Math
Triangle & Pythagorean CalculatorSides, angles and area of any triangle, plus Pythagoras.Volume CalculatorVolume of cubes, cylinders, spheres, cones and pyramids in litres.Area CalculatorArea and perimeter of squares, rectangles, triangles, circles and more.Probability CalculatorPermutations, combinations, two-event and binomial probability.Mean, Median & Standard Deviation CalculatorDescriptive statistics: mean, median, mode, variance and more.LCM & GCD CalculatorGreatest common divisor, least common multiple and factorisation.Quadratic Equation SolverSolve ax² + bx + c = 0 with the discriminant, steps and vertex.Square Root CalculatorSquare, cube and nth roots, with simplified radicals.Fraction CalculatorAdd, subtract, multiply and divide fractions with steps.Rule of Three CalculatorFind the unknown in a direct or inverse proportion.Percentage Change CalculatorPercentage increase or decrease between two numbers.Percentage CalculatorPercent of a number, percentage change, and adding or removing a percentage.