Enter the number of years, months, and days into the calculator to determine the age in days.

Age In Days Formula

The following formula is used to calculate age in days.

A = (Y * 365) + (M * 30) + D


  • A is the age in days
  • Y is the number of years
  • M is the number of months
  • D is the number of days

To calculate the age in days, multiply the number of years by 365 (the number of days in a year), then add the product of the number of months and 30 (the average number of days in a month). Finally, add the number of days to the result.

What is an Age In Days?

Age in Days is a measure of how old someone or something is, expressed in the total number of days since their birth or inception. Instead of using years, months, or weeks, this measurement breaks down the age into the smallest commonly used unit of time, providing a more precise calculation of age. For example, if a person is 25 years old, their age in days would be approximately 9,125 days, considering a year as 365 days.

How to Calculate Age In Days?

The following steps outline how to calculate the Age In Days using the given formula:

  1. First, determine the number of years (Y).
  2. Next, determine the number of months (M).
  3. Next, determine the number of days (D).
  4. Next, use the formula A = (Y * 365) + (M * 30) + D to calculate the age in days.
  5. Finally, insert the variables and calculate the result.

Example Problem:

Use the following variables as an example problem to test your knowledge:

Y = 2 (number of years)

M = 6 (number of months)

D = 15 (number of days)