🧮Calculators

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Recipe Yield & Scaler

Calculate how many servings a recipe yields and scale the ingredients up or down. Adapt any dish to the number of guests without messing up the amounts.

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Tempo p/ Descongelar (Geladeira)

Estima tempo para descongelar carnes na geladeira: aprox. 24 h por 2 kg.

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Duração de Nota por BPM

Calcula a duração em ms de cada figura rítmica para um dado BPM.

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Intervalo Musical (semitons)

Identifica o intervalo musical a partir do número de semitons entre duas notas.

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1RM Lombardi Calculator

Estimate your one-rep max (1RM) with the Lombardi formula from the weight lifted and reps performed. Plan training loads without attempting a true max.

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FC Máxima Tanaka

FC máxima pela fórmula Tanaka: 208 − 0.7 × idade.

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Gordura YMCA Circ.

Calcula % gordura corporal por circunferência da cintura (homem) ou método YMCA simplificado.

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FFMI Calculator

Calculate your FFMI (fat-free mass index), which measures muscle mass relative to height. A useful alternative to BMI for people who lift weights.

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Anos-luz → Tempo

Tempo (anos) para percorrer uma distância em anos-luz a uma % da velocidade da luz.

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BMI Calculator (Adults)

Calculate your BMI (Body Mass Index) from weight and height and see the WHO classification, from underweight to obese. Fast and no sign-up needed.

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Espresso Extraction Time

Find the ideal extraction time for your espresso (around 25 to 30 seconds for 30 ml). Dial in your coffee and adjust the grind for a perfect shot.

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Fatoração em Primos

Decompõe um inteiro em fatores primos (ex: 360 = 2³·3²·5).

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MDC (Algoritmo de Euclides)

Calcula MDC (máximo divisor comum) de dois inteiros usando algoritmo de Euclides.

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LCM Calculator (Two Numbers)

Calculate the least common multiple (LCM) of two integers. See the steps using the relation LCM = |a·b| / GCD. Handy for fractions and school problems.

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Modular Inverse Calculator

Calculate the modular inverse a⁻¹ mod m with the extended Euclidean algorithm. The inverse exists when a and m are coprime. Key in cryptography and number theory.

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Modular Exponentiation Calculator

Calculate modular exponentiation (b to the power e, modulo m) fast with the square-and-multiply method. Essential in RSA cryptography and number theory.

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Raízes Equação Quadrática

Resolve ax²+bx+c=0 mostrando discriminante e raízes (reais ou complexas).

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Raízes Cúbica (Cardano)

Resolve x³+px+q=0 pela fórmula de Cardano (forma deprimida).

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2x2 Matrix Determinant and Inverse

Calculate the determinant and inverse of a 2x2 matrix from its four entries. See the step-by-step and the exact result in fractions or decimals.

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3x3 Matrix Determinant Calculator

Calculate the determinant of a 3x3 matrix using Sarrus' rule from its nine entries. See the worked-out calculation and the result instantly.

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Produto Vetorial 3D (Cross)

Calcula a × b para dois vetores 3D — resultado é ortogonal aos dois.

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3D Dot Product Calculator

Calculate the dot product (scalar product) of two 3D vectors from their x, y and z coordinates. Useful in physics, computer graphics and vector geometry.

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3D Vector Magnitude Calculator

Calculate the magnitude (length or norm) of a 3D vector from its x, y and z coordinates. Useful in physics, engineering and computer graphics.

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Soma de Números Complexos

Soma (a + bi) + (c + di) = (a+c) + (b+d)i.

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Multiplicação de Complexos

Multiplica (a + bi) × (c + di) = (ac − bd) + (ad + bc)i.

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Módulo e Fase de Complexo

Para z = a + bi, calcula |z| = √(a²+b²) e arg(z) = atan2(b,a).

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Polinômio (Horner)

Avalia polinômio em x usando método de Horner. Coeficientes do maior para o menor grau separados por vírgula.

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Pascal Triangle Row Calculator

Generate any row of Pascal triangle by entering the row number. See the binomial coefficients instantly — useful for combinatorics, algebra and math study.

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Fibonacci N-ésimo

Retorna o n-ésimo termo da sequência de Fibonacci (F₀=0, F₁=1).

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Large Factorial Calculator

Calculate the factorial of large numbers (n!) with arbitrary precision using BigInt, with no lost digits. Ideal for combinatorics and probability.

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Binomial Coefficient C(n,k) Calculator

Calculate the binomial coefficient C(n,k): the number of ways to choose k items from n, with no overflow. Key in probability and combinatorics.

