Age Calculator
Age Calculator – Know Your Exact Age in Years, Months, Days, and More
Our Age Calculator helps you quickly determine your current age from your date of birth. Whether you want to find your age today or on a future date, this tool gives accurate results in years, months, and days.
You can also use this calculator to measure the exact time difference between any two dates – great for calculating durations for projects, events, or milestones.
Get Your Age in Multiple Time Units
Our age calculator doesn’t stop at just years or months. It breaks down your age into multiple time formats:
Years, months, and days
Only months and days
Total weeks, days, hours, minutes, and even seconds
If you’ve ever wondered, “How many days or weeks have I been alive?”—this tool gives you a precise answer.
New Feature: Reverse Age Calculator
With the latest update, you can now calculate the date of birth based on age. Just enter your age (in years, or years and months) and a reference date, and the calculator will return the possible date range of birth.
To use this feature, go to the Settings, select the “Age” input option, and click Save. The calculator will switch to accept age input instead of a birthdate.
Calculate Your Exact Age
Whether you’re checking your own age or someone else’s, this calculator gives a complete breakdown. Enter the birth date and either today’s date or any other reference date to see the result.
It also tells you how many days are left until your next birthday or special occasion, displayed right after the age results.
Track Your Baby’s Age in Weeks and Months
If you’re a new parent, you might be tracking your baby’s age in weeks or months. This calculator is perfect for that. Just enter your baby’s birth date, and the tool automatically shows their age in weeks and months.
Planning a future milestone? Change the “Find Age On” date to see how old your child will be on a specific date.
Behind the Scenes: How Age is Calculated
This calculator uses two smart approaches:
Standardized Calculation
It uses average values:1 year = 365 days
1 month = 30.4167 days (365 ÷ 12)
This method provides a general age in years, months, and days, treating leap years and different month lengths as equal for consistency.
Exact Day Count
For total days, hours, or seconds, we use a precise method that counts:Regular and leap years
Exact number of days between two dates
Partial year days
This ensures your age is calculated with maximum accuracy.
Find Out How Many Days Until a Special Date
Planning for a birthday, holiday, or event? You can use this calculator to find out how many days are left.
Simply:
Enter today’s date as the “Date of Birth”
Enter the event date as the “Find Age On” date
The calculator then shows the exact number of days until your event.
Quick Guide: Days in Each Month
To manually estimate time between dates, keep in mind:
January – 31 days
February – 28 days (29 in a leap year)
March – 31 days
April – 30 days
May – 31 days
June – 30 days
July – 31 days
August – 31 days
September – 30 days
October – 31 days
November – 30 days
December – 31 days
This helps when calculating time spans by hand, especially for events within a year.
Smart Input, Instant Results
You don’t need to format dates with leading zeros. For example, “3” is perfectly fine for March. Just make sure to use the 4-digit year format for accuracy.
The calculator starts counting from the next full day after the start date. For instance, if your dates are 03/10/2022 to 03/13/2022, it counts 3 full days—March 11, 12, and 13.
Try It Now
Use this simple yet powerful calculator to:
Find your exact age
Track your baby’s growth
Plan ahead for events
Explore how long you’ve been alive—down to the second!
📌 Frequently Asked Questions (FAQs)
❓How do I calculate my age using this tool?
Simply enter your date of birth and a target date (default is today) into the calculator. Click Calculate, and you’ll get your age in years, months, days, and more.
❓Can I use this calculator to find my age on a future or past date?
Yes! You can change the “Find Age On” field to any future or past date to know your exact age on that day.
❓Does this calculator show age in weeks and days?
Absolutely. It shows:
Total weeks
Total days
And also hours, minutes, and seconds
Perfect if you’re curious about how long you’ve been alive!
❓How do I calculate someone’s date of birth if I only know their age?
Use the reverse age calculator feature. Go to Settings, select “Age” input, and click Save. Enter the person’s age and a reference date. The tool will estimate their date of birth range.
❓Is this calculator accurate for leap years?
Yes. The tool correctly adjusts for leap years and months with different lengths, especially when calculating total days or a specific age duration.
❓Can this calculator help me find out how old my baby is?
Yes, this is perfect for parents! Just enter your baby’s birthdate, and the tool shows their age in weeks and months automatically.
❓Can I calculate how many days are left until an event?
Yes. Input today’s date as the “Date of Birth” and your event date in the “Find Age On” field. The calculator will tell you how many days remain until that event.
❓Do I need to format dates in a specific way?
No strict formatting is required. You can enter single-digit days or months (like 3 for March), but make sure to use a 4-digit year (e.g., 2000).
❓What is the starting point for age calculation?
The calculator starts counting from the next full day after your selected start date. So if you enter 05/01/2023 to 05/04/2023, it counts 3 days: May 2, 3, and 4.