The Highest Common Factor (HCF) Calculator, also known as the Greatest Common Divisor (GCD) Calculator, is a simple online tool that helps you quickly find the largest positive integer that divides two or more numbers without leaving a remainder. Just enter whole numbers separated by commas, and the calculator will instantly show the HCF along with the list of all common factors. This tool is especially useful for students, teachers, and anyone working with fractions, ratios, or number theory. By using the HCF calculator, you can easily simplify fractions, solve math problems, and understand the relationship between numbers in a clear and efficient way.