A birthday calculator is a tool that helps individuals determine various aspects related to their birth date. It can calculate age in years, months, and days, as well as provide information about zodiac signs and birthstones. Some calculators also offer insights into significant life events based on the birth date. These calculators are often available online and can be used for fun or practical purposes. For example, they can help plan birthday celebrations or understand astrological traits. Overall, birthday calculators are simple yet useful tools for anyone curious about their birth date and its significance.