GCD Calculator

Use this GCD calculator to find the greatest common divisor of two or more integers. It is useful for schoolwork, fraction reduction, ratio simplification, grouping problems and fast checks when you need a shared divisor.

You can paste numbers separated by commas, spaces or line breaks. The tool converts negative values to absolute values and applies the Euclidean algorithm so you can see how the result was reached instead of only getting a final answer.

Along with the GCD itself, the page also shows the normalized list and the simplified ratio based on the common divisor. That makes it easier to verify proportions, reduce values and understand why a set of numbers can be divided evenly.