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Permutations P(n,k) Calculator

Calculate permutations P(n,k), the number of ordered arrangements of k items chosen from n. Useful for probability, draws and combinatorics.

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Combinations Calculator C(n,k)

Calculate combinations C(n,k): how many ways you can choose k items from a set of n, where order does not matter. The basis of combinatorics.

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GCD of Multiple Numbers Calculator

Calculate the GCD (greatest common divisor) of a list of integers all at once. Enter the values separated by commas and see the result instantly.

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Teste de Primalidade

Verifica se n é primo (trial division até √n) — adequado para n até ~10¹².

φ

Função φ de Euler (Totiente)

Calcula φ(n) = quantidade de inteiros em [1,n] coprimos com n. Usa fatoração.

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Frações Parciais 1/(ax+b)(cx+d)

Decompõe 1/((ax+b)(cx+d)) = A/(ax+b) + B/(cx+d). Requer ad ≠ bc.

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One-Sample t-Test Calculator

Calculate the t-statistic for a one-sample t-test from the mean, standard deviation and sample size. Compare your sample mean against a reference value.

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Chi-Square Goodness-of-Fit Calculator

Calculate the chi-square (χ²) goodness-of-fit statistic from observed and expected frequencies. Test whether your data follows the expected distribution.

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Pearson Correlation Calculator

Calculate the Pearson correlation coefficient (r) between two data sets and measure the strength of the linear relationship, from -1 to +1.

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Regressão Linear y = ax + b

Ajusta reta y = ax + b por mínimos quadrados a partir de pares X, Y.

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Normal CDF Φ(z) (aprox)

Aproxima Φ(z) (acumulada da N(0,1)) via erf de Abramowitz-Stegun.

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Normal Distribution PDF Calculator

Calculate the probability density of the normal (Gaussian) distribution at a point, from the mean and standard deviation. Key in statistics and data science.

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Standard Error of the Mean Calculator

Calculate the standard error of the mean (SEM) from the standard deviation and sample size. A key metric in statistics, research and confidence intervals.

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IC da Média (z, σ conhecido)

IC para μ com σ conhecido: x̄ ± z·σ/√n. Aceita 90%, 95%, 99%.

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p-valor Z (uma cauda)

Calcula p-valor unilateral a partir de estatística z (cauda à direita).

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Descriptive Statistics Calculator

Calculate descriptive statistics for a list of numbers: mean, median, mode, variance and standard deviation. Paste your data and see every result.

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Quartiles & IQR Calculator

Calculate the quartiles (Q1, Q2/median, Q3) and the interquartile range (IQR) of a list of numbers. Spot the spread and possible outliers in your data.

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MAD (Desvio Absoluto Mediano)

Calcula MAD = mediana(|xᵢ − mediana(x)|) — medida robusta de dispersão.

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RMSE entre Listas

Calcula RMSE = √(Σ(yᵢ − ŷᵢ)² / n) entre duas listas de mesmo tamanho.

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Amplitude, Variância e Desvio

Calcula amplitude (max−min), variância amostral (s²) e desvio-padrão amostral (s).

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Geometric Mean Calculator

Calculate the geometric mean of a list of positive numbers, ideal for growth rates, returns and indexes. Enter the values and see the result instantly.

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Harmonic Mean Calculator

Calculate the harmonic mean of a list of numbers, best suited for averaging rates, speeds and ratios. Enter the values and get the result instantly.

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Rank Percentil de Valor

Calcula a posição percentual de x no conjunto: 100·(L + 0.5·E)/n.

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Probabilidade Soma de Dados

P(soma = s) com N dados de 6 faces — via DP (convolução).

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Probabilidade Sequência de Caras

P(pelo menos k caras seguidas em n lançamentos de moeda justa) — DP.

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Lottery Odds (6/60)

Find out the real odds of winning a 6/60 lottery like the Brazilian Mega-Sena. See how unlikely the jackpot truly is, compared with everyday events.

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Avaliador Mão Poker (5 cartas)

Classifica mão de 5 cartas (ex: "AS,KS,QS,JS,TS"). Naipes: S,H,D,C. Valores: 2-9,T,J,Q,K,A.

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Paradoxo do Aniversário

P(pelo menos 2 pessoas com mesmo aniversário em grupo de n) — modelo 365 dias.

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Teorema de Bayes

P(A|B) = P(B|A)·P(A) / [P(B|A)·P(A) + P(B|¬A)·P(¬A)].