Standard Deviation Calculator
Sample and population standard deviation, variance and mean of a list.
Statistics Calculators
Calculators for describing data and working with probability — standard deviation, z-scores, percentiles, combinations and random numbers — with each formula and step explained.
Descriptive statistics
Percentile Calculator
Value at the Pth percentile, or the percentile rank of a value.
Distributions
Z-Score Calculator
Z-score from a value, mean and standard deviation, with percentile.
Probability & combinatorics
Probability Calculator
And, or, not and at-least-once probabilities for independent events.
Combination Calculator
Exact nCr and nPr, with or without repetition, for n up to 1,000.
Random generators
Random Number Generator
Random whole numbers or decimals in any range, with or without repeats.
No calculators match that filter. Try the site search or browse all tools.