Matemática
Porcentagens, frações, geometria e estatística.
Calculators (36)
Calculadora de Juros Compostos
Simule o crescimento patrimonial no longo prazo com aportes recorrentes e desconto da inflação real.
Calculadora de Porcentagem
Calcule aumentos, descontos, proporções e variações percentuais instantaneamente.
Calculadora de Frações
Some, subtraia, multiplique e divida frações próprias, impróprias e números mistos com passo a passo.
Equação de Segundo Grau (Bhaskara)
Resolva ax² + bx + c = 0 com a fórmula de Bhaskara, discriminante e raízes reais ou complexas.
Calculadora Científica
Avalie funções trigonométricas, logarítmicas, exponenciais e fatoriais com precisão.
Calculadora Estatística
Calcule média, mediana, moda, variância, desvio padrão e quartis para conjuntos de dados.
Calculadora de Probabilidade
Calcule permutações nPr, combinações nCr, distribuições binomiais e probabilidade condicional.
Calculadora de Coeficiente de Rendimento (GPA)
Calcule a média acadêmica ponderada por créditos de disciplinas na escala 4.0 ou decimal.
Calculadora de Proporções e Razão
Resolva proporções A:B = C:D, simplifique frações de razão e redimensione escalas.
Calculadora de Matrizes
Execute soma, multiplicação matricial, determinante, matriz inversa e transposta para 2x2 e 3x3.
Calculadora de Triângulos
Resolva triângulos pela lei dos senos, cossenos e Pitágoras, obtendo lados, ângulos e área.
Law of Sines Calculator
Solve oblique triangles with the Sine Rule across AAS, ASA, and the SSA ambiguous case.
Greatest Common Factor Calculator
Find the Greatest Common Factor (GCF / GCD) and Least Common Multiple (LCM) with step-by-step Euclidean division and prime trees.
Exponent Calculator
Calculate powers, negative exponents, fractional roots, and complex numbers with step-by-step exponent laws.
Coefficient of Variation Calculator
Calculate the Coefficient of Variation (CV / RSD) to compare relative dispersion and risk across different scales.
A/B Test Significance Calculator
Evaluate whether conversion differences between control and variant are statistically significant using two-proportion z-tests.
Binomial Distribution Calculator
Compute exact PMF and cumulative CDF binomial probabilities, distribution moments, and discrete histogram projections.
Calculadora de CAGR
Calcule a Taxa de Crescimento Anual Composta (CAGR), ganhos totais e horizonte de duplicação patrimonial.
Calculadora de Valor Futuro
Calcule o montante acumulado futuro combinando capital inicial e depósitos periódicos corrigidos por juros.
Calculadora de Crescimento Populacional
Modele a expansão exponencial malthusiana e o crescimento logístico de Verhulst com capacidade de suporte ambiental.
Calculadora de Área de Círculo
Calcule a área do círculo, diâmetro, circunferência, raio e setor circular.
Calculadora Binária e Conversor de Base
Execute aritmética binária, octal, decimal e hexadecimal com complemento de dois.
Calculadora da Fórmula da Distância
Calcule distâncias euclidianas 2D e 3D, radicais, ponto médio e métrica de Manhattan.
Calculadora de Fatoração Prima
Decomponha números compostos em fatores primos, divisores, função totiente e somas alíquotas.
Calculadora da Lei dos Cossenos
Resolva triângulos oblíquos SAS e SSS, ângulos, perímetro e área pela fórmula de Heron.
Calculadora do Mínimo Múltiplo Comum (MMC)
Calcule o mínimo múltiplo comum e o máximo divisor comum entre múltiplos inteiros.
Calculadora de Logaritmo
Calcule logaritmos naturais (ln), comuns (log10), binários (log2) e de base personalizada.
Calculadora de Porcentagem de Erro
Determine a discrepância experimental, erro relativo e diferença percentual.
Calculadora de Declive e Inclinação
Calcule a inclinação linear, ângulo de inclinação, porcentagem e retas perpendiculares.
Gerador de Boxplot
Gere o resumo de cinco números de Tukey e detecte valores discrepantes (outliers).
Calculadora do Teste Qui-Quadrado
Avalie a independência de tabelas de contingência, aderência, valores-p e V de Cramér.
Calculadora de Intervalo de Confiança
Calcule intervalos de confiança para médias e proporções com margem de erro.
Calculadora do Coeficiente de Correlação de Pearson
Avalie a correlação linear bivariada (r), R², significância do teste t e regressão MQO.
Calculadora de Amplitude Interquartil (IQR)
Determine a dispersão não paramétrica, quartis Q1/Q3 e limites de outliers de Tukey.
