An age calculator is a computational tool or software application developed to ascertain an individual's age by considering their date of birth in relation to the current date. The primary purpose of this tool is to provide a quick and convenient means of determining the elapsed time since a person's birth in terms of years, months, and days.

The functioning of an age calculator is straightforward. Users typically input their date of birth, and the calculator processes this information in conjunction with the current date, performing the necessary calculations to establish the person's age. The result is then presented to the user, offering a precise indication of how much time has transpired since their birth.

These calculators often take into account leap years and varying month lengths, ensuring accurate calculations. Additionally, some age calculators may offer additional features, such as providing the user's age in different units (e.g., days, weeks) or allowing them to calculate the age difference between two individuals.
Age calculators find applications in various contexts, including personal use for birthdays, anniversaries, or milestone celebrations. They are also employed in professional settings, such as HR departments, where age verification may be required for employment or benefits purposes.

In summary, an age calculator simplifies the process of determining a person's age, making it a handy and efficient tool for both personal and professional use.