Mean, median, standard deviation, z-score, and probability tools. Browse our free statistics tools below — all calculators are instant, accurate, and require no sign-up.
Geometric Mean Calculator — Calculate the geometric mean of positive numbers. Ideal for growth rates, returns, and ratios. Free online geometric mean calculator.
Mean Calculator — Calculate the arithmetic mean (average) of a data set. Enter comma-separated numbers and get the mean instantly. Free online average calculator.
Median Calculator — Find the median of any data set. Enter comma-separated numbers to get the middle value. Free online median calculator for statistics.
Mode Calculator — Find the mode of a data set — the most frequently occurring value. Detects unimodal, bimodal, and multimodal data. Free online mode calculator.
Probability Calculator — Calculate basic probability for single and combined events. Compute AND, OR, NOT probabilities and conditional probability. Free online probability calculator.
Percentile Calculator — Calculate percentiles and percentile ranks of a data set. Find the value at any percentile or the percentile of any value. Free online percentile calculator.
Range Calculator — Calculate the range of a data set — the difference between the maximum and minimum values. Free online range calculator for statistics.
Standard Deviation Calculator — Calculate the standard deviation of a data set. Supports both population and sample standard deviation. Free online statistics calculator.
Variance Calculator — Calculate the variance of a data set. Supports both population and sample variance. Understand data dispersion with this free online calculator.
Weighted Average Calculator — Calculate the weighted average of values with different weights or importance levels. GPA, portfolio returns, and more. Free online weighted mean calculator.
Z-Score Calculator — Calculate the z-score (standard score) of a data point. Convert between raw scores, z-scores, and percentiles. Free online z-score calculator.