Statistics & Probability Calculators
Statistics calculators summarize a list of numbers. Find the mean, median and mode of a data set, a weighted average, and the standard deviation of a sample or population. Count ordered arrangements with the permutation calculator and unordered selections with the combination calculator. Estimate a survey sample size for a proportion or a mean with the sample size calculator.
Last updated November 4, 2026
All Statistics & Probability tools
Math & Statistics · Statistics & Probability
Average CalculatorMean, median, mode, sum and range of a list of numbers
Math & Statistics · Statistics & Probability
Standard Deviation CalculatorStandard deviation and variance of a sample or a population
Math & Statistics · Statistics & Probability
Weighted Average CalculatorAverage of values that count for different amounts, with each weight shown
Math & Statistics · Statistics & Probability
Permutation CalculatorOrdered arrangements nPr of r items from n, with or without repetition
Math & Statistics · Statistics & Probability
Combination CalculatorUnordered selections nCr of r items from n, with or without repetition
Math & Statistics · Statistics & Probability
Z-Score CalculatorZ-score, percentile and tail probabilities from a value, mean and standard deviation
Math & Statistics · Statistics & Probability
Probability CalculatorSingle event, A and B, A or B, conditional and repeated-trial probability with odds
Math & Statistics · Statistics & Probability
Statistics CalculatorMean, median, mode, quartiles, standard deviation and outliers of a list of numbers
Math & Statistics · Statistics & Probability
Sample Size CalculatorSurvey sample size for a proportion or mean, with finite population correction
Math & Statistics · Statistics & Probability
Margin of Error CalculatorMargin of error for a survey proportion, with optional population correction
Math & Statistics · Statistics & Probability
Confidence Interval CalculatorConfidence interval for a mean (z or t) or a proportion
Related tools
Math & Statistics · Arithmetic & Percentages
Percentage CalculatorPercent of a number, percent change and percent increase or decrease
Math & Statistics · Arithmetic & Percentages
Ratio CalculatorSimplify a ratio or solve a proportion for the missing number
Math & Statistics · Geometry
Slope CalculatorSlope, line equation, angle and distance from two points
Math & Statistics · Geometry
Volume CalculatorVolume of a cube, box, cylinder, cone, sphere or pyramid
Math & Statistics · Arithmetic & Percentages
LCM CalculatorLeast common multiple of 2 to 10 numbers, with prime factors