Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Greatest Common Factor Calculator

Find the greatest common factor (GCF) — also called the greatest common divisor (GCD) — of two integers using the Euclidean algorithm. The largest number that divides both inputs evenly; used everywhere from simplifying fractions to designing tilings to cryptography.

First Number

Second Number

Fill in the required fields to see your result.

Math

Fraction Simplifier

Reduce any fraction to its lowest terms instantly by finding the greatest common divisor. Use it when adding fractions, checking equivalence, or simplifying homework answers.

Numerator

Denominator

Fill in the required fields to see your result.

Key differences

	Greatest Common Factor Calculator	Fraction Simplifier
Category	Math	Math
Inputs required	2	2
Result	Greatest Common Factor	Decimal Value
What it does	Find the greatest common factor (GCF) — also called the greatest common divisor (GCD) — of two integers using the Euclidean algorithm. The largest number that divides both inputs evenly; used everywhere from simplifying fractions to designing tilings to cryptography.	Reduce any fraction to its lowest terms instantly by finding the greatest common divisor. Use it when adding fractions, checking equivalence, or simplifying homework answers.