What is an Age Calculator?
An age calculator helps you measure the exact time between a date of birth and a target date, usually today. It can show age in years, months, days, and total days lived.
Date & Time
Age Calculator
Use this age calculator to find exact age from date of birth in years, months, and days instantly.
Enter Date of Birth
Pick a birth date to calculate age instantly.
Calculations are based on the Gregorian calendar and use your local date for accurate age results.
Ready to calculate
Select a date of birth to view an exact age breakdown in years, months, days, and more.
Age Calculation Logic
Basic Age
Age = Current Date − Date of Birth
Years
Subtract birth year from current year, then adjust if birthday has not occurred yet this year
Detailed Age
Break the date difference into years, months, and days
Examples
Born on Jan 1, 2000
Input: Date of Birth = Jan 1, 2000
Result: Age shown as years, months, and days up to today
Chronological Age vs Completed Age
Chronological age is the exact time elapsed since birth. Completed age usually refers to the number of full years already completed.
Frequently Asked Questions
Subtract the birth date from the current date, then break the result into years, months, and days.
Yes. Most age calculators can display exact age in years, months, and days.
Chronological age is the exact amount of time a person has lived since birth.
Explore Similar Calculators
Browse related calculator variations and find the version that matches your preferred units or use case.
Date of Birth Age Calculator
Find exact age using date of birth.
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Chronological Age Calculator
Measure exact chronological age from birth to a selected date.
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Age in Months Calculator
Convert age into total completed months.
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Age in Days Calculator
Find total days lived from birth date.
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