Calculate GCF

Find the greatest common factor and least common multiple.

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First integer

Second integer

Answer

…

Euclid’s algorithm repeatedly replaces a pair with the smaller value and the remainder. LCM = absolute product ÷ GCF.

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Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Saved scenario

Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

Negative signs are ignored for factors and multiples. At least one input must be nonzero. Inputs are limited to exact safe integers within ±1e15.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Calculate GCF

Euclid’s algorithm repeatedly replaces a pair with the smaller value and the remainder. LCM = absolute product ÷ GCF.

Negative signs are ignored for factors and multiples. At least one input must be nonzero. Inputs are limited to exact safe integers within ±1e15.

Next: Permutation combination calculator

A worked example

With first integer = 24, second integer = 36, the greatest common factor is 12.

Next: Prime factorization calculator

Before you use the result

Negative signs are ignored for factors and multiples. At least one input must be nonzero. Inputs are limited to exact safe integers within ±1e15.

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ToolOctopus. “Calculate GCF.” Updated 2026-09-26. https://tooloctopus.com/gcf-calculator.

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