AscendLab

Math helpers

GCD/LCM 计算器

Free browser tool

GCD and LCM Calculator

Find the greatest common divisor and least common multiple for a list of integers in your browser.

Integer list
Paste integers separated by commas, spaces, semicolons, or line breaks.
GCD and LCM
3 integers detected.

Greatest common divisor

6

Least common multiple

180

Quick answer

GCD finds the largest shared divisor across a list of integers.

LCM finds the smallest shared multiple across the same list.

Best inputs

Use integers

Whole numbers are required for divisor and multiple calculations.

Paste lists freely

Commas, spaces, semicolons, and new lines are accepted.

GCD and LCM method
The calculator reduces the list pair by pair.
GCD uses the Euclidean algorithm.
LCM uses absolute(a x b) / GCD(a, b).
The operation is repeated across all entered integers.
Example, Assumption, and Limitation
Use the result as a practical estimate or transformation, then confirm edge cases for critical work.

Example

12, 18, and 30 have GCD 6 and LCM 180.

Assumption

Inputs are intended as integer values.

Limitation

Very large lists or huge integers can become harder to read and verify manually.

Common use cases
These pages are built for lightweight browser-side work, examples, and planning.

Fractions

Simplify fractions and common denominators.

Scheduling

Find when repeating cycles align.

Classroom math

Check GCD and LCM exercises.

Ratios

Find common factors for simplification.

Frequently asked questions

What is GCD?

GCD means greatest common divisor, the largest integer that divides all entered numbers.

What is LCM?

LCM means least common multiple, the smallest positive integer that is a multiple of all entered numbers.

Can I enter more than two numbers?

Yes. Paste any list of integers separated by commas, spaces, semicolons, or lines.

Does this handle decimals?

No. This tool is for integers.

Suggested workflow

Common factor workflow

Find divisors, reduce fractions, then simplify ratios.

Step 1
Find GCD and LCM
Calculate shared divisors and multiples.
Open tool
Step 2
Calculate fractions
Reduce fraction results.
Open tool
Step 3
Simplify ratios
Reduce two-part ratios.
Open tool