Age Difference Calculator

Created by Rita Rain
Reviewed by Dominik Czernia, PhD and Jack Bowater
Last updated: Feb 02, 2023

This age difference calculator lets you quickly determine the age gap between two people. In the text below, you can learn how to use the age gap calculator and find a few titbits about the age difference in relationships.

Age difference calculator

Using the age gap calculator, you're probably here to check the age difference between two people. Here's the fastest way to do it:

  1. Input the age of one person. By default, the unit is set to years, but you can choose a different one. The smaller the units, the more precise the result.

  2. Enter the age of the other person.

  3. The age difference will display at the bottom of the age gap calculator. You can convert the time to various units. Or you can use our time unit converter beforehand to have appropriate units of time.

You can also calculate age from years of birth, although this will be less accurate. In this case:

  1. Set the method to "From years of birth".

  2. Enter the first person's birth year.

  3. Input the year of birth of the other person.

  4. The age gap will show in the last field of the age difference calculator.

If you want a more precise result and know the dates of birth:

  1. Select "From dates of birth" in the first field of the age difference calculator.

  2. Enter the date of birth of one person.

  3. Enter the date of birth of the other person.

  4. The result will appear in the last field of the age difference calculator. The result will be more precise, and you can display it in the units of your choice.

  • We also have a birthday calculator that accurately tells you when your birthday is. If that sort of question might ever concern you, now you have a tool to be sure.
  • And we have a tool that tells your age in years, months, weeks, days, minutes and seconds, check out the chronological age calculator.

Age difference between Charles and Diana - an example using the age gap calculator

As we all know, there's nothing as fascinating as random bits of information about the British royal family. That's why we'll use the age difference between Charles and Diana as an example calculation in this age gap calculator.

  1. Since we know the exact dates of birth (thank you, Internet, what would we do without you) - let's choose "From dates of birth" in the first field of the age difference calculator.

  2. Let's enter Diana's date of birth - 1 July 1961. The easiest way is to type "Jul 1, 1961" and click "enter". You can also click the calendar icon and choose a year, a month, and a day.

  3. In the third field, let's enter Charles' date of birth - 14 November 1948 (type in "Nov 14, 1948").

  4. In the bottom field of the age gap calculator, we can find the result - Diana was 12 years, 7

months, and 15 days younger than Charles.

You might want to take a look at the day counter to count the days between two dates. And if you get lost in the maths of calculating your age from your date of birth, try out the age calculator and make your life easy.

This brings us to the fun-fact part of this tool - age differences in relationships.

Age difference in relationships

In the US, in around one-third of marriages, the age difference equals up to one year. In 19.6% of marriages, a husband is 2-3 years older than his wife, while only in 6.9% of married couples a wife is 2-3 years older than her husband. This exemplary data seems to confirm the age differential effect - a documented, cross-cultural phenomenon of men preferring younger women and women preferring older men.

Why does this pattern occur? According to evolutionary psychology, men favor young women because of their increased fertility, while women look for the ability to gain resources, which older men tend to have more of. All of this ensues that genes can be successfully passed on and that the offspring survives.

Rita Rain
From age
Age 1
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Age difference
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