Statistics calculators
Z-scores, distributions, confidence intervals, correlation and regression. Free, instant and with the working shown.
All 10 tools
- Z-Score CalculatorFind how many standard deviations a value is from the mean, with percentile.
- Normal Distribution CalculatorFind probabilities for a normal distribution.
- Binomial Distribution CalculatorFind the probability of exactly or at most k successes in n trials.
- Confidence Interval CalculatorFind the confidence interval for a mean from the sample mean, standard deviation and size.
- Sample Size CalculatorFind how many survey responses you need for a chosen margin of error.
- Correlation CalculatorCalculate Pearson's correlation coefficient between two sets of values.
- Linear Regression CalculatorFit a least-squares line to data and predict values.
- Quartile and IQR CalculatorFind quartiles, the interquartile range and outliers.
- Coefficient of Variation CalculatorCompare variability between datasets of different scale.
- Probability CalculatorFind P(A or B), conditional probabilities and independence.