Age Calculator

Age

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Guide to the Age Calculator

This calculator helps you with age-related calculations. It offers two modes: Age — find your exact age between two dates in years, months, and days; Date of Birth — reverse-calculate a birth date from a known age.

How to Use the Calculator

  1. Pick Your Mode: Start by selecting either Age to find your age from a birth date, or Date of Birth to reverse-calculate a birth date.
  2. Age Mode: Enter a 'Date of Birth' and the date you want to calculate age at (defaults to today), then click Calculate to see your exact age in years, months, and days.
  3. Date of Birth Mode: Enter an age in years, months, and days, plus the date when that age applies. Click Calculate to find the corresponding birth date.

Reading Your Results

What you'll see depends on which mode you're using:

  • Age: Your calculated age broken down into years, months, and days, plus the total number of days and weeks for quick reference.
  • Date of Birth: The calculated birth date based on the age you provided.