🎯 Final Grade Calculator

Compute n! (factorial), n!! (double factorial), and !n (subfactorial) with BigInt precision, digit counts, and trailing-zero analysis.

Compute the nth Fibonacci number, generate the first n terms, or check whether a number is Fibonacci. BigInt precision with golden-ratio convergence analysis.

Free online fraction calculator supporting arbitrary-operand add/sub/mul/div with integer powers. Natively parses mixed numbers, repeating decimals (0.(3)), percents, and Unicode fraction characters (½ ¼ ⅓). BigInt exact arithmetic with auto-reduce, simultaneous display of improper/mixed/repeating-decimal/percent/LaTeX forms, and step-by-step LCM/combine/GCD explanation plus pie-chart and number-line visuals.

Calculate GCD and LCM for multiple integers with Extended Euclidean Algorithm and Bézout's identity. Shows step-by-step Euclidean and prime factorization methods.

All-in-one geometry calculator for 25 common 2D shapes and 3D solids — area, perimeter, volume, surface area. Reverse-solve from any known value, with parameter-responsive SVG diagrams, substituted formula steps, per-field unit conversion, and adjustable significant figures / π precision.