How do I calculate my exact age?

Enter your date of birth in the Age Calculator above and click Calculate. The tool gives your exact age in years, months, days, hours, and even minutes.

How do I calculate age difference between two people?

Use the Age Difference tab. Enter both birth dates and the calculator shows the exact difference in years, months, and days.

How is age calculated when born on Feb 29?

People born on February 29 (leap day) celebrate their birthday on March 1 in non-leap years. The age calculator handles this automatically.

What is the most common age calculation method?

The most common method adds a year on your birthday each year. So if you were born on June 15, 2000, you turn 25 on June 15, 2025. This is the international standard used in most countries.

Age Calculator – How Old Am I? Calculate Exact Age

How to Calculate Your Age

Age calculation seems simple — subtract your birth year from the current year — but it's more complex than that. Your exact age depends on whether your birthday has passed yet this year. If today is March 15, 2025 and you were born on December 1, 2000, you are 24 years old (not 25), because your birthday hasn't happened yet in 2025.

The formula: Age = Current Year − Birth Year, then subtract 1 if your birthday hasn't occurred yet this year. Our age calculator handles all edge cases including leap year birthdays.

Age in Different Measurements

Age	In Days	In Weeks	In Months	In Hours
1 year	365 days	52 weeks	12 months	8,760 hours
18 years	6,570 days	939 weeks	216 months	157,680 hours
25 years	9,131 days	1,304 weeks	300 months	219,145 hours
30 years	10,958 days	1,565 weeks	360 months	262,980 hours
40 years	14,610 days	2,087 weeks	480 months	350,640 hours
50 years	18,263 days	2,609 weeks	600 months	438,291 hours

Frequently Asked Questions

How old am I if I was born in 2000?

Use the calculator above with your exact birth date for a precise answer.

How many days old am I?

The Age Calculator shows your total days lived. Enter your birth date above and the "Total Days" field shows the exact count including leap years.

How is age calculated in different countries?

Most countries use the international standard: age increases on your birthday each year. South Korea traditionally uses a different system (everyone is 1 at birth and ages increase on New Year's Day), though South Korea officially switched to the international system in 2023.

Also useful: Date Calculator for days from today and Loan Calculator for financial planning.