Statistics Calculators
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Choose a statistics calculator by the question you need to answer, then keep the data convention visible beside the result.
Choose a method
Mean Median Mode CalculatorCalculate mean, median, mode, range, count and sum from a pasted data set with visible parsing and formulas.Five-Number Summary CalculatorCalculate minimum, Q1, median, Q3, maximum and IQR with the median-of-halves convention stated beside the result.Arithmetic Mean CalculatorCalculate the arithmetic mean, sum and count from a numeric list without silently dropping invalid tokens.Average CalculatorCalculate a weighted average from matching value and weight lists with an auditable weighted sum.Coefficient of Determination CalculatorCalculate R squared from observed and predicted values with SSE, SST and negative-result support.Coefficient of Variation CalculatorCalculate coefficient of variation from a data set with an explicit sample or population standard-deviation choice.Covariance CalculatorCalculate sample or population covariance from paired X and Y lists and inspect the cross-deviation sum.Descriptive Statistics CalculatorGenerate an audit-ready summary of center, spread and quartiles with visible sample/population and quartile conventions.Geometric Mean CalculatorCalculate geometric mean for positive values using a logarithmic method that avoids premature product rounding.Grouped Data Mean CalculatorCalculate a frequency-weighted mean from values or class midpoints and show sum of fx and total frequency.Harmonic Mean CalculatorCalculate harmonic mean for positive rates and inspect the reciprocal sum used by the formula.
Data conventions
CalculatorGeek names the sample or population denominator, median-of-halves quartile convention, rejected-token behavior and rounding rule instead of hiding them.
Frequently asked questions
Is average always the arithmetic mean?
No. Weighted, geometric and harmonic means answer different questions.
Why can quartiles differ?
Textbooks and software use different endpoint and interpolation conventions.
Does covariance show strength?
Its units affect magnitude; use a standardized measure for unit-free comparison.