Calculadora de Tamanho de Amostra
Determine o tamanho de amostra necessário, margem de erro e correção para população finita.
Calculadora de Escore Z
Converta pontuações brutas em escores Z padronizados, percentis normais e escalas psicométricas.
Guias (32)
Percentage Calculations in Practice: Relative Change, Deltas & Reversals
Master the 5 percentage formulas, mental math hacks, sales tax back-outs, percentage changes, and asymmetric loss recovery.
Fraction Arithmetic: Common Denominators, Mixed Numbers & Simplification
Euclidean algorithm GCD reduction, least common denominator (LCD) methods, mixed number conversions, and fraction division.
Trigonometric & Transcendental Functions: Radian vs. Degree Computing
Master circular trigonometry in degrees and radians, natural and common logarithms, exponential powers, and permutations vs combinations.
Descriptive Statistics: Mean, Median, Variance & Standard Deviation
Arithmetic mean, median, modes, sample vs population standard deviation with Bessel correction, 5-number summaries, and Tukey outlier detection.
Combinatorics and Odds: Permutations, Combinations & Probability Trees
Kolmogorov probability axioms, union and intersection laws for independent events, binomial distributions, and permutations vs combinations.
Calculating High School & College GPA: Credit Hours, Honors & Weighting
Master standard 4.0 quality points, weighted Honors (+0.5) and AP/IB (+1.0) scaling, cumulative transcript blending, and Latin honors classifications.
Ratio & Proportion Math: Scaling Dimensions, Aspect Ratios & Part-to-Part
Euclidean ratio reduction, proportion cross-multiplication equations (A:B = C:D), display aspect ratio resizing, and square-cube scaling laws.
Solving Quadratic Equations: The Quadratic Formula, Discriminant & Vertex
Master the quadratic formula, real and complex discriminant analysis (Δ), parabola vertex (h, k), axis of symmetry, and conic focus/directrix geometry.
Matrix Operations & Linear Algebra: Determinants, Inverses & Transformations
Multiplication dot products, Laplace cofactor determinant expansions, adjugate inversion formulas, matrix transpositions, and Frobenius norms.
Solving Any Triangle: The Laws of Sines, Cosines & Heron's Area
Master SSS, SAS, and ASA triangle solving with the Law of Sines/Cosines, Pythagorean theorem, Heron area formula, and incircle/circumcircle radii.
Analytic Trigonometry of Oblique Triangles: Law of Sines, Ambiguous SSA Cases & Circumradii
Solving AAS, ASA, and ambiguous SSA configurations, circumcircle proofs, and spherical astronomy extensions.
Number Theoretic Foundations of Common Divisors: Euclidean Algorithm & Coprimality
Euclidean division algorithm, prime factorization, Bézout identity, and RSA public-key applications.
Exponential Arithmetic: Power Laws, Fractional Radicals, Negative Indices & Complex Powers
Comprehensive treatment of integer exponents, negative powers, indeterminate forms (0^0), and complex roots.
Relative Statistical Dispersion: The Coefficient of Variation, Risk Ratios & Sample Bias
Normalizing standard deviation across disparate scales, Sokal-Rohlf bias correction, and Sharpe ratio comparisons.
Frequentist Hypothesis Testing in Digital Experimentation: Two-Proportion Z-Scores
Z-test formulations, p-value calculations, statistical power, Type I/II errors, and sample size sizing.
Bernoulli Trials & Discrete Probability: Binomial Distributions, Factorials & Poisson Limits
Derivation of PMF, cumulative distribution functions, log-gamma stable calculations, and normal approximations.
Euclidean Circular Geometry: Archimedean Approximations, Sectors & Segments
Historical quadrature, thin-ring calculus derivations, circular sectors, and engineering tolerance standards.
Digital Logic & Binary Mathematics: Positional Radices, Two's Complement & Bitwise Algebra
Foundations of digital representation, signed two's complement arithmetic, bit shifting, and IEEE 754 floating-point standards.
Cartesian Metrics: Euclidean Distance, Minkowski Norms & Spatial Coordinates
Geometric derivation from Pythagoras, multidimensional vector norms, Manhattan urban grid metrics, and Great-Circle spherical paths.
The Fundamental Theorem of Arithmetic: Prime Factorization, Pollard's Rho & Cryptography
Canonical prime decompositions, divisor functions, aliquot abundance, and computational complexity underlying RSA encryption.
The Law of Cosines: Vector Derivations, Oblique Trigonometry & SSS Triangulation
Dot product proofs, generalizing Pythagoras to obtuse angles, Heron's area formula, and unambiguous triangle solving.
