Free Statistics Calculator - Mean, Median, Mode & More

Calculate mean, median, mode, standard deviation, variance and quartiles from any data set. Free online statistics tool.

What Is Statistics Calculator?

Descriptive statistics summarise a dataset into key numbers that describe its central tendency, spread and shape. The mean tells you the average, the median tells you the middle value (less affected by outliers), the mode identifies the most frequent value, and standard deviation measures how spread out the values are.

Understanding these statistics is fundamental to data analysis, scientific research, business reporting and academic work. This calculator processes a list of numbers and produces a comprehensive statistical summary instantly, including values that would be tedious to calculate by hand — variance, range, quartiles, interquartile range and count.

How to Use This Tool

  1. Enter your numbers separated by commas, spaces or new lines.
  2. The statistics are calculated instantly: mean, median, mode, standard deviation and more.
  3. View the full breakdown including range, variance, quartiles and count.
  4. Sort the values or remove outliers to see how they affect the results.
  5. Copy the summary for use in reports or academic papers.

Tips & Best Practices

  • Use the median instead of the mean when your data has extreme outliers — the median is not pulled by extreme values.
  • A high standard deviation indicates data is spread out; a low one means values cluster around the mean.
  • The interquartile range (Q3 – Q1) is a robust measure of spread that ignores the most extreme 25% at each end.
  • For small datasets, be cautious about drawing strong conclusions — statistical significance generally requires larger samples.

Common Use Cases

  • Analysing survey results, test scores or experimental data.
  • Generating statistical summaries for academic papers and research reports.
  • Checking data quality by examining spread, outliers and distribution shape.
  • Comparing datasets by their statistical properties.

Frequently Asked Questions

What statistics does this calculate?

Count, sum, mean, median, mode, min, max, range, and standard deviation. Premium adds variance, Q1, Q3, and IQR.