by-step calendar example.