GCF and LCM Calculator
Find the greatest common factor (GCF/GCD) and least common multiple (LCM) of a list of whole numbers.
Enter your values and press Calculate.
How to use the GCF and LCM calculator
The LCM is the lowest common denominator when adding fractions.
Formula
GCF uses Euclid’s algorithm; LCM(a, b) = a × b ÷ GCF(a, b), applied pairwise.
More maths calculators
Online CalculatorA simple calculator — type any sum.Percentage CalculatorPercent of a number, percent of total and percent change.Fraction CalculatorAdd, subtract, multiply and divide fractions.Average CalculatorMean, median, mode, range and standard deviation.Quadratic Equation SolverSolve ax² + bx + c = 0, including complex roots.Pythagorean Theorem CalculatorHypotenuse and angles of a right triangle.Circle CalculatorArea, circumference and diameter of a circle.Random Number GeneratorRandom whole numbers in any range.Perimeter CalculatorPerimeter of rectangles, circles and triangles.Test Score CalculatorPercentage and grade from marks scored.Long Division CalculatorQuotient and remainder with decimal answer.Percentage Difference CalculatorPercent difference between two values.Percent Error CalculatorPercent error between measured and true values.Ratio CalculatorSimplify ratios and solve A:B = C:D.Prime Factorization CalculatorPrime factors and whether a number is prime.Scientific Notation ConverterConvert numbers to and from scientific notation.Exponent CalculatorRaise a number to any power.Square Root & Nth Root CalculatorSquare, cube and nth roots.Logarithm CalculatorLog base 10, natural log and any base.Rounding CalculatorRound to decimals, tens, hundreds or significant figures.Decimal to Fraction CalculatorConvert decimals to simplified fractions.Slope CalculatorSlope, line equation and distance from two points.Triangle CalculatorAngles, area and perimeter from three sides.Trigonometry CalculatorSin, cos, tan and their inverses.Area CalculatorArea of rectangles, triangles, circles and more.Volume CalculatorVolume of cubes, cylinders, spheres, cones and more.Surface Area CalculatorSurface area of 3D shapes.Regular Polygon CalculatorArea, angles and radius of a regular polygon.Arc Length CalculatorArc length, chord and sector area.Degrees Minutes Seconds ConverterConvert DMS to decimal degrees and back.Weighted Grade CalculatorCourse grade from weighted assignments.Final Exam Grade CalculatorScore needed on the final to hit a target.GPA CalculatorGrade point average from letter grades and credits.Binary, Hex & Number Base ConverterConvert between binary, octal, decimal and hex.Roman Numeral ConverterConvert numbers to Roman numerals and back.Z-Score CalculatorZ-score and percentile from mean and SD.Permutation & Combination CalculatornPr, nCr and factorials.