Age Calculator | Calculate Age in Years, Months, Days

📖 How to Use This Age Calculator

Enter birth date - Input your birth day, month, and year.

Select as of date (optional) - Leave empty to use today's date, or enter a custom date.

Click "Calculate Age" - Get your exact age in years, months, days, total days, and next birthday countdown.

🎂 How Age is Calculated

Age calculation subtracts the birth date from the target ("as of") date. The calculation accounts for leap years and varying month lengths. Our calculator provides your exact age in years, months, and days - not just rounded years.

📊 Key Calculations Provided

Exact Age: Years, months, and days
Total Days: Total number of days alive
Total Months: Total months since birth
Total Weeks: Full weeks plus remaining days
Day of Birth: Which day of the week you were born
Next Birthday: Date and days remaining

❓ Frequently Asked Questions (FAQ)

How is age calculated on a birthday?

Your age increases by 1 year exactly on your birthday. For example, born March 15, 1990 → turns exactly 35 on March 15, 2025.

How does the calculator handle leap years?

The calculator accounts for leap years (February 29) in all calculations automatically.

Can I calculate age for a past date?

Yes! Use the "As of Date" field to enter any past date (e.g., graduation day, wedding day).

How accurate is the age calculation?

100% accurate for calendar-based age calculation. Accounts for all calendar rules including leap years and month lengths.