Age Calculator
Use this Age Calculator to calculate age, birthdays, retirement timeline, and total time lived in one place.
Calculate Age from Date of Birth
Use this Age Calculator to calculate age from date of birth instantly. Enter your birth date and a reference date to find your exact age in years, months, weeks, days, hours, minutes, and seconds.
The calculator also shows your next birthday countdown, half-birthday, birthday weekday, total time lived, and retirement estimates.
How to Use the Age Calculator
Using our age conversion tool is simple. All you have to do is follow these steps:
- Enter your selected date in the “Date of Birth” field.
- Enter another date in the “Find Age On” field. The current date is selected by default.
- Click Calculate.
- Review the detailed age report and time breakdown.
You can use future dates to calculate your age at a later point or historical dates to determine age in the past.
What Results Does the Age Calculator Show?
After entering your dates, the calculator provides a complete breakdown.
Your Exact Age
Shows your age in years, months, and days.
Age on Selected Date
Displays the date used as the reference point for calculation.
Date of Birth
Shows the birth date entered for calculation.
Date of Birth This Year
Displays when your birthday occurs during the selected year and identifies the weekday.
Half-Birthday
Shows the date exactly six months after your birthday.
Days Left Until Next Birthday
Displays the countdown until your next birthday.
Retirement Age Information
Retirement estimates are based on a default retirement age of 65. Actual retirement ages vary by country, employer, and personal circumstances. The calculator shows:
- Remaining duration until retirement
- Expected retirement year
Time Lived Summary
Shows total time lived in:
- Years
- Months
- Weeks
- Days
- Hours
- Minutes
- Seconds
Why Users Prefer This Age Calculator
Users choose this calculator because it offers more than a standard age result.
1. Exact age calculation
Calculate age accurately between any two dates with automatic handling of month lengths and leap years.
2. Multiple time formats
View age and date differences in years, months, weeks, days, hours, minutes, and seconds.
3. Birthday tracking features
See when your birthday occurs in the selected year, how many days remain until your next birthday, and your half-birthday date.
4. Retirement timeline estimation
Estimate how much time remains until retirement using a retirement age of 65 and see the projected retirement year.
5. Fast and simple
Enter two dates, click Calculate, and instantly view all results.
6. No installation or signup
Use the calculator directly in your browser.
Calculate Age Between Any Two Dates
This calculator works as both an age calculator and a date duration calculator.
You can use it to answer questions like:
- How old am I today?
- How many years have passed since my birth date?
- How many days old am I?
- How many weeks old am I?
- How many days have I been alive?
- What will my age be on a future date?
- What was my age on a past date?
- How much time has passed since an event?
- How much time remains until an event?
- What is the duration between two calendar dates?
You can also use the calculator to answer more specific questions, such as:
- If you were born in 2005, how old are you in 2024?
- If you were born in 2010, how old are you in 2023?
- How old is someone born in 2006?
- What year was I born if I am 16?
Since results are available in multiple units, you can analyze both short and long periods of time.
How Does Our Tool Calculate Age
Age calculation is based on the difference between the starting date and the ending date. Now, most age calculators are quite simple and therefore give wrong answers due to not accounting for leap years and 31-day months.
Our age calculator accounts for such specifics. For example, it accounts for:
- Actual calendar month lengths
- Leap years
- Day borrowing across months
- Year transitions
- Partial months and partial years
This allows the results to remain accurate even when calculating across leap years and different month lengths.
Why Time Can Be Shown Differently
Time duration can be represented in different ways depending on what you want to measure.
For example, a duration can appear as:
- 24 years 9 months 3 days
- 297 months
- 1,292 weeks
- 9,044 days
- 217,056 hours
Each format describes the same period but provides a different perspective. Our age calculator shows all of them simultaneously, so you don’t have to do different conversions inside your head.
Who Can Use Our Age Calculator?
This calculator is useful for many personal and professional situations. It can be useful in the following situations:
- Calculate someone’s current age from their date of birth
- Calculate a child's age in months, weeks, and days
- Younger students who are learning about time and date calculations for the first time
- HR teams are calculating service duration
- Researchers who want to compare historical dates and want to write them in different units of time.
- People tracking birthdays and milestones of either themselves or friends and family.
- Retirement planning users
- Anyone curious about how much time has passed since a specific day.
Track Birthdays and Life Milestones
Besides age calculation, the tool helps track meaningful milestones in life. These are mostly related to your birthdate. Here are some examples:
- When your birthday falls this year
- How long until your next birthday
- When your half-birthday occurs
- How much time remains until retirement
- Exactly how long you have lived
These insights make the calculator useful beyond simple date subtraction.
Age Calculation Examples
To give you a better idea of how our tool works, we have curated some examples that you can test and verify yourself.
Example 1: Find the Age of a Person on a Specific Date
Date of Birth: March 12, 2001
Find Age On: December 15, 2025
Result of Age Calculation:
Age in Standard Format: 24 years 9 months 3 days
Months lived: 297
Weeks lived: 1,292
Days lived: 9,044
Example 2: Future Age
Date of Birth: July 5, 1995
Find Age On: July 5, 2030
Result of Age Calculation:
Age in Standard Format: 35 years
Days left to birthday: 0
Months Lived: 420
Weeks Lived: 1,826
Days Lived: 12,784
Frequently Asked Questions
Can I calculate the age for any date?
Yes. You can calculate the age for any date. You can directly input a date rather than select it from a calendar dropdown menu, which makes it easy to add any date of your choice.
Does the calculator support leap years?
Yes. Leap years are automatically included in calculations. Aside from that, months with 28, 29, 30, and 31 days are also correctly accounted for.
Can I calculate the time between two dates instead of age?
Yes. The calculator works for age calculations and general date duration calculations. It will still give the answers in the context of age, but you can easily interpret them as the difference between two specific dates.
What retirement age does the calculator use?
The retirement estimate uses a fixed retirement age of 65. For now, you cannot change it, so all relevant calculations are still based on that number.
What is a half-birthday?
A half-birthday is the date that occurs six months after your birthday. Alternatively, you can say that the date six months before your next birthday is known as the half-birthday.
Why does the calculator show years, months, and days separately?
While the standard age format is useful, viewing your age in total months, weeks, days, hours, or minutes provides additional insight into how much time has passed.
Can I calculate age in weeks and days?
Yes. The calculator provides age in weeks as part of the total time lived breakdown. Aside from that, you also get it in years, months, hours, minutes, and seconds.
Is the ending date required?
The ending date defaults to the current date but can be changed to any date.
How old is someone born in 2006?
You can calculate that easily by entering today's date and the date of birth in 2006 into the age calculator. In 2026, the answer to that will be 19-20 years, depending on the exact date of birth.