Matemática e Estatísticas

Calculadora de álgebra gratuita — resolva equações lineares e quadráticas, simplifique expressões, fatorize polinômios, expanda expressões e resolva sistemas de equações 2x2 com soluções passo a passo.

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Free Area Calculator supporting 19 shapes — Square, Rectangle, Triangle (6 methods), Circle, Ellipse, Sector, Trapezoid, Parallelogram, Rhombus, Kite, Regular Polygon, Pentagon, Hexagon, Octagon, Annulus, Semicircle, Circle Segment, Rectangular Border, and Irregular Quadrilateral. Instant results with formula display, perimeter, and unit conversions.

Calculadora de Média Gratuita — calcule a média aritmética, mediana, moda, intervalo, desvio padrão, média geométrica, média harmônica e mais a partir de qualquer conjunto de números. Suporta modos de média simples e ponderada.

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Free Confusion Matrix Calculator — compute accuracy, precision, recall, F1 score, MCC, Cohen's Kappa, specificity, and 15+ classification metrics from TP, FP, TN, FN inputs. Supports binary and multi-class modes.

Free Statistical Process Control (SPC) Control Chart Calculator — supports I-MR, X-bar R, X-bar S, P, NP, C, and U charts with UCL, LCL, Nelson run rule detection, and process capability (Cp, Cpk).

Free Process Capability Index (Cpk, Cp, Pp, Ppk) calculator for manufacturing and quality control. Calculate capability indices from summary statistics or raw data, with DPMO, sigma level, and yield outputs.

Free Derivative Calculator with step-by-step solutions. Compute first, second, and higher-order derivatives of polynomials, trigonometric, exponential, logarithmic, and composite functions instantly.

Free Equation Solver — solve linear, quadratic, and systems of equations step-by-step with discriminant analysis, factored forms, and verification checks.

Free F1 Score Calculator — compute F1 score, precision, recall, accuracy, specificity, MCC, and more from a confusion matrix or direct precision/recall inputs. Supports F-beta, macro/micro/weighted averaging for multi-class models.

Free Greatest Common Factor (GCF) calculator — also known as GCD or HCF. Find the GCF of 2 to 10 numbers instantly with step-by-step solutions using Euclidean algorithm, prime factorization, or listing factors.

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Free Integral Calculator — compute indefinite and definite integrals with step-by-step solutions, Riemann sum approximations, and interactive area-under-curve charts for polynomials, trigonometric, exponential, and logarithmic functions.

Free Least Common Multiple (LCM) Calculator — find the LCM of 2 to 10 integers instantly with step-by-step solutions using prime factorization, GCF method, or listing multiples.

Free Logarithm (Log) Calculator — compute log base 10, natural log (ln), binary log (log2), antilog, change of base, and solve for any logarithm variable with step-by-step solutions and real-world examples.

Free Logarithm Calculator — compute log, antilog, natural log, binary log, and custom-base logarithms. Solve log equations, generate log tables, and explore scientific applications like pH, decibels, Richter scale, and doubling time.

Free online Matrix Calculator for addition, subtraction, multiplication, determinant, inverse, transpose, eigenvalues, RREF, LU decomposition, and linear system solving — all computed instantly in your browser.

Free Matrix Multiplication Calculator — multiply two or more matrices step by step, with color-coded dot product breakdowns, heatmap visualization, and LaTeX/CSV export. Supports A×B, A^n, scalar multiplication, and chained A×B×C.

Free medical test probability calculator using Bayes' theorem — compute post-test probability, PPV, NPV, likelihood ratios, and more from sensitivity, specificity, and prevalence.

Free Online Calculator with basic and scientific modes — perform arithmetic, trigonometry, logarithms, memory functions, and more directly in your browser.