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LCM & GCD Calculator — Any List of Numbers

Greatest common divisor and least common multiple of any list of integers, exact. Client-side.

Free No signup Client-side Privacy friendly Updated

How to use

  1. 1 Enter two or more integers, separated by commas or spaces.
  2. 2 The GCD and LCM are computed instantly.
  3. 3 Large results are exact (arbitrary precision).

Why use this tool

  • GCD and LCM of any list of numbers in one step.
  • Exact results even for very large numbers.
  • Runs entirely in your browser.

Frequently asked questions

What is the GCD?

The greatest common divisor — the largest integer that divides all the given numbers without a remainder.

What is the LCM?

The least common multiple — the smallest positive integer that is a multiple of all the given numbers.

How are they related?

For two numbers, gcd(a, b) × lcm(a, b) = |a × b|. The GCD is found with the Euclidean algorithm; the LCM follows from it.

Can I enter more than two numbers?

Yes — the GCD and LCM are computed across the whole list pairwise.

What is LCM & GCD Calculator?

An LCM/GCD calculator finds the greatest common divisor and least common multiple of a list of integers using the Euclidean algorithm, with exact arbitrary-precision arithmetic.

Features

GCD & LCM together

Computes both the greatest common divisor and least common multiple at once.

Euclidean algorithm

Uses the classic, efficient Euclidean method — exact for large integers.

Free & private

Runs on your device — nothing is uploaded.

Example

Input

12 and 18

Output

GCD = 6 · LCM = 36

Common use cases

  1. 1

    Simplify fractions

    Divide numerator and denominator by their GCD to reduce a fraction.

  2. 2

    Find common denominators

    Use the LCM of denominators to add or compare fractions.

  3. 3

    Schedule cycles

    Find when two repeating events coincide via their LCM.

Summary

Zerethon's LCM & GCD calculator finds the greatest common divisor and least common multiple of two or more integers in your browser, using the Euclidean algorithm. It shows both results live. Everything runs client-side — nothing is uploaded.

Category
Math
Pricing
Free
Privacy
Browser-based
Signup
Not required

References

Privacy

Your data never leaves your browser unless explicitly stated. LCM & GCD Calculator runs entirely client-side — no server upload, no logging, no tracking of your input.

Compare

LCM vs GCD

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