Age Calculator
The Age Calculator can determine the age or interval between two dates. The calculated age will be displayed in years, months, weeks, days, hours, minutes, and seconds.
What is chronological age?
Chronological age is the amount of time that has passed from a person’s birth to a given date. It is commonly quoted in years, months, weeks, days, etc.
Chronological age is different to biological age because biological age takes into account different biological and physiological development factors including genetics, lifestyle, nutrition and health conditions. 1
How to calculate chronological age
To calculate your chronological age you need to subtract your date of birth from the current date. However, this is easier said than done because different months have a different number of days. February, for example, has 28 days in a normal year and 29 in a leap year. You can get a rough idea of how old you are in days by calculating as follows:
Using our chronological age calculator
When you enter a date of birth into our age calculator, the function subtracts that date from the current one (or one you enter) in order to return the difference between the two dates. It then formats the result to display it in chronological order – meaning that it displays years, months and then days. As a handy feature, you’re also able to find out statistics for the number of months & days, weeks and days individually.
This tool forms part of our age calculator tool. If you would like to discover more about your birthday – such as your star sign, birthstone, celebrities who share your birthday and the number one record on your birthday, try our birthday calculator.
🕒 Chronological Age Calculator – Calculate Your Exact Age in Seconds
What Is a Chronological Age Calculator?
A Chronological Age Calculator is an online tool that helps you find out exactly how old you are from your date of birth to a selected date—usually today. It calculates your age in years, months, days, hours, minutes, and even seconds.
Whether you’re a student applying for school admission, a patient needing age verification for healthcare, or just curious, this tool gives accurate, real-time results instantly.
Why Use an Online Age Calculator?
✅ Instant & Accurate – No manual calculations or guessing needed.
✅ Multiple Units – Know your age in months, days, hours, and seconds.
✅ Free & Easy to Use – No sign-ups or downloads required.
✅ Perfect for Forms & Documents – Helps fill in age-related fields with confidence.
How Does the Age Calculator Work?
Our age calculator simply requires two inputs:
Date of Birth (DOB) – When you were born.
Target Date – The date you want to calculate your age for (usually today).
It subtracts the birth date from the target date to compute your age down to the smallest unit of time.
🔍 Want to know how many weeks you’ve lived or how many days until your next birthday? This tool can help with that too!
Use Cases for Chronological Age Calculation
📅 School or College Applications
🏥 Medical Eligibility or Vaccination Scheduling
🎂 Birthday Countdown or Milestone Tracking
🧮 Genealogy or Historical Research
🏋️♀️ Sports & Fitness Age Verification