Statistics calculators
Averages, spread, odds, sample sizes and significance. 22 in this section.
- Mean, Median, Mode CalculatorFind the mean, median, mode and range of a list of numbers, plus count, sum, min and max.
- Standard Deviation CalculatorSample or population standard deviation and variance, with a step-by-step table of deviations.
- Z-Score CalculatorConvert a value to a z-score and see its percentile and the share of a normal distribution above and below it.
- Probability CalculatorProbability of A and B, A or B, not A, neither, and exactly one, for independent or mutually exclusive events.
- Permutation CalculatorNumber of ordered arrangements of r items chosen from n, with or without repetition (nPr).
- Combination CalculatorNumber of ways to choose r items from n when order does not matter (nCr), with or without repetition.
- Sample Size CalculatorHow many survey responses you need for a given confidence level and margin of error, with optional population size.
- Margin of Error CalculatorMargin of error for a survey or poll from the sample size, proportion and confidence level.
- Confidence Interval CalculatorConfidence interval for a mean from the sample mean, standard deviation and size, using the t-distribution.
- Percentile CalculatorFind the percentile rank of a value in a list, or the value at any percentile.
- Correlation Coefficient CalculatorPearson correlation coefficient r and r² between two lists of paired numbers.
- Linear Regression CalculatorLeast-squares line of best fit, slope, intercept and R² from two lists, with a prediction for any x.
- Expected Value CalculatorExpected value, variance and standard deviation of a discrete outcome from value and probability pairs.
- Odds ConverterConvert between fractional, decimal and American (moneyline) odds and implied probability.
- Dice Probability CalculatorProbability of rolling a given sum (exactly, at least or at most) with any number of dice and sides.
- Binomial Probability CalculatorProbability of exactly, at most or at least k successes in n independent trials, with the full distribution.
- Normal Distribution CalculatorProbability that a normally distributed value falls below, above or between given values.
- Weighted Average CalculatorWeighted mean from value and weight pairs, such as grades with category weights or prices with quantities.
- Geometric Mean CalculatorGeometric mean of positive numbers, or the average growth rate from a series of percent returns.
- Five-Number Summary CalculatorMinimum, Q1, median, Q3 and maximum, plus the interquartile range and outliers by the 1.5 × IQR rule.
- A/B Test Significance CalculatorIs the difference in conversion rate between two variants statistically significant? Two-proportion z-test.
- Coin Flip Probability CalculatorChance of at least k heads in n flips, or of a streak of k heads in a row, for a fair or biased coin.