What are Different Ways To Calculate Age?

What are Different Ways To Calculate Age?

In the following article, you will learn how to calculate age in different ways.

Method # 01: 

Age Calculation by Using Date of Birth & Current Date

By using your accurate date of birth and current date, you can calculate age in different frequencies including:

  • Years
  • Months
  • Weeks
  • Hours
  • Minutes
  • Seconds

While calculating age this way, keep in mind that you have to consider the total number of days in each month and leap years as well.

  • Minus the year of birth from the current year to calculate age in years
  • Now if you see the birth month is bigger than the current month, go by subtracting the digit 1 from the years calculated in step # 1
  • If both the months are equal, you have to move to the days
    If birth year days are greater than that of the current day, straightforwardly subtract 1 year from the number of years in step # 01
  • To calculate the remaining months, simply subtract the month of your birth from the current month
  • At the end, the remaining days can be calculated by subtracting the birthday from the current day

That’s all!


Let’s make a supposition that you were born on July 11, 1995. As of the current date (August 24, 2024), your age is calculated as follows:

Current Year - Birth Year = 2024 - 1995 = 29 years

Birth Month > Current Month? No.

Birth Month = Current Month, Birth Day > Current Day? No.

Then we have:

Remaining Days = 24 - 11 = 13 days

Remaining Months = 8-7 = 1 month

Method # 02

Use Age In Days To Calculate Age

The age in days can also be used as a more precise way to compute age. By taking into account the precise number of days that have passed between the birthdate and the present date, this method yields an accurate computation.

  • Determine how many days there are between the current date and the birthdate.
  • To find the age in years, divide the total number of days by 365.
  • After dividing the total number of days by 365, discover the residual to get the number of days that are left.
  • To find the age in months, divide the remaining days by 30.


Consider the previous example again in which we had:

  • Birth date = July 11, 1995
  • Current date = August 24, 2024

Age Calculation In Days:

Number of dates between current date and birthdate = 10,637 days

Age in years = 10,637 days/365 = 29 years 

Days remaining = 10,637 days% 365 = ?

Here we have:

10637 % 365:

This is the modulo operation, which returns the remainder when 10,637 is divided by 365.

10,637 divided by 365 equals 29 with a remainder of 178.

So, 10,637 % 365 equals 178.

= 178 days:

The result of the modulo operation (178) represents the remaining days after dividing 10,637 by 365.

So, the remaining days are 178.

Age in Months = 178/30 = 5.9 months

Remaining Days = 5.9%30

By applying the same modulo operation, we get:

Remaining days = 6 days

Method 3: 

(Age Calculation Using Excel)

For those comfortable with spreadsheet software like Microsoft Excel, you can utilize its built-in functions to calculate age in years, months, and days accurately. Excel offers the DATEDIF function, which calculates the difference between two dates in various units, including years, months, and days.

To calculate age using this function:

  • In cell A1, enter the birth date.
  • In cell B1, enter the current date.
  • In cell C1, use the formula =DATEDIF(A1, B1, "y") to obtain the age in years.
  • In cell D1, use the formula =DATEDIF(A1, B1, "ym") to obtain the age in months.
  • In cell E1, use the formula =DATEDIF(A1, B1, "md") to obtain the age in days.
  • Excel will display the calculated values for age in years, months, and days based on the given dates.


How Accurate Are These Age Calculation Methods?

Highly accurate! Yes, these methods can be applied for leap years and varying number of days for each month. This is why, they provide you with accurate calculations of the age.