Statistics
Z-scores, percentiles, quartiles, confidence intervals, sample size, probability, combinations and regression.
15 tools
- Z-Score CalculatorTurn a value into a z-score (standard score) and find the share of a normal distribution below and above it.
- Percentile CalculatorFind the value at any percentile of a data set, and the percentile rank of a value.
- Quartile & Five-Number Summary CalculatorGet the quartiles, interquartile range (IQR), five-number summary and outliers of a data set.
- Confidence Interval CalculatorFind the confidence interval for a mean from the sample mean, standard deviation and sample size.
- Sample Size CalculatorFind how many people to survey (or measurements to take) for a chosen margin of error and confidence level.
- Margin of Error CalculatorFind the margin of error of a survey result or a sample mean at a chosen confidence level.
- Probability CalculatorCombine the probabilities of two events: both, either, neither, exactly one, and not A.
- Odds to Probability CalculatorConvert odds (for or against) to a probability, or a probability to odds.
- Combinations Calculator (nCr)Count the ways to choose r items from n when order doesn't matter — with or without repetition, exactly.
- Permutations Calculator (nPr)Count the ordered arrangements of r items taken from n — with or without repetition, exactly.
- Normal Distribution CalculatorFind the probability that a normally distributed value falls below, above, between or outside given values.
- Binomial Probability CalculatorFind the probability of exactly, at most or at least k successes in n independent trials.
- Coefficient of Variation CalculatorMeasure relative spread: the standard deviation as a percentage of the mean, for a sample or a population.
- Correlation & Linear Regression CalculatorFit a least-squares line to paired data and get the correlation coefficient r, R² and predictions.