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Age calculator
Calculate calendar age in years, months and days on a date you choose.
Your result
A little input. A useful result.
Adjust the example inputs, then select Calculate age.
About this tool
Find a calendar age from a date of birth and an as-of date. This tool also reports total days and days until the next birthday; it uses 28 February for a leap-day anniversary in a non-leap year.
How to use it
- 1
Enter the date of birth.
- 2
Choose the date on which you want to calculate the age.
- 3
Calculate full years, remaining months and days, plus the next birthday countdown.
Questions, answered
How are 29 February birthdays handled?
In a non-leap year, this calculator treats 28 February as the anniversary. This is a stated calendar convention; legal age rules can use a different convention.
How are months with different lengths handled?
Full months are counted from the most recent birthday, clamping the day to the last day of shorter months. Remaining days are then counted from that monthly anniversary.