How to calculate statistics for a list of numbers
- Paste or type your numbers into the box. A column from a spreadsheet works.
- Read the count, sum, mean, median, mode, range, spread, and quartiles as soon as you type.
- Check the outliers and the histogram to see how the values are distributed.
- Use the copy button next to any result to put it on your clipboard.
Both the sample and the population forms of variance and standard deviation are shown, so you can pick the one that matches your data. Try the example to see an outlier in action.
Questions
Is my data uploaded?
No. The numbers are processed in your browser and never leave your device. Nothing is saved or tracked.
What is the difference between sample and population standard deviation?
Use the population version (divide by n) when your numbers are the whole group you care about. Use the sample version (divide by n − 1) when they are a sample drawn from a bigger group, which is the usual case in surveys and experiments. The sample value is a little larger because it corrects for the sample being smaller than the group.
How are the quartiles calculated?
The numbers are sorted and split into a lower and an upper half. Q1 is the median of the lower half and Q3 is the median of the upper half. With an odd count the middle number is left out of both halves. Other tools use different methods, so small differences are normal.
How are outliers found?
A value is flagged when it lies more than 1.5 times the interquartile range (IQR) below Q1 or above Q3. This is the same rule box plots use. A flagged number is not necessarily wrong, it is just unusual compared with the rest.
What separators and formats can I paste?
Separate numbers with spaces, commas, semicolons, or new lines, so a column pasted from a spreadsheet works. Use a dot for decimals, such as 3.5. Anything that is not a number is skipped and listed so you can fix it.
Credits
Built by OneTooling using standard browser features. No third-party code runs on your data.