How does the age calculator work?

It uses PHP's DateTime difference function to compute the precise number of years, months, and days between your birth date and today (or a custom date).

Can I calculate age between two specific dates?

Yes. Enter your birth date and set a custom "Calculate to" date to find the age at any point in time.

How accurate is the hour and minute count?

The calculation is based on midnight-to-midnight days, so the hour and minute counts reflect full calendar days elapsed, not the exact time of birth.

How is the zodiac sign determined?

The zodiac sign is determined by the month and day of birth according to the standard Western astrological calendar (e.g., Aries: March 21 – April 19).

What if I enter a future end date?

The calculator accepts any valid date as the end date, including future dates, and calculates the age at that future point.

Age Calculator

Name: Age Calculator
Availability: InStock
Author: Nham Vu

Enter your date of birth to instantly see your exact age, total days and hours lived, next birthday countdown, and zodiac sign.

Enter Details

Results

Enter your date of birth and click Calculate Age.

Summary

Enter your date of birth to instantly see your exact age, total days and hours lived, next birthday countdown, and zodiac sign.

How it works

Enter your date of birth.
Optionally enter a custom end date (defaults to today).
Click "Calculate Age" to see your exact age.
View the stats panel for total days, hours, minutes, and your next birthday.

Use cases

Calculate exact age for official documents or applications.
Find out how many days until your next birthday.
Calculate the age between two historical dates.
Discover your zodiac sign.

Frequently Asked Questions

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Last updated: 2026-06-03 · Reviewed by Nham Vu