Use this free age calculator to calculate your age in years, months,
and days based on your date of birth.
How the Age Calculator Works
The calculator compares your date of birth with the date on which you
want your age calculated. It then determines the completed years,
months, and days between the two dates.
What Can You Use It For?
You can use the age calculator to determine a person's current age or
their age on a specific past or future date. It can be useful for
birthdays, forms, records, planning, and other everyday calculations.
Why Age Is More Than a Year Difference
Simply subtracting birth years may give an incorrect result if the
birthday has not yet occurred in the year being examined. This
calculator takes the month and day into account.
Example
Someone born on January 15, 2000 will not turn 27 until January 15,
2027. Before that date, the person's completed age remains 26 years.
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Understanding Age Calculations
An age calculator determines the time elapsed
between a person's date of birth and a selected
reference date. Age can be expressed in completed
years, months, weeks, or days.
How Is Age Calculated?
To calculate age in completed years, subtract
the birth year from the reference year.
If the birthday has not yet occurred in the
reference year, subtract one additional year.
Worked Age Calculation Example
Suppose a person was born on June 15, 1990,
and the reference date is November 3, 2026.
Their age is 36 completed years because
their birthday has already occurred in 2026.
Why Age Calculations Can Differ
Calendar months have different lengths,
and leap years contain an additional day.
For this reason, calculating age in calendar
years and months differs from simply dividing
the number of elapsed days by 365.
Common Uses of an Age Calculator
- Determining age from a date of birth
- Calculating age on a future or past date
- Planning birthdays and anniversaries
- Checking age-related eligibility dates
- Understanding elapsed calendar time
Frequently Asked Questions
Does age increase on January 1?
No. Under the usual completed-years method,
age increases on the person's birthday,
not at the beginning of each calendar year.
How are leap-year birthdays handled?
People born on February 29 have a birthday
date that occurs only in leap years.
Legal age recognition on February 28 or
March 1 in other years may depend on
applicable laws and jurisdiction.
Can I calculate age on a past date?
Yes, if the calculator supports a reference
date. Enter the date of birth and the
selected past date to determine the age
at that time.
Is age in months the same as age in days
divided by 30?
No. Calendar months range from 28 to 31 days.
Accurate calendar-month calculations account
for the actual dates involved.
This information is for general educational
purposes. Legal eligibility may depend on
jurisdiction-specific rules.