Skip to content
FreeToolsNets

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.

More Math & Numbers tools

See all →
Math & Numbers

Percentage Calculator

Calculate percentages, increases and decreases.

 Math & Numbers

Ratio Calculator

Simplify a ratio or scale it to a new value.

 Math & Numbers

Average Calculator

Calculate the average of a list of numbers.

 Math & Numbers

Prime Number Checker

Check whether a number is prime and see its factors.

Related tools

Age Calculator Percentage Calculator Margin Calculator Prime Number Checker Average Calculator CPM Calculator