Age Calculator
Enter a date of birth to get the exact age in years, months and days — plus a few fun extras.
How exact age is calculated
Age counts completed calendar units: the years figure increases only on each birthday, then months since the last birthday, then days since the last month-boundary. Because months have different lengths, "X years, Y months, Z days" is the precise form used on official documents — this calculator computes it the same way.
Frequently asked questions
How are leap-year birthdays (Feb 29) handled?
In non-leap years the birthday is counted on March 1 — the most common legal convention. Total-days figures are exact regardless.
Can I calculate age at a past or future date?
Yes — set the second field to any date to get the age as of that day. Useful for forms that ask "age on 1 September".
Last updated: 2026-07-13