What it does and when to use it
The calculator returns exact age in completed years, months, and days.
Use it for forms, eligibility dates, insurance, or event planning.
How to Calculate Exact Age?
At a glance
What to enter
Enter the birth date and the date on which age should be measured.
How to read the result
The result separates completed years from the remaining months and days.
Calculating exact age isn't as simple as it seems — leap years, varying month lengths, and timezone differences all matter.
Simple Method
Age in years = Current year − Birth year
(subtract 1 if birthday hasn't occurred yet this year)
Exact Age
For precise age in years, months and days:
- Calculate complete years since birth
- Calculate months since last birthday
- Calculate days since start of current month period
Example
Born: March 15, 1990 | Today: June 27, 2026
Years: 36 (birthday already passed this year)
Months: 3 (April, May, June)
Days: 12
Exact age: 36 years, 3 months and 12 days
Common mistakes
- Subtracting calendar years without checking whether the birthday passed.
- Entering dates in the wrong order or mixing time zones.
Frequently asked questions
Are leap years included?
Yes. Full date arithmetic accounts for month lengths and leap years.
Why is it different from year subtraction?
A completed year is added only on the birthday.
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