StatsCalculator
Free statistics calculators with a saved-data workspace. Enter data once, reuse it across every tool, and share results with a link.
Descriptive
- Descriptive StatisticsMean, median, mode, spread, quartiles, histogram & box plot.
- Sample MeanArithmetic average with count and sum.
- MedianMiddle value, correct for even and odd counts.
- ModeMost frequent value(s) with a frequency table.
- Standard DeviationSample and population SD, variance, histogram.
- Mean Absolute DeviationAverage distance from the mean.
- Sum of SquaresTotal squared deviation, with the working shown.
Spread & position
- QuartilesQ1, median, Q3 with a box plot.
- Interquartile RangeIQR = Q3 − Q1.
- Quintiles20/40/60/80th percentiles.
- Deciles10th–90th percentiles.
- OutliersTukey 1.5×IQR fences and a box plot.
- Box & Whisker PlotFive-number summary with outliers.
Probability distributions
- NormalGaussian density and cumulative probability.
- BinomialSuccesses in n trials.
- BernoulliA single success/failure trial.
- PoissonEvents at an average rate λ.
- GeometricTrials until the first success.
- Negative BinomialFailures before the r-th success.
- HypergeometricDraws without replacement.
- ExponentialTime between events.
- GammaShape k, scale θ.
- Chi-SquareSum of squared normals.
- FRatio of variances.
- BetaDistribution on [0, 1].
- WeibullReliability / lifetimes.
- LognormalLog of the variable is normal.
- ParetoPower-law distribution.
Inference
- Confidence Intervalt-based interval for the mean.
- One-Sample t-TestCompare a mean to μ₀.
- Two-Sample t-TestCompare two sample means.
- Z-ScoreStandardize each value.
- Z Critical ValueCritical z for a significance level.
- t Critical ValueCritical t for α and df.
- P-Value from tt and df to a p-value.
- P-Value from zz-score to a p-value.
Regression & correlation
- Correlation CoefficientPearson r, significance, fitted line.
- Linear RegressionOLS line of best fit with R².
- Quadratic RegressionFit y = ax² + bx + c with the curve.
- Scatter PlotPlot (x, y) pairs with an optional fit.