Statistics calculator. The full picture from pasted numbers.

How to use the Statistics Calculator

This calculator gives a descriptive summary of a list of numbers: mean, median, mode, range, variance, standard deviation and quartiles. It reads every number in the box, sorts a copy, and draws a histogram and a box-plot from the same data. It is handy for homework, survey answers, test scores or a column copied from a spreadsheet.

Step by step

1. 1
   Enter your numbers

   Paste or type into Your numbers. Commas, spaces, tabs, semicolons and new lines all work as separators, and negative and decimal values are fine. Press Load sample to try a set of 20 values.

2. 2
   Check the count

   The line under the box shows how many values were read. If some items were not numbers, an amber note says how many were skipped.

3. 3
   Read the Summary cards

   Mean and Median sit in the highlighted cards, followed by Mode, Count, Sum, Minimum, Maximum, Range, sample and population standard deviation and variance, Q1, Q2, Q3 and IQR. Hover the small info icon on a card, where there is one, for its definition.

4. 4
   Adjust the histogram

   Leave Auto ticked to let Sturges' rule pick the number of bins, or drag the Bins slider anywhere from 3 to 30. Moving the slider unticks Auto.

5. 5
   Tidy and copy

   Sort ascending rewrites the box as a sorted, comma separated list, and Clear empties it. Copy results copies the full summary as plain text.

Reading the result

• With the sample data the mean is 22.95, the median is 22, and the mode shows 22 and 23, each appearing 4 times.
• Std dev sample divides by N minus 1 and suits data drawn from a larger group; Std dev pop. divides by N and suits a complete set. For the sample they are about 4.77 and 4.65.
• Quartiles use linear interpolation, the same method as Excel's PERCENTILE.INC. The sample gives Q1 20.75, Q3 23.25 and an IQR of 2.5.
• On the box-plot, a value more than 1.5 × IQR beyond the box is drawn as an amber outlier dot. In the sample, 41 is the one outlier, and the whisker labels read min 18 and max 27 because the whiskers stop at the last value inside that limit.
• Mode shows no repeats when every value appears once. With more than four modes it shows the first one and a count of the rest.

Tips and common mistakes

• Do not use thousands separators or decimal commas. A comma always splits numbers, so 1,250 is read as 1 and 250, and 3,5 as 3 and 5.
• Anything that is not a digit, a decimal point, a plus or minus sign or the letter e is treated as a separator, so $12 and 12% both count as 12.
• Scientific notation works, so 1.5e3 is read as 1500.
• Sort ascending drops anything that was skipped, so keep a copy of the original text if you need it.
• Report the sample standard deviation when your numbers are a sample of something larger, and the population one when you have every value, such as every order last month.

Privacy and limits

All calculations and charts run in your browser. Your numbers are not sent anywhere and are not saved, so they are gone when you close or reload the tab. Copy results writes only to your clipboard.

Back to the tool

Everything a stats summary should show.

• Compute descriptive statistics instantly: mean, median, mode, range, sum and count from any list of numbers.
• Get both population and sample standard deviation and variance, Bessel's correction included.
• Explore quartiles and IQR: Q1, Q2, Q3 and interquartile range using linear interpolation, the same method as Excel and NumPy defaults.
• Visualise your data with a live, auto-binned histogram you can adjust with a slider (3-30 bins).
• Spot outliers on a box-plot drawn with the 1.5×IQR whisker rule.
• Copy the full summary as plain text, or sort and clear your data with one click.

Frequently asked questions.

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