Online Age Calculator

Welcome to our Online Age Calculator.

Here you will find our age converter which will tell you exactly how old someone is in years, months, days, hours, minutes and seconds.

Online Age Calculator

Online Age Calculator

Enter date of birth:



Enter date to:




How the Age Calculator works

Enter the person's date of birth.

Optional: type in the time of birth if you know it (the default time is the current time).

Optional: type in the date and time you want to go up to (the default date is today's date and time).

Next click the Convert button to convert the age into a variety of different formats.

Age Calculator Notes

The age calculator calculates the time interval between two dates and changes it into a variety of formats.

However when dealing with months, there are different ways that you can interpret the time interval.

The Problem with months

From February 28th to March 31st could be said to be one month as the interval is from the end of February to the end of March.

It could also be said to be one month and three days because February 28th to March 28th is one month and then you have to add on three extra days.

This problem become even more complicated when looking at intervals between, say January 20th and March 10th.

Our calculator works out the months problem as follows:

  • Time interval from January 20th to March 10th
  • Step 1) We add a month to January 20th to get to February 20th.
  • Step 2) We add 8 days to get to the end of February (9 days if it is a leap year).
  • Step 3) We add 10 more days to get to March 10th.
  • So our calculator would say that this is 1 month and 18 days (or 1 month and 19 days if it is a leap year).

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Time Conversion Calculators

Our time calculators will allow you to convert any digital time into a military time, and back.

We also have a decimal time converter which will take a time in hours, minutes and seconds and then convert it to a decimal number which represents that time. This calculator will also take a decimal time and convert it to hours, minutes and seconds.

Time Puzzles

Looking for an extension activity for children who can already tell the time?

Maybe you want an interesting starter activity for your lesson to get the class thinking?

These printable time puzzles will help to get your child thinking about time and solving problems involving time.

They are good at developing an understanding of the language used in time.

We hope you have found this webpage on how to convert time to decimal useful!


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