The Least Common Multiple: Number Theory, Multi-Integer Algorithms & Fraction Arithmetic
The duality of LCM and GCD, min/max lattice theory, least common denominators, and mechanical gear resonance.
The Foundations of Logarithms: Napierian Inverses, Change-of-Base & Information Entropy
Napierian history, natural logarithms in continuous calculus, decibels, Richter magnitude, and Shannon information entropy.
Metrology & Error Analysis: Percent Error, Instrumental Uncertainty & Propagation
Systematic calibration vs random noise, error propagation in quadrature, and significant figure tolerances in laboratory assays.
Linear Rate of Change: Cartesian Slopes, Orthogonality & Derivative Foundations
Connecting algebraic rise-over-run to calculus limits, negative reciprocal orthogonality, and civil engineering grade standards.
Exploratory Data Analysis: Tukey Boxplots, Five-Number Summaries & Outlier Fences
Tukey non-parametric order statistics, quartile interpolation conventions, the 1.5 IQR fence rationale, and distribution skewness.
Categorical Data Analysis: Pearson's Chi-Square, Contingency Tables & Residual Modeling
Sum of squared normal variates, contingency independence vs goodness of fit, Cochran's criteria, and Cramér's V effect size.
Inferential Parameter Estimation: Confidence Intervals, Margin of Error & Student's t
Frequentist coverage definitions, Central Limit Theorem square-root scaling, Gosset's t-distribution, and Wilson score intervals.
Bivariate Linear Association: Pearson's r, Anscombe's Quartet & Spurious Correlation
Covariance normalization, Anscombe's quartet visualization imperative, causation fallacies, and OLS regression slopes.
Robust Statistics: The Interquartile Range, Non-Parametric Dispersion & Outlier Fences
Parametric vs non-parametric dispersion, 25% breakdown points, economic net worth modeling, and quartile deviation coefficients.
Survey Metrology: Sample Size Determination, Finite Population Corrections & Power
The economics of sample sizing, the 50% conservative variance ceiling, diminishing returns in polling, and finite population corrections.
The Standard Normal Distribution: Z-Scores, Gaussian Integration & Percentile Scaling
Standardization mechanics, the empirical 68-95-99.7 rule, psychometric T/IQ score translations, and Altman Z-score financial distress.
Todas as calculadoras de Matemática
Calculadora de Juros Compostos
Simule o crescimento patrimonial no longo prazo com aportes recorrentes e desconto da inflação real.
Calculadora de Porcentagem
Calcule aumentos, descontos, proporções e variações percentuais instantaneamente.
Calculadora de Frações
Some, subtraia, multiplique e divida frações próprias, impróprias e números mistos com passo a passo.
Equação de Segundo Grau (Bhaskara)
Resolva ax² + bx + c = 0 com a fórmula de Bhaskara, discriminante e raízes reais ou complexas.
Calculadora Científica
Avalie funções trigonométricas, logarítmicas, exponenciais e fatoriais com precisão.
Calculadora Estatística
Calcule média, mediana, moda, variância, desvio padrão e quartis para conjuntos de dados.
Calculadora de Probabilidade
Calcule permutações nPr, combinações nCr, distribuições binomiais e probabilidade condicional.
Calculadora de Coeficiente de Rendimento (GPA)
Calcule a média acadêmica ponderada por créditos de disciplinas na escala 4.0 ou decimal.
Calculadora de Proporções e Razão
Resolva proporções A:B = C:D, simplifique frações de razão e redimensione escalas.
Calculadora de Matrizes
Execute soma, multiplicação matricial, determinante, matriz inversa e transposta para 2x2 e 3x3.
Calculadora de Triângulos
Resolva triângulos pela lei dos senos, cossenos e Pitágoras, obtendo lados, ângulos e área.
Law of Sines Calculator
Solve oblique triangles with the Sine Rule across AAS, ASA, and the SSA ambiguous case.
Greatest Common Factor Calculator
Find the Greatest Common Factor (GCF / GCD) and Least Common Multiple (LCM) with step-by-step Euclidean division and prime trees.
Exponent Calculator
Calculate powers, negative exponents, fractional roots, and complex numbers with step-by-step exponent laws.
Coefficient of Variation Calculator
Calculate the Coefficient of Variation (CV / RSD) to compare relative dispersion and risk across different scales.
A/B Test Significance Calculator
Evaluate whether conversion differences between control and variant are statistically significant using two-proportion z-tests.
Binomial Distribution Calculator
Compute exact PMF and cumulative CDF binomial probabilities, distribution moments, and discrete histogram projections.
