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Date & Time

Age Calculator

Get your exact age in years, months, and days from your date of birth. Also shows next birthday, days until, weekday of birth, and totals in months, weeks, and days. All calculations run locally in your browser.

Exact Age Calculator
Client-side onlyFast & private
Date of Birth

Uses your local timezone for all calculations.

As of

Live current date/time

Options

Show totals in hours/min/sec

Notes

For Feb 29 birthdays, the next birthday in non-leap years is taken as Feb 28.

Results

Date only • As of now
Summary
  • DOB: Mon, Jan 1, 1990 (Monday)
  • As of: Tue, Sep 23, 2025 10:56 PM (now)
  • Age: 35 years, 8 months, 22 days
  • Next birthday: Thu, Jan 1, 2026 (Thursday)
  • Days until next birthday: 100
Totals
  • Months lived: 428
  • Weeks lived: 1,864
  • Days lived: 13,049

How to Use the Age Calculator

This free, client-side Age Calculator gives your exact years, months, and days from your date of birth. Optionally include time to show totals in hours, minutes, and seconds. Nothing is uploaded or stored.

  1. Enter your date of birth: Pick the calendar date (and time, if you want a time-of-day precise total).
  2. Choose “As of”: Leave Use now on for the current moment, or set a custom as-of date (and time).
  3. Review results: See your age broken down into years, months, days, plus your next birthday, days until, and birth weekday.
  4. Totals: View total months, weeks, days, and (if enabled) hours, minutes, and seconds lived.
  5. Copy or reset: Use Copy for a shareable summary or Reset to start over.

What’s included

  • Exact age (years, months, days)
  • Next birthday date & weekday
  • Days until next birthday
  • Totals in months, weeks, days (and hours/min/sec if enabled)

Accuracy Notes

  • Calculations use your browser’s local timezone.
  • Feb 29 birthdays map to Feb 28 in non-leap years for “next birthday.”
  • “Days lived” is computed from calendar midnights to avoid DST drift.

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