Welcome to my collection of free online statistical calculators. These easy-to-use statistics tools help you solve problems quickly and accurately. You’ll find calculators for descriptive statistics, probability, and hypothesis testing, along with specialized probability calculators for the normal, binomial, and Poisson distributions.
Perfect for students, researchers, and professionals, this set of online statistics tools gives you fast, reliable results whenever you work with data.
Descriptive Statistics
These calculators help you summarize and describe data. You can measure averages, variation, and spread. Other options let you find percentiles, percent change, percent error, and apply the empirical rule.
- Mean, Median, and Mode Calculator
- Weighted Average Calculator
- Variance Calculator
- Standard Deviation Calculator
- Mean Absolute Deviation (MAD) Calculator
- Median Absolute Deviation (MADM) Calculator
- Outlier Calculator
- Standard Error Calculator
- Percentile and Quartile Calculator
- Percentage Calculator
- Percent Change Calculator
- Percent Error Calculator
Statistical Inference
These calculators help you make conclusions about populations by using samples. Perform hypothesis tests, construct confidence intervals, and find critical values. Tools for correlation and linear regression let you examine relationships and predict outcomes.
Probability Distributions
These calculators let you work with common probability models. Each tool shows probabilities, values, and graphs based on the inputs you provide.
- Normal Distribution Calculator
- Normality Test Calculator
- Z Score Calculator (Find scores and probabilities)
- Empirical Rule Calculator
- Binomial Distribution Calculator
- Poisson Distribution Calculator
- Negative Binomial Distribution Calculator
- Geometric Distribution Calculator
- Hypergeometric Calculator
Counting and Combinatorics
These calculators handle the math of counting possibilities. Use them to find the number of ways events can occur to find probabilities.
