All Statistics calculators10 calculators

Probability & data analysis

• Mean, Median & Mode CalculatorPaste a list of numbers to instantly get the mean, median, mode, range, count and sum — the full descriptive statistics set.
• Standard Deviation CalculatorCalculate sample and population standard deviation, variance, mean and standard error from any list of numbers.
• Permutation & Combination CalculatorCalculate nPr (ordered arrangements) and nCr (unordered selections) with factorials, for probability and combinatorics.
• Probability CalculatorCompute probability of two events: union (A or B), intersection (A and B), conditional probability, and odds.
• Z-Score CalculatorStandardize any raw score by finding how many standard deviations it sits from the mean.
• Confidence Interval CalculatorCompute the confidence interval for a sample mean — enter the mean, standard deviation, and sample size to get the lower and upper bounds.
• Margin of Error CalculatorFind the margin of error for a survey or poll from the sample size and observed proportion, at 90, 95, or 99 percent confidence.
• Sample Size CalculatorWork out how many responses you need for a desired margin of error and confidence level — with optional finite population correction.
• Standard Error CalculatorCompute the standard error of a sample mean or a sample proportion from the standard deviation and sample size.
• Coefficient of Variation CalculatorCompare spread between datasets measured in different units — CV divides standard deviation by the mean so you can judge relative variability at a glance.