Mean, median & variation Calculator
Compare average, range, population and sample variation.
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5 free tools
Statistics Calculators
Statistical calculators for averages, variation, regression, independent probabilities, survey sample sizes and intervals. Each calculator explains its inputs, formula and limits.
Mean confidence interval, known SD Calculator
Calculate a two-sided normal confidence interval when population SD is known.
Open calculator →Linear regression & correlation Calculator
Fit paired values, report slope and R², and calculate a specified prediction.
Open calculator →Independent event probabilities Calculator
Calculate intersections, unions and repeat-trial success chances.
Open calculator →Survey response sample size Calculator
Estimate completed responses for a proportion with finite-population correction.
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