Calculadora de CAGR
Calcule a Taxa de Crescimento Anual Composta (CAGR), ganhos totais e horizonte de duplicação patrimonial.
Calculadora de Valor Futuro
Calcule o montante acumulado futuro combinando capital inicial e depósitos periódicos corrigidos por juros.
Calculadora de Crescimento Populacional
Modele a expansão exponencial malthusiana e o crescimento logístico de Verhulst com capacidade de suporte ambiental.
Calculadora de Área de Círculo
Calcule a área do círculo, diâmetro, circunferência, raio e setor circular.
Calculadora Binária e Conversor de Base
Execute aritmética binária, octal, decimal e hexadecimal com complemento de dois.
Calculadora da Fórmula da Distância
Calcule distâncias euclidianas 2D e 3D, radicais, ponto médio e métrica de Manhattan.
Calculadora de Fatoração Prima
Decomponha números compostos em fatores primos, divisores, função totiente e somas alíquotas.
Calculadora da Lei dos Cossenos
Resolva triângulos oblíquos SAS e SSS, ângulos, perímetro e área pela fórmula de Heron.
Calculadora do Mínimo Múltiplo Comum (MMC)
Calcule o mínimo múltiplo comum e o máximo divisor comum entre múltiplos inteiros.
Calculadora de Logaritmo
Calcule logaritmos naturais (ln), comuns (log10), binários (log2) e de base personalizada.
Calculadora de Porcentagem de Erro
Determine a discrepância experimental, erro relativo e diferença percentual.
Calculadora de Declive e Inclinação
Calcule a inclinação linear, ângulo de inclinação, porcentagem e retas perpendiculares.
Gerador de Boxplot
Gere o resumo de cinco números de Tukey e detecte valores discrepantes (outliers).
Calculadora do Teste Qui-Quadrado
Avalie a independência de tabelas de contingência, aderência, valores-p e V de Cramér.
Calculadora de Intervalo de Confiança
Calcule intervalos de confiança para médias e proporções com margem de erro.
Calculadora do Coeficiente de Correlação de Pearson
Avalie a correlação linear bivariada (r), R², significância do teste t e regressão MQO.
Calculadora de Amplitude Interquartil (IQR)
Determine a dispersão não paramétrica, quartis Q1/Q3 e limites de outliers de Tukey.
Calculadora de Tamanho de Amostra
Determine o tamanho de amostra necessário, margem de erro e correção para população finita.
Calculadora de Escore Z
Converta pontuações brutas em escores Z padronizados, percentis normais e escalas psicométricas.
Authoritative Guides for Matemática
Percentage Calculations in Practice: Relative Change, Deltas & Reversals
Master the 5 percentage formulas, mental math hacks, sales tax back-outs, percentage changes, and asymmetric loss recovery.
Fraction Arithmetic: Common Denominators, Mixed Numbers & Simplification
Euclidean algorithm GCD reduction, least common denominator (LCD) methods, mixed number conversions, and fraction division.
Trigonometric & Transcendental Functions: Radian vs. Degree Computing
Master circular trigonometry in degrees and radians, natural and common logarithms, exponential powers, and permutations vs combinations.
Descriptive Statistics: Mean, Median, Variance & Standard Deviation
Arithmetic mean, median, modes, sample vs population standard deviation with Bessel correction, 5-number summaries, and Tukey outlier detection.
Combinatorics and Odds: Permutations, Combinations & Probability Trees
Kolmogorov probability axioms, union and intersection laws for independent events, binomial distributions, and permutations vs combinations.
Calculating High School & College GPA: Credit Hours, Honors & Weighting
Master standard 4.0 quality points, weighted Honors (+0.5) and AP/IB (+1.0) scaling, cumulative transcript blending, and Latin honors classifications.
Ratio & Proportion Math: Scaling Dimensions, Aspect Ratios & Part-to-Part
Euclidean ratio reduction, proportion cross-multiplication equations (A:B = C:D), display aspect ratio resizing, and square-cube scaling laws.
Solving Quadratic Equations: The Quadratic Formula, Discriminant & Vertex
Master the quadratic formula, real and complex discriminant analysis (Δ), parabola vertex (h, k), axis of symmetry, and conic focus/directrix geometry.
Matrix Operations & Linear Algebra: Determinants, Inverses & Transformations
Multiplication dot products, Laplace cofactor determinant expansions, adjugate inversion formulas, matrix transpositions, and Frobenius norms.
Solving Any Triangle: The Laws of Sines, Cosines & Heron's Area
Master SSS, SAS, and ASA triangle solving with the Law of Sines/Cosines, Pythagorean theorem, Heron area formula, and incircle/circumcircle radii.
