Compute GCD/LCM for 2–5 numbers with steps.. GCD & LCM Calculator is a free online tool from the ToolsRift Math Calculators collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
Enter 2 to 5 whole numbers separated by commas and the calculator returns the GCD, the LCM and each intermediate step.
GCD is the largest number that divides all inputs; LCM is the smallest number they all divide into.
The GCD uses the Euclidean algorithm; the LCM uses the identity LCM(a,b) = |a×b| / GCD(a,b), applied across all numbers.
Between 2 and 5 numbers, separated by commas or spaces.