How to use the gcd and lcm calculator
Find the greatest common divisor and least common multiple. Enter number a, number b in the fields above; the gcd, lcm are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “hcf”, “common factor”, “least common multiple”, “calculate gcd and lcm”, “find gcd”.
Formula
Variables
- a — Number a
- b — Number b
Worked example
With number a = 48, number b = 180, the calculator gives gcd ≈ 12; lcm ≈ 720.
Frequently asked questions
What is the gcd and lcm calculator used for?
Find the greatest common divisor and least common multiple. It helps with questions such as “hcf”, “common factor”, “least common multiple”.
What is the formula for the gcd and lcm calculation?
GCD = gcd(a,b). LCM = lcm(a,b). Here a is number a, b is number b.
What inputs do I need for the gcd and lcm calculator?
You need number a, number b. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the gcd and lcm calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the gcd and lcm result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.