Statistics Calculator
Paste a list of numbers and instantly get mean, median, mode, range, variance, standard deviation, quartiles and more. Free and private — your data never leaves your browser.
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How to use the statistics calculator
- Enter your data set. Paste or type your numbers separated by commas, spaces, semicolons or line breaks — straight from a spreadsheet column works fine.
- Read the results instantly. Every statistic — mean, median, mode, range, variance, standard deviation, quartiles, IQR and standard error — updates live as you edit the data.
- Copy or download the report. Grab the sorted data or the full statistics summary with one click for your homework, report or paper.
About this tool
This free statistics calculator computes all the standard descriptive statistics for a data set: measures of central tendency (arithmetic mean, median and mode), measures of spread (range, interquartile range, variance and standard deviation — both sample and population versions), plus the quartiles Q1 and Q3, midrange, standard error of the mean and coefficient of variation. It is handy for statistics homework, lab reports, quality-control checks, survey analysis and quick sanity checks on spreadsheet data without setting up formulas.
Everything is calculated locally in your browser the moment you type — your numbers are never uploaded, stored or logged, so confidential measurements and grades stay private. If you only need the mean, the simpler average calculator may be quicker; for probability counting problems see the combinations and permutations calculator.
Frequently asked questions
What is the difference between sample and population standard deviation?
Population standard deviation divides the sum of squared deviations by n and describes a complete population. Sample standard deviation divides by n − 1 (Bessel's correction) to give an unbiased estimate when your data is only a sample of a larger population. If you measured everyone or everything of interest, use the population version; otherwise use the sample version.
How are the quartiles calculated?
This tool uses the common median-split (exclusive) method taught in most courses: the data is sorted, Q1 is the median of the lower half and Q3 the median of the upper half, excluding the overall median itself when the count is odd. Other software (like Excel's QUARTILE.INC) interpolates differently, so small differences between tools are normal.
What if my data has no mode?
When every value occurs the same number of times (for example, each value appears exactly once), the data set has no mode and the tool reports "No mode". If several values tie for the highest frequency, all of them are listed — the data set is bimodal or multimodal.
What number formats are accepted?
Plain integers, decimals with a dot (3.5), negative numbers (-2) and scientific notation (1.2e3) all work. Note that the comma is treated as a separator between numbers, so write one and a half as 1.5, not 1,5. Invalid entries are skipped and reported so you can spot typos.