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GCD & LCM Calculator

Find the greatest common divisor and least common multiple.

Runs locally · nothing uploaded

How to use this tool

  1. 1Enter your numbers into the fields.
  2. 2Read the calculated result immediately below.
  3. 3Adjust any number to see the result update live.

Frequently asked questions

Are these calculators exact?
Yes, for standard arithmetic they return exact results; results involving irrational numbers or very large factorials are shown rounded or as approximations where noted.
Is there a limit on input size?
Extremely large numbers (in the trillions or beyond) may lose precision, since calculations run in your browser's native number handling.

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