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

Topics: All Descriptive (29) Probability (35)

Statistics / Descriptive

Mean, Median, Mode Calculator

Paste a list of numbers to get mean, median, mode, range, and standard deviation instantly.

basic

1,108 4.0 1 min

Statistics / Descriptive

Standard Deviation Calculator

Calculate sample and population standard deviation with variance and z-scores for each value.

basic

13,785 3.9 1 min

Statistics / Descriptive

Variance Calculator

Population and sample variance of a dataset, with the standard deviation shown alongside.

basic

4,968 3.9 1 min

Statistics / Descriptive

Quartile Calculator

Compute the five-number summary (min, Q1, median, Q3, max), interquartile range, and 1.5×IQR outliers from a list of num...

basic

1,681 4.2 1 min

Statistics / Descriptive

Linear Regression Calculator

Fit an ordinary least-squares regression line to two equal-length lists of numbers and report slope, intercept, r, and r...

basic

10,480 4.1 1 min

Statistics / Descriptive

Confidence Interval Calculator

Compute the lower and upper bounds of a confidence interval for a sample mean given the sample size, mean, standard devi...

basic

23,770 4.3 1 min

Statistics / Descriptive

Margin of Error Calculator

Estimate the margin of error of a survey result from sample size, observed proportion, and confidence level.

basic

11,300 4.2 1 min

Statistics / Descriptive

Correlation Coefficient Calculator

Compute the Pearson correlation coefficient (r), r², and the slope/intercept of the best-fit line for two equal-length l...

basic

1,482 4.8 1 min

Statistics / Descriptive

Coefficient of Variation Calculator

Calculate the coefficient of variation (CV) — a unitless measure of dispersion that lets you compare the spread of data...

basic

9,255 3.9 1 min

Statistics / Descriptive

Two-Sample Z-Test Statistic Calculator

Calculates the z-statistic for comparing two sample means when population variances are known: z = (x̄₁ − x̄₂) / √(σ₁²/n...

basic

1,433 4.1 1 min

Statistics / Descriptive

Pearson Correlation from Sums Calculator

Computes the Pearson correlation coefficient r from aggregate statistics without raw data: r = [nΣXY − ΣXΣY] / √{[nΣX² −...

basic

7,548 4.1 1 min

Statistics / Descriptive

Z-Score from Raw Score, Mean, and SD Calculator

Calculates the z-score: z = (X − μ) / σ, indicating how many standard deviations X is from the mean μ. Also computes the...

basic

22,446 4.7 1 min

Statistics / Descriptive

Confidence Interval for Mean (Known σ) Calculator

Constructs a confidence interval for a population mean using the z-distribution: CI = x̄ ± z* · (σ/√n). Common z* values...

basic

3,240 4.5 1 min

Statistics / Descriptive

Sample Variance and Standard Deviation from Summary Stats Calculator

Calculates sample variance s² = [Σx² − (Σx)²/n] / (n−1) and sample standard deviation s = √s² from the sum of squares, s...

basic

17,190 4.4 1 min

Statistics / Descriptive

Weighted Mean from Values and Frequencies Calculator

Calculates x̄_w = Σ(w_i · x_i) / Σw_i for up to six value/weight pairs. Used in grade calculations, portfolio returns, a...

basic

6,502 5.0 1 min

Statistics / Descriptive

Interquartile Range from Q1 and Q3 Calculator

Calculates IQR = Q3 − Q1. Also computes the lower and upper fences for outlier detection: lower = Q1 − 1.5×IQR, upper =...

basic

23,837 4.1 1 min

Statistics / Descriptive

Normal Distribution Z-Score and Percentile Calculator

Calculates z-score z = (x − μ)/σ and approximate one-tailed percentile using the rational approximation of the standard...

basic

13,250 5.0 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

12,802 4.1 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

15,866 4.7 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

14,750 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

4,964 4.4 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

12,429 4.2 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

1,826 4.9 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

4,804 4.4 1 min

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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

Mean, Median, Mode Calculator

Standard Deviation Calculator

Variance Calculator

Quartile Calculator

Linear Regression Calculator

Confidence Interval Calculator

Margin of Error Calculator

Correlation Coefficient Calculator

Coefficient of Variation Calculator

Two-Sample Z-Test Statistic Calculator

Pearson Correlation from Sums Calculator

Z-Score from Raw Score, Mean, and SD Calculator

Confidence Interval for Mean (Known σ) Calculator

Sample Variance and Standard Deviation from Summary Stats Calculator

Weighted Mean from Values and Frequencies Calculator

Interquartile Range from Q1 and Q3 Calculator

Normal Distribution Z-Score and Percentile Calculator

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

Kendall's Tau Rank Correlation Calculator

Simple Linear Regression Slope and Intercept Calculator

IQR & Outlier Fence Calculator

Interquartile Range and Five-Number Summary Calculator

Coefficient of Variation (CV) Dispersion Calculator

Trimmed Mean and Data Percentile Calculator