Age Calculator
Calculate exact age and time since birth
Last updated: January 2025
About This Tool
An age calculator precisely determines your age in years, months, and days from your date of birth. Beyond simple age calculation, it provides interesting statistics about your life including total days lived, upcoming birthday countdown, and zodiac information.
What is Age Calculator?
Age is the length of time that a person has lived, typically measured from their date of birth. An age calculator computes this duration with precision, accounting for leap years and varying month lengths. It can calculate age as of today or any specific date, useful for legal documents, milestone tracking, or historical research.
How It Works
The calculator subtracts the birth date from the target date, carefully handling month and year boundaries. It accounts for leap years (years divisible by 4, except century years unless divisible by 400) and months with different numbers of days. The result is expressed in years, months, and days.
Formula
Age = Target Date - Birth Date (accounting for calendar variations)
Your Age
years
months
days
13,168
Total Days
1,881
Total Weeks
432
Total Months
316,032
Total Hours
Next Birthday
Fun Facts
Time Lived
18,961,920
Minutes
1,137,715,200
Seconds
36
Leap Years Lived
39,504
Meals Eaten (~)
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When to Use This Calculator
- 1Determining exact age for legal documents or applications
- 2Calculating age requirements for services, programs, or benefits
- 3Planning milestone birthdays and celebrations
- 4Verifying age eligibility for contests or promotions
- 5Historical research to calculate ages at specific events
Pro Tips
- •Remember that "age in years" typically means completed years (floor value)
- •For precise legal age, time of day may matter (born before/after midnight)
- •Account for timezone differences when calculating age across regions
- •Leap year babies (Feb 29) celebrate on Feb 28 or Mar 1 in non-leap years
- •Some cultures calculate age differently (Korean age starts at 1)
Common Mistakes to Avoid
- •Forgetting to account for whether the birthday has occurred this year
- •Not considering leap years in precise calculations
- •Confusing chronological age with developmental or biological age
- •Assuming all months have 30 days for rough calculations
- •Not specifying the reference date (today vs. specific date)