Everyday utility

Greatest Common Factor Calculator

Find the Greatest Common Factor (GCF), also called GCD, of two or more integers — the largest number that divides them all. Use this Data and utilities tool to enter your numbers, review the result, and understand the key assumptions before making the next decision.

What you get
A focused calculator, clear explanation, common questions, and useful next tools.
Quick intro
Calculator
Result
Explanation
Common questions
Related tools

Calculator tool

How this calculator works
The result depends on the numbers you enter and the assumptions shown below.

The GCF (or GCD) is found using the Euclidean algorithm: repeatedly divide the larger number by the smaller and take the remainder until the remainder is 0. The last non-zero remainder is the GCF.

Review the inputs carefully and treat the output as an estimate. For decisions involving money, taxes, health, law, or security, compare the result with trusted professional guidance when needed.

Frequently asked questions

What is the difference between GCF and LCM?

GCF is the largest number dividing all given numbers. LCM is the smallest number divisible by all given numbers. GCF × LCM = product of the two numbers.