Statistics Calculators: Descriptive Statistics, Probability and Inference
Statistics homework is mostly careful arithmetic. These calculators handle descriptive statistics, probability, counting problems and inference so you can check your working and focus on interpreting the result. Enter your data or parameters and get the answer along with the formula used.
9 free statistics calculators
Standard Deviation Calculator
Mean, variance and standard deviation (population or sample) for a list of numbers.
Open calculator →Number Sequence Calculator
Find the nth term and sum of an arithmetic or geometric sequence.
Open calculator →Sample Size Calculator
Required survey sample size for a target confidence level and margin of error.
Open calculator →Probability Calculator
Combine two independent event probabilities — AND, OR, and NOT.
Open calculator →Statistics Calculator
Count, sum, mean, median, mode, range, variance and standard deviation for a list of numbers.
Open calculator →Mean, Median, Mode, Range Calculator
The core descriptive stats for a list of numbers, all in one place.
Open calculator →Permutation and Combination Calculator
Compute nPr (ordered arrangements) and nCr (unordered selections).
Open calculator →Z-score Calculator
Standardize a value against a mean and standard deviation, or convert a z-score back to a raw value.
Open calculator →Confidence Interval Calculator
Margin of error and confidence interval for a sample mean.
Open calculator →Frequently asked questions
Do these calculators show the formula used?
Yes. Each page lists the equations it uses so you can follow the working and cite the method.