Age Calculator | Online Age Calculator by Date of Birth
Fast & Free Age Calculator Online

Age Calculator

Quickly turn your date of birth into your exact age in years, months, days, total days lived, and a friendly countdown to your next birthday with this chronological age calculator.

Enter your date of birth Calculator

This simple age calculator checks your date of birth against today’s date to show your precise age. It works like a human-friendly age calculator by date of birth that updates instantly as you pick a new date.

Choose your full date of birth. Future dates are not allowed.
Exact age
Your exact age will appear here.
Select your date of birth to see how many years, months, and days you have lived.
Lifetime overview
Total days lived:
Your birthday countdown will appear here once you add your date of birth.
Birthday age calculator
Age calculator by date
Age calculator online

This age calculator focuses on your chronological age, not your biological age.

How to use this age calculator

Using this age calculator online is intentionally simple so anyone can use it without technical skills. Here is how it works in a few easy steps:

  • Pick your date of birth using the calendar field above. The tool works as an age calculator by date of birth, so the more accurate your date, the better the result.
  • Click the Calculate age button, or simply change the date. The result area will update with your exact age in years, months, and days.
  • Check your total days lived and see the friendly next birthday countdown in days.
  • Use the Clear button anytime to reset the input and start over for someone else.

Think of it as a quick, human-readable version of the many age tools you see online—like a basic chronological age calculator instead of a complex biological age calculator or metabolic age calculator. You get the information you actually need without any extra noise.

FAQs about this age calculator

What does this age calculator actually do?

This tool acts as a straightforward age calculator and birthday age calculator. You select your date of birth and it calculates your exact age in years, months, and days, along with total days lived and a countdown to your next birthday.

Is this a chronological age calculator or a biological age calculator?

This is a chronological age calculator. It uses your calendar date of birth and today’s date to work out your age. It does not measure your health-based biological age, metabolic age, or any medical markers.

Can I use this as an age calculator by date of birth for official forms?

Yes, you can use this age calculator by date of birth or age calculator by date to double-check your age for forms, applications, or documents. It simply mirrors the way a standard calendar works.

Does this work like a retirement age calculator or social security retirement age calculator?

No. This page focuses only on your present age. A retirement age calculator or social security retirement age calculator usually factors in local laws, contribution years, and financial rules. You can, however, use the age shown here as the starting point for those tools.

Is there a difference between this and a Korean age calculator?

Yes. A Korean age calculator often counts age differently based on cultural conventions. This age calculator uses the international standard: you are 0 at birth and gain one year every birthday.

Does this tool handle newborns, gestational age, or adjusted age?

This page is not a clinical gestational age calculator or adjusted age calculator. It is designed for general everyday use. For medically sensitive cases, always rely on dedicated healthcare tools and professional guidance.

Can I use this for my pet with a dog age calculator or cat age calculator?

You can technically enter your pet’s birthdate, but this tool will show their age in human calendar years. A dedicated dog age calculator or cat age calculator will often convert those years into an approximate “pet age” equivalent in human terms.

Simple, human-friendly age calculator by date of birth — built to be fast, clear, and easy to use.