Calculators tool
Calculate Age from a Birth Date
Calculate completed years, months, and days between a birth date and a selected date.
Inputs
Results
Simple steps
How it works
- 01
Enter a birth date.
- 02
Choose an optional date to calculate age on.
- 03
Review the age in years, months, and days.
Good to know
Frequently asked questions
Can I calculate age on a past date?
Yes. Set the “As of” date to any valid date on or after the birth date.
Are leap years handled?
Calendar dates are used, including leap days and month lengths.
Does the calculator use my timezone?
It reads the entered calendar date and calculates date parts without sending them online.
What if the birth date is in the future?
The calculator asks for a birth date that is not after the selected “As of” date.
Is this an official age record?
No. Use official records for legal or administrative age verification.