Calculate Your Age
Results are estimates for informational purposes only and may not be suitable for official or legal use.
What is an Age Calculator?
The Age Calculator helps you accurately determine your current age in years, months, and days based on your date of birth. In most countries, age increases on a person's birthday — for example, if someone has lived for 3 years and 11 months, their age is considered 3 years, and it will increase to 4 years on their next birthday. This is the standard age system used in most Western countries and is the most commonly accepted age calculation method worldwide.
However, different cultures use different age counting systems. For instance, in some Asian traditions, including the traditional Chinese age system, a person is considered 1 year old at birth, and everyone’s age increases together at the Chinese New Year, not on their individual birthdays. So, a baby born just one day before the Chinese New Year would be considered 2 years old two days later, even though they are only two days old.
Our online age calculator allows you to easily understand your age according to different cultural systems. Whether you want to find your exact age today, calculate your international age, or learn how age is calculated in different countries, this free age calculator tool gives you accurate and instant results.
How to Use the Age Calculator
Enter Birth Date
Select your date of birth using the date picker or type it manually.
Instant Calculation
The calculator automatically computes your age as soon as you enter the date.
View Results
See your exact age in years, months, days, and more detailed breakdowns.
Why Use Our Age Calculator?
Accurate Calculations
Precise age calculations accounting for leap years and calendar variations.
Multiple Time Units
View your age in years, months, weeks, days, hours, and minutes.
Completely Free
No registration, no hidden fees, unlimited calculations.
User-Friendly Interface
Simple, intuitive design that works on all devices.
How to Calculate Age Manually
Calculating age seems simple, but getting it right down to the day requires careful subtraction and “borrowing” from months and years, similar to long subtraction in math. This age calculator automates this process, but here's how it's done manually:
Step-by-Step Age Calculation
Subtract the Days
Subtract the birth day from the current day. If the current day is smaller, borrow one month from the current month and add the number of days in the previous month before subtracting.
Subtract the Months
Subtract the birth month from the current month (adjusting for any borrowed month). If needed, borrow one year and add 12 to the current month.
Subtract the Years
Subtract the birth year from the current year (after any borrowing). This gives the completed number of years.
Combine the Results
Combine years, months, and days to express the final age clearly.
Handling Leap Years
An accurate age calculator must correctly handle leap years. Leap years occur to keep our calendar aligned with the Earth's orbit and add February 29 to certain years.
- 1. The year must be divisible by 4.
- 2. If the year is divisible by 100, it is not a leap year unless...
- 3. The year is also divisible by 400, in which case it is a leap year.
This calculator automatically incorporates these rules for precise day-level calculations.
Chronological Age vs. Biological Age
When you ask “how old am I?”, you are asking for your chronological age. However, there is another important measure: biological age, which reflects how your body is aging internally.
Chronological Age
This is the number of years that have passed since you were born. It is a fixed, calendar-based measure used for legal and administrative purposes.
- ✓ Based on your date of birth.
- ✓ Measures time passed since birth.
- ✓ Linear and cannot be changed.
- ✓ Used for legal age limits and eligibility.
Biological Age
Biological age describes how old your body appears based on health markers such as fitness, metabolism, and cellular aging.
- ✓ Reflects your current health and lifestyle.
- ✓ Influenced by genetics, diet, exercise, and stress.
- ✓ Can be younger or older than your chronological age.
- ✓ Often used to estimate healthspan and longevity.
Why Does It Matter?
A person who is chronologically 50 but has a biological age of 40 may be aging more slowly and have a lower risk of certain age-related conditions. A higher biological age than chronological age can signal the need for healthier habits.
This age calculator measures chronological age only. Biological age estimates require medical or specialized wellness tests and should be discussed with qualified professionals.
How Age is Counted Around the World
While the Western method of counting age from the day of birth is the most widely used, some cultures use alternative age-reckoning systems that can make a person appear older or younger on paper.
East Asian Age Reckoning
In some traditional East Asian systems, a person is considered one year old at birth, and age increases by one for everyone at the New Year (often Lunar New Year), not on individual birthdays.
Example: A baby born shortly before the New Year may be considered 2 years old just days after birth under this system, even though they are only a few days old by Western counting.
Because of these differences, the same person can have two different ages depending on which cultural system is used.
Frequently Asked Questions About Age Calculator
How do I calculate my exact age?
To calculate your exact age, simply enter your date of birth in the age calculator tool. The calculator will automatically compute your age in years, months, days, hours, and minutes from your birth date to today's date.
What is a chronological age calculator?
A chronological age calculator determines the amount of time that has passed from your date of birth to the current date or a specific date. It calculates your age in multiple units including years, months, weeks, days, hours, and minutes.
How many days old am I?
Use our age calculator to find out exactly how many days old you are. Enter your birth date, and the tool will show your age in days, along with other time units like months, hours, and minutes.
Is this age calculator free to use?
Yes, our age calculator is completely free to use with no registration required. You can calculate your age or anyone else's age as many times as you want without any charges.
Does the age calculator account for leap years?
Yes, our age calculator automatically accounts for leap years, ensuring accurate age calculations down to the day. The tool considers all calendar variations for precise results.
Can I calculate age between two specific dates?
Yes, you can use the age calculator to find the difference between any two dates. Simply enter the start date (birth date) and the tool will calculate the time elapsed to today or any specified date.