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Client-side ProcessingUpdated 2026-02-11Report issue

Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.

GCD & LCM Calculator

Calculate greatest common divisor and least common multiple.

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About GCD & LCM Calculator

Calculate greatest common divisor and least common multiple. Calculate the greatest common divisor (GCD) and least common multiple (LCM) of two numbers online for free. Uses the Euclidean algorithm for fast results. Uses precise mathematical formulas with clear, formatted results. Input validation prevents errors and guides correct usage, ensuring reliable computations every time. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.

Related tools: Prime Factorization Calculator, Prime Number Checker, Fraction Calculator

How to Use GCD & LCM Calculator

  1. Fill in the required input fields with your values.
  2. Click Calculate to run the computation.
  3. View the results below the form.

Frequently Asked Questions

What is GCD & LCM Calculator?
Calculate the greatest common divisor (GCD) and least common multiple (LCM) of two numbers online for free. Uses the Euclidean algorithm for fast results.
How are calculations performed?
Calculations use precise mathematical formulas implemented in JavaScript. The underlying formulas are well-documented and validated against known reference values to ensure correctness.
Can I use decimal values?
Yes, all input fields accept decimal numbers with full floating-point precision. You can enter values with as many decimal places as you need and the tool will compute accurate results.
Are the formulas used shown?
Where applicable, the tool displays the formula or methodology used so you can verify the computation yourself. This transparency helps you understand and trust the results.
Is GCD & LCM Calculator free to use?
Yes, this calculator is completely free to use. No account or signup is needed, and all computations run locally in your browser without any restrictions.
Is my data safe when using GCD & LCM Calculator?
Absolutely. Every calculation runs locally in your browser. No input data is transmitted to any server, ensuring your numbers stay private.

Related Tools

Prime Factorization Calculator
Find all prime factors of a given number.
Prime Number Checker
Check if a number is prime and find nearby primes.
Fraction Calculator
Add, subtract, multiply, and divide fractions.