Statistics Calculator
Count, mean, median, mode, and stdev from a list.
Paste numbers to see statistics.
Statistics Calculator turns a pasted list of numbers into count, sum, mean, median, mode, minimum, maximum, and sample standard deviation. Paste values separated by commas or newlines and see every statistic update instantly in your browser.
How it works
Paste or type numbers separated by commas, newlines, or both. The tool parses each value, sorts a copy for median and range, tallies frequencies for the mode, and computes the sample standard deviation using Bessel's correction (n − 1).
Benefits
- Computes eight core statistics in one pass
- Accepts comma- or newline-separated numbers
- Handles ties and multiple modes correctly
- Calculates entirely client-side with no upload
Use cases
- Summarize survey results or test scores quickly
- Check spreadsheet formulas against an independent calculation
- Explore a small dataset before deeper analysis
- Verify statistics homework by hand-checking results
Best practices
- Remove non-numeric labels before pasting a column of data
- Use sample standard deviation for a subset, not a full population
- Check for duplicate entries if the mode result looks unexpected
- Paste larger datasets on separate lines for easier review
Common mistakes
- Pasting a header row along with the numeric values
- Expecting a mode when every value is unique
- Confusing sample standard deviation with population standard deviation
- Leaving in currency symbols or thousands separators that break parsing
Privacy
Pasted numbers are parsed and analyzed entirely in your browser. Statistics Calculator does not upload or store your dataset on any server.
Frequently asked questions
- What number formats can I paste in?
- Separate numbers with commas, newlines, or both. Extra whitespace is ignored, so you can paste directly from a spreadsheet column or a comma-separated line.
- How is the median calculated for an even number of values?
- The values are sorted, and for an even count the median is the average of the two middle numbers. For an odd count, it is the single middle value.
- What does mode show when there is a tie?
- If multiple values share the highest frequency, all of them are listed as modes. If every value appears exactly once, the tool reports no mode.
- Why does standard deviation use n − 1 instead of n?
- This calculator reports the sample standard deviation, which divides by n − 1 (Bessel's correction) to better estimate the variability of a population from a sample.
- What happens with only one number?
- Sample standard deviation is undefined for a single value, since there is no variation to measure, so the tool shows "n/a" for that field.
- Is my data uploaded when I paste numbers?
- No. Parsing and all statistics are computed locally in your browser using plain JavaScript arithmetic.
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