Summarise data, explore its distribution and assess relationships before choosing an inference method.
Which calculator should I use?
Start with descriptive statistics for centre and spread. Choose percentiles for position, frequency tables for counts, and correlation for paired measurements. Distribution fit helps examine a proposed model; it does not prove that a model is correct.
Available calculators
Descriptive Statistics
Turn a list of values into a clear statistical summary and a quick distribution view.
Z-Score and Standard Score Calculator
Convert a value to a z-score, invert a z-score, or standardize data.
Percentile, Quartile, and Box Plot Calculator
Summarize ordered values, calculate a percentile, and flag 1.5×IQR outliers.
Frequency Table and Histogram Calculator
Count categories or group numeric data into equal-width bins.
Correlation and Covariance Calculator
Calculate Pearson and Spearman association from paired rows.
Distribution Fit and Normality Calculator
Fit a normal or exponential distribution, inspect a Q–Q plot, and assess normal skew and tails.