Statistics calculators

Probability, sampling, and descriptive statistics made readable.

Means, medians, standard deviations, confidence intervals, and sample size planning — with formulas and worked examples for each tool.

Calculators

103

Topics: All Descriptive (29) Probability (35)

Statistics

Log-Normal Distribution μ & σ Calculator

Calculates the PDF, CDF, mean, median, mode, and variance of a log-normal distribution from its log-scale parameters μ a...

basic

3,357 4.9 1 min

Statistics / Descriptive

One-Way ANOVA F-Ratio from Between and Within Variance Calculator

Calculates F-ratio = MS_between / MS_within from sum of squares between and within groups. Returns F, degrees of freedom...

basic

12,801 4.1 1 min

Statistics

Mann-Whitney U Rank Sum Test Calculator

Calculates the Mann-Whitney U statistic from group sizes and the rank sum of group 1 to test for differences between two...

basic

2,873 5.0 1 min

Statistics / Probability

Discrete Uniform Distribution Probability Calculator

Calculates probability mass, mean μ = (a+b)/2, variance σ² = (n²−1)/12, and P(X ≤ k) for a discrete uniform distribution...

basic

2,825 4.8 1 min

Statistics

Spearman Rank Correlation Calculator

Calculates Spearman's rank correlation coefficient ρ from the sum of squared rank differences and sample size.

basic

2,639 4.6 1 min

Statistics

Spearman's Rank Correlation rs Calculator

Calculates Spearman's rank correlation coefficient rs from the sum of squared rank differences and number of observation...

basic

24,252 4.7 1 min

Statistics / Descriptive

Kendall's Tau Rank Correlation Calculator

Calculates Kendall's tau τ = (C − D) / (n(n−1)/2), where C is concordant pairs and D is discordant pairs. Robust alterna...

basic

15,865 4.7 1 min

Statistics

OLS Linear Regression Line Calculator

Computes OLS regression slope b1 and intercept b0 from summary statistics (means, variances, covariance), and predicts ŷ...

basic

14,807 4.3 1 min

Statistics

Confidence Interval z-Critical Bounds Calculator

Calculates the confidence interval for a population mean from sample mean, known standard deviation, sample size, and co...

basic

24,937 3.9 1 min

Statistics

Negative Binomial Failures Before k-th Success

Calculates the probability of exactly r failures before the k-th success in independent Bernoulli trials using the negat...

basic

19,988 4.9 1 min

Statistics / Descriptive

Simple Linear Regression Slope and Intercept Calculator

Calculates OLS regression coefficients from summary statistics: slope b = Sxy/Sxx, intercept a = ȳ − b·x̄, R² = Sxy²/(Sx...

basic

14,749 4.3 1 min

Statistics / Descriptive

IQR & Outlier Fence Calculator

Calculates the interquartile range (IQR), Tukey lower/upper fences for outlier detection, and box-plot summary from Q1,...

basic

4,963 4.4 1 min

Statistics

Kolmogorov-Smirnov One-Sample Test Calculator

Calculates the one-sample Kolmogorov-Smirnov test statistic D from the maximum deviation between empirical and theoretic...

basic

21,682 4.3 1 min

Statistics / Descriptive

Interquartile Range and Five-Number Summary Calculator

Given Q1, median, Q3, min, and max, calculates IQR = Q3 − Q1, inner fences (Q1 − 1.5×IQR, Q3 + 1.5×IQR) for outlier dete...

basic

12,428 4.2 1 min

Statistics / Probability

Law of Total Probability from Conditional Probabilities Calculator

Calculates the total probability of event B using the law of total probability: P(B) = P(B|A₁)·P(A₁) + P(B|A₂)·P(A₂) + P...

basic

7,945 4.9 1 min

Statistics

Minimum Sample Size for Survey Accuracy Calculator

Calculates the minimum sample size needed for a survey or proportion estimate at a specified confidence level and margin...

basic

7,206 3.9 1 min

Statistics / Descriptive

Coefficient of Variation (CV) Dispersion Calculator

Calculates the coefficient of variation (CV) as a percentage to compare variability between datasets with different mean...

basic

1,825 4.9 1 min

Statistics / Probability

Chebyshev's Probability Bound Calculator

Applies Chebyshev's inequality to give a distribution-free bound on the probability of a value lying more than k standar...

basic

15,866 4.6 1 min

Statistics / Probability

Odds Ratio and Relative Risk from 2×2 Table Calculator

Calculates odds ratio OR = (a·d)/(b·c) and relative risk RR = (a/(a+b)) / (c/(c+d)) from a 2×2 exposure/outcome continge...

basic

15,232 3.9 1 min

Statistics / Descriptive

Trimmed Mean and Data Percentile Calculator

Calculates the 10% trimmed mean (removes top 10% and bottom 10%) given n, overall mean, and the sum of the α-fraction va...

basic

4,803 4.4 1 min

Statistics / Probability

Bayes Theorem Posterior Update Calculator

Applies Bayes' theorem to update a prior probability with new evidence, outputting the posterior probability and likelih...

basic

4,180 4.6 1 min

Statistics

Bootstrap Standard Error & Resampling Calculator

Estimates standard error from a sample using the bootstrap approximation from sample standard deviation and sample size.

basic

1,995 4.7 1 min

Statistics / Descriptive

Covariance from Paired Sums Calculator

Calculates sample covariance Cov(X,Y) = [ΣXY − (ΣX)(ΣY)/n] / (n−1) and population covariance / (n). Also shows the sign...

basic

16,517 4.8 1 min

Statistics / Probability

Log-Normal Distribution Mean and Variance Calculator

Calculates the log-normal mean E[X] = exp(μ+σ²/2), median exp(μ), mode exp(μ−σ²), and variance (e^(σ²)−1)·e^(2μ+σ²) from...

basic

15,696 4.1 1 min

Showing 73 to 96 of 103 results

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Means, medians, standard deviations, confidence intervals, and sample size planning — with formulas and worked examples for each tool.

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Statistics calculators

Log-Normal Distribution μ & σ Calculator

One-Way ANOVA F-Ratio from Between and Within Variance Calculator

Mann-Whitney U Rank Sum Test Calculator

Discrete Uniform Distribution Probability Calculator

Spearman Rank Correlation Calculator

Spearman's Rank Correlation rs Calculator

Kendall's Tau Rank Correlation Calculator

OLS Linear Regression Line Calculator

Confidence Interval z-Critical Bounds Calculator

Negative Binomial Failures Before k-th Success

Simple Linear Regression Slope and Intercept Calculator

IQR & Outlier Fence Calculator

Kolmogorov-Smirnov One-Sample Test Calculator

Interquartile Range and Five-Number Summary Calculator

Law of Total Probability from Conditional Probabilities Calculator

Minimum Sample Size for Survey Accuracy Calculator

Coefficient of Variation (CV) Dispersion Calculator

Chebyshev's Probability Bound Calculator

Odds Ratio and Relative Risk from 2×2 Table Calculator

Trimmed Mean and Data Percentile Calculator

Bayes Theorem Posterior Update Calculator

Bootstrap Standard Error & Resampling Calculator

Covariance from Paired Sums Calculator

Log-Normal Distribution Mean and Variance Calculator