Analytic Trigonometry of Oblique Triangles: Law of Sines, Ambiguous SSA Cases & Circumradii
Solving AAS, ASA, and ambiguous SSA configurations, circumcircle proofs, and spherical astronomy extensions.
Number Theoretic Foundations of Common Divisors: Euclidean Algorithm & Coprimality
Euclidean division algorithm, prime factorization, Bézout identity, and RSA public-key applications.
Exponential Arithmetic: Power Laws, Fractional Radicals, Negative Indices & Complex Powers
Comprehensive treatment of integer exponents, negative powers, indeterminate forms (0^0), and complex roots.
Relative Statistical Dispersion: The Coefficient of Variation, Risk Ratios & Sample Bias
Normalizing standard deviation across disparate scales, Sokal-Rohlf bias correction, and Sharpe ratio comparisons.
Frequentist Hypothesis Testing in Digital Experimentation: Two-Proportion Z-Scores
Z-test formulations, p-value calculations, statistical power, Type I/II errors, and sample size sizing.
Bernoulli Trials & Discrete Probability: Binomial Distributions, Factorials & Poisson Limits
Derivation of PMF, cumulative distribution functions, log-gamma stable calculations, and normal approximations.
Euclidean Circular Geometry: Archimedean Approximations, Sectors & Segments
Historical quadrature, thin-ring calculus derivations, circular sectors, and engineering tolerance standards.
Digital Logic & Binary Mathematics: Positional Radices, Two's Complement & Bitwise Algebra
Foundations of digital representation, signed two's complement arithmetic, bit shifting, and IEEE 754 floating-point standards.
Cartesian Metrics: Euclidean Distance, Minkowski Norms & Spatial Coordinates
Geometric derivation from Pythagoras, multidimensional vector norms, Manhattan urban grid metrics, and Great-Circle spherical paths.
The Fundamental Theorem of Arithmetic: Prime Factorization, Pollard's Rho & Cryptography
Canonical prime decompositions, divisor functions, aliquot abundance, and computational complexity underlying RSA encryption.
The Law of Cosines: Vector Derivations, Oblique Trigonometry & SSS Triangulation
Dot product proofs, generalizing Pythagoras to obtuse angles, Heron's area formula, and unambiguous triangle solving.
The Least Common Multiple: Number Theory, Multi-Integer Algorithms & Fraction Arithmetic
The duality of LCM and GCD, min/max lattice theory, least common denominators, and mechanical gear resonance.
The Foundations of Logarithms: Napierian Inverses, Change-of-Base & Information Entropy
Napierian history, natural logarithms in continuous calculus, decibels, Richter magnitude, and Shannon information entropy.
Metrology & Error Analysis: Percent Error, Instrumental Uncertainty & Propagation
Systematic calibration vs random noise, error propagation in quadrature, and significant figure tolerances in laboratory assays.
Linear Rate of Change: Cartesian Slopes, Orthogonality & Derivative Foundations
Connecting algebraic rise-over-run to calculus limits, negative reciprocal orthogonality, and civil engineering grade standards.
Exploratory Data Analysis: Tukey Boxplots, Five-Number Summaries & Outlier Fences
Tukey non-parametric order statistics, quartile interpolation conventions, the 1.5 IQR fence rationale, and distribution skewness.
Categorical Data Analysis: Pearson's Chi-Square, Contingency Tables & Residual Modeling
Sum of squared normal variates, contingency independence vs goodness of fit, Cochran's criteria, and Cramér's V effect size.
Inferential Parameter Estimation: Confidence Intervals, Margin of Error & Student's t
Frequentist coverage definitions, Central Limit Theorem square-root scaling, Gosset's t-distribution, and Wilson score intervals.
Bivariate Linear Association: Pearson's r, Anscombe's Quartet & Spurious Correlation
Covariance normalization, Anscombe's quartet visualization imperative, causation fallacies, and OLS regression slopes.
Robust Statistics: The Interquartile Range, Non-Parametric Dispersion & Outlier Fences
Parametric vs non-parametric dispersion, 25% breakdown points, economic net worth modeling, and quartile deviation coefficients.
Survey Metrology: Sample Size Determination, Finite Population Corrections & Power
The economics of sample sizing, the 50% conservative variance ceiling, diminishing returns in polling, and finite population corrections.
The Standard Normal Distribution: Z-Scores, Gaussian Integration & Percentile Scaling
Standardization mechanics, the empirical 68-95-99.7 rule, psychometric T/IQ score translations, and Altman Z-score financial distress.
Editorial Articles for Matemática
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