Age Calculator

Enter the date of birth in the given tool to calculate the age of a person, place, or thing.

Select Your Date Of Birth

Created by Helen Stark
Helen Stark
Helen Stark

Student of Harvard university, she loves to observe new things about society, she studies Wikipedia more and learns about quantum physics on the internet. She loves dancing and singing songs.

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Reviewed by Nick Walker
Nick Walker
Nick Walker

Done PHD of nuclear physics from the University of Pennsylvania. He is always seeking ways to explain science in easy terms. Moreover, he loves coffee & its beans more than his girlfriend (not at all).

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This age calculator calculates the exact age of a person or a thing on any particular day based on the birthdate. 

With this tool, you can also figure out the interval between the two dates.

Age is counted differently in various cultures of the World. Today, the Gregorian calendar is most commonly used to calculate age. It considers the age of newborns as a zero and after one year the age becomes one. 

But in many cultures like in East Asia, and China the age reckoning is different. The age of the newborn depends upon the new year. It makes the difference of approximately one or two years in the ages between the West and East systems. But don’t fret! you can use our lunar age calculator for Eastern counting systems. This tool is specifically designed to calculate the age of a person according to the Chinese Lunar Calendar. 

How To Calculate How Old Am I?

The method of age calculation requires a comparison of a person's birthdate with the date upon which you want to calculate the age.

To calculate how old you are:

Note down the date of birth, and current date and subtract both of these dates.

Now here, the complexity is introduced when different dates are to be dealt with!

Subtract the Number of Days:

  • Subtract days in the current date and birth date
  • If days in the current date are greater, proceed with subtraction
  • If days in the current date are smaller, subtract 1 month from the current year's months and add 30.5 to them
  • Now subtract the birthdays from the current year's days

Subtract the Number of Months:

  • Follow the same procedure as mentioned for day calculations. Remember that if you want to carry 1 year, add 12 months to the current year months

Subtract the Number of Years:

  • Simply subtract your birth year from the running year

Running short on time and needing to find the age of a particular person, get assistance from the age calculator online. It allows you to conveniently calculate the age of someone without manually counting the years, months, and days. 


The date of birth of John is July 26, 1985. Now how to find his age on January 29, 2024


Age of a Person = Given date - Date of birth.

Ron's Date of Birth = July 26, 1985.

Given date = January 29, 2024.

Now the current month < birth month. So consider 2024 - 1 = 2023 as the current year and 

also do 12 + 1 (Jan) - 7 (July) = 6 months

Years' Difference = 2024 - 1985 = 39 years

Number of remaining days = 3 days

The age of John is 39 years, 6 months, and 3 days

Date Formats:

There are different orders to write the age which include:

US Date:

  • mm/dd/yyyy
  • mm.dd.yyyy
  • mm-dd-yyyy

European Date:

  • mm/dd/yyyy
  • mm.dd.yyyy
  • mm-dd-yyyy

International Date:

  • Yyyy-mm-dd


What Is Running Age?

Running age refers to your age in terms of the current year of life. In simple words, it means your age on the current running date by considering your date of birth. 

How Old Am I In Months?

To find your age in months:

  • Multiply the number of years by 12
  • Divide days by 30.5
  • Sum the output to get the age in months

How Old Will A 11 Year Old Be In 2050?

The boy who is 11-year-old today will be 38 years old in 2050.

Related: You can also calculate how old you are in Korea with our Korean age calculator which calculates your age according to the Korean age reckoning system.