Calculadoras de Matemática
Percentagens, médias, estatística e matemática do dia a dia de forma simples.
29 calculadoras
Todas as calculadoras
- Calculadora de PercentagemCalculadora de percentagem online: calcule X% de um número, que percentagem X representa de Y e a variação percentual entre dois valores.
- Calculadora de DescontoCalcule o preço final após o desconto. Introduza o preço original e a percentagem de desconto para saber quanto paga e quanto poupa.
- Calculadora de MédiaCalcule a média, a mediana, a soma, o mínimo e o máximo de uma lista de números. Cole ou escreva valores separados por vírgulas ou espaços.
- Calculadora de Desvio PadrãoCalcule o desvio padrão amostral ou populacional, a variância e a média de uma lista de números. Ferramenta de estatística rápida e gratuita.
- Calculadora de RáciosSimplifique um rácio até à forma mais simples ou resolva uma proporção para o valor em falta. Introduza A:B para reduzir ou A:B = C:D para resolver.
- Calculadora de erro percentualCalcule o erro percentual entre um valor experimental e o valor real, ou a diferença percentual entre duas medidas, com o desenvolvimento passo a passo.
- Calculadora de MDC e MMCEncontre o máximo divisor comum e o mínimo múltiplo comum de qualquer lista de números, com as fatorações em primos e a lista completa de divisores comuns.
- Calculadora da fórmula quadráticaResolva qualquer equação do segundo grau ax² + bx + c = 0 com raízes reais ou complexas, e obtenha o discriminante, o vértice, o eixo de simetria e a forma fatorada.
- Calculadora de fraçõesSome, subtraia, multiplique ou divida duas frações e obtenha o resultado exato simplificado, além das formas de número misto, decimal e porcentagem.
- Calculadora de inclinaçãoEncontre a inclinação (coeficiente angular) entre dois pontos, além da equação da reta, suas interseções, o ângulo, o comprimento, o ponto médio e a inclinação perpendicular.
- Probability CalculatorCalculate the probability of two events happening together, either one happening, neither happening, and the chance of at least one success across repeated trials.
- Combinations & Permutations CalculatorCalculate nCr and nPr with and without repetition, plus factorials — and see exactly when order matters and when it does not.
- Statistics CalculatorGet the mean, median, mode, range, variance, standard deviation, and quartiles of a data set in one step, with the working shown.
- Z-Score CalculatorCalculate a z-score from a value, mean, and standard deviation, and convert it to a percentile and tail probabilities on the normal distribution.
- Logarithm CalculatorCalculate the logarithm of a number in any base, plus the natural log (ln) and common log (log₁₀), and go the other way with exponents.
- Percentage Change CalculatorFind the percentage increase or decrease between two numbers, with the exact change, the direction, and the multiplier — and see why a rise then an equal fall doesn't return you home.
- Exponent CalculatorRaise any base to any power — including negative, zero, and fractional exponents — and see the result with the rule that explains what the exponent means.
- Scientific Notation ConverterConvert any number to and from scientific notation, plus engineering notation and E-notation, with the order of magnitude and expanded standard form.
- Prime Number CalculatorCheck whether a number is prime, and get its prime factorization, number of divisors, and the nearest prime numbers above and below it.
- Square Root CalculatorFind the square root or any nth root of a number, with the simplified exact radical form, a perfect-power check, and the negative root for even roots.
- Proportion CalculatorSolve a proportion a/b = c/x for the missing value by cross multiplication, and check whether two ratios are equal — the maths of scaling and conversion.
- Sequence CalculatorFind the nth term and the sum of an arithmetic or geometric sequence from the first term, the common difference or ratio, and the number of terms.
- Modulo CalculatorCompute the remainder (modulo) and quotient of a division, with both the truncated and floored conventions shown so the negative-number cases are unambiguous.
- Rounding CalculatorRound a number to decimal places, significant figures, or the nearest multiple, with round-up and round-down shown alongside the standard rounded result.
- Factorial CalculatorCompute the factorial n! — the product of all integers up to n — with the number of digits and trailing zeros, for any n from 0 to 170.
- Confidence Interval CalculatorCalculate a confidence interval for a mean from the sample mean, standard deviation, and size, with the margin of error and standard error at your chosen confidence level.
- Sample Size CalculatorCalculate the survey sample size needed for a chosen margin of error and confidence level, with a finite-population correction for smaller populations.
- Linear Equation CalculatorFind the equation of a line through two points in slope-intercept form (y = mx + b), with the slope, x- and y-intercepts, and the line's angle.
- System of Equations CalculatorSolve a system of two linear equations in two variables (a₁x + b₁y = c₁, a₂x + b₂y = c₂) using Cramer's rule, with a diagnosis of no or infinite solutions.