Age calculator: years, months and days

How to use the tool

Compare age on the reference date with the time until the next birthday. Today uses the device’s local date.

1. Enter a birth date and the date on which you want to know the age.
2. Read years, months, days, total days and the next birthday.

Method and principles

Age is a calendar difference, not a day count divided by 365.

If the original day does not exist in the target month, the last day of that month is used.

Method and limits

Dates from years 1 to 9999; birth cannot follow the reference date. February 29 is treated as February 28 in non-leap years. The result does not determine legal age eligibility.

Inputs and results are processed in your browser and are not sent to the server. Aggregate statistics, when enabled, record only the tool and outcome, without the content.

Example

From May 15, 1990 to May 15, 2026: 36 years, 0 months and 0 days; the birthday is on the reference date.

Result details