Statistics Calculators
20 free tools for data analysis. From basic mean and standard deviation to complex hypothesis testing.
Basics & Means
x̄
Sample Mean Calculator
Calculate the arithmetic average and standard error.
Calculate
ⁿ√x
Geometric Mean Calculator
Compute the multiplicative average for growth rates.
Calculate
x̄w
Weighted Mean Calculator
Calculate average when values have different weights.
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%E
Percent Error Calculator
Determine the accuracy of an estimated value.
Calculate
%Y
Percent Yield Calculator
Calculate the efficiency of a chemical reaction.
Calculate
n!
Factorial Calculator
Compute permutations and factorial values.
Calculate
Variation & Spread
Q3
IQR Calculator
Find the Interquartile Range to measure spread.
Calculate
σ²
Population Variance Calculator
Calculate variance and standard deviation of data.
Calculate
CV
Coefficient of Variation
Measure relative variability of a dataset.
Calculate
|x|
MAD Calculator
Compute the Mean Absolute Deviation.
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⚠️
Outlier Calculator
Identify outliers using the 1.5×IQR rule.
Calculate
5#
Five Number Summary
Find Min, Q1, Median, Q3, and Max values.
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📊
Frequency Distribution
Group raw data into frequency bins/histograms.
Calculate
Probability & Tests
Z
Normal Distribution Calculator
Find probability area under the Bell Curve.
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t
T-Distribution Calculator
Calculate critical values for Student's t-distribution.
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p
P-Value Calculator
Determine statistical significance from test statistics.
Calculate
F
Fisher’s Exact Test
Test associations in 2x2 contingency tables.
Calculate
CI
Confidence Interval Calculator
Estimate the range for population parameters.
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P|B
Bayes Theorem Calculator
Calculate conditional probability P(A|B).
Calculate
r
Pearson Correlation
Measure the strength of linear relationship (r).
Calculate