Statistics & Probability Calculators
Descriptive analytics, probability, and data sampling.
Weighted, Geometric & Harmonic Average Calculator
Compute Weighted Average ($w_i$), Geometric Mean ($\sqrt[n]{\prod x_i}$), and Harmonic Mean.
Confidence Interval Calculator for the Mean
Compute Confidence Interval ( $CI = \bar{x} \pm Z \frac{s}{\sqrt{n}}$ ) and Margin of Error ($ME$) for population mean.
Mean, Median, Mode & Range Calculator
Compute key measures of central tendency and dispersion: Arithmetic Mean ( $\bar{x}$ ), Median, Mode, and Range for a dataset.
P-Value & Statistical Significance Calculator
Evaluate P-Value ( $p$-value ) and Statistical Significance for hypothesis testing given a $Z$ score.
Permutations & Combinations Calculator (nPr & nCr)
Compute Combinations ( $nCr = \frac{n!}{r!(n-r)!}$ ) and Permutations ( $nPr = \frac{n!}{(n-r)!}$ ) for $n$ items chosen $r$ at a time.
Simple & Compound Event Probability Calculator
Compute Classical Probability ( $P(A) = \frac{\text{favorable}}{\text{total}}$ ), Complementary Event ( $P(A^c) = 1 - P(A)$ ), and Odds.
Sample Size Calculator for Surveys & Research
Compute required sample size ($n$) for research and surveys based on Population size ($N$), Margin of Error ($e$), and Confidence Level.
Standard Deviation & Variance Calculator
Compute Sample ($s$) and Population ($\sigma$) Standard Deviation, Variance ($s^2, \sigma^2$), and Standard Error.
Comprehensive Statistics Summary & Coefficient of Variation Calculator
Compute Coefficient of Variation ( $CV = \frac{s}{\bar{x}} \times 100\%$ ), Standard Error of Mean ($SEM$), and full summary.
Z-Score & Normal Probability Calculator
Compute Z-Score ( $Z = \frac{X - \mu}{\sigma}$ ), standardizing a value $X$ given Mean ( $\mu$ ) and Standard Deviation ( $\sigma$ ).