Statistics Calculator
Calculate mean, median, mode, range, variance, and standard deviation from a list of numbers.
How to Use
- Enter your numbers in the text box, separated by commas, spaces, or one per line.
- Results update automatically as you type.
- The summary shows count, sum, mean, median, mode, and range.
- Variance and standard deviation are shown for both population and sample formulas — use sample if your data is a subset of a larger population.
When to Use This
- Summarizing a short column pasted out of a spreadsheet, when opening a statistics package for seven numbers is not worth the trouble.
- Deciding whether to report a mean or a median, since seeing both next to the range exposes a set that is skewed.
- Checking homework on population versus sample standard deviation, where both figures are produced side by side from the same list.
- Spotting a typo in a pasted data set, because the notice above the results names any token that failed to parse.
Frequently Asked Questions
About This Calculator
Mean, median and mode answer the same question in three ways and disagree whenever data is skewed. Spread is measured by variance, the average squared distance from the mean, and by standard deviation, its square root. The population form divides by N; the sample form divides by N minus 1, Bessel's correction, which inflates the estimate to account for the mean itself having been estimated from the same data.
Paste numbers separated by spaces, commas, semicolons or line breaks. Any token that does not parse as a number is skipped and named in a notice above the results. The tool reports count, sum, mean, median with the two middle values averaged on even counts, every tied mode or none when nothing repeats, and the minimum, maximum and range. Variance and standard deviation appear in both forms once two values are present, rounded to four decimals.
Notes & Limits
- The parser splits on commas, so a number typed with thousands separators, such as 1,234, is read as two separate values, 1 and 234.
- Variance and standard deviation need at least two values; with a single number entered, the spread section stays hidden entirely.
- Quartiles, interquartile range, percentiles, skewness, correlation and outlier detection are not computed. A statistics package is the right tool for those.
- Every figure is displayed rounded to four decimal places, so copying a mean out of here loses precision on data with long decimals.