Statistics Calculator
Mean, median, mode, standard deviation, quartiles and outliers from a list.
Every Summary Statistic From One List Of Numbers
Paste or type a list of numbers — from a spreadsheet column, a lab notebook or a homework question — and every common descriptive statistic appears at once: the three averages, the spread, the quartiles and any outliers, with a histogram to show the shape of the data.
The choices that change the answers are explicit. Sample or population decides whether variance divides by n − 1 or n, and there are two quartile methods because textbooks and spreadsheets genuinely disagree. The calculation uses a two-pass algorithm, so large values close together do not lose precision.
Key features
- Mean, median and mode — including several tied modes, or none.
- Sample or population — variance, standard deviation and standard error.
- Quartiles and IQR — spreadsheet or textbook method.
- Outlier detection — the 1.5 × IQR rule.
- Histogram, geometric and harmonic means — and the coefficient of variation.
This tool runs entirely inside your browser using native Web APIs. Your files and text are never uploaded to a server, never logged and never shared with third parties.
How to use: Statistics Calculator
- Enter your numbers
Separated by spaces, commas, semicolons or new lines. - Say what they are
A sample of a larger group, or the entire population. - Pick a quartile method
Match your spreadsheet or your textbook. - Read the results
The summary, the full table and the histogram update as you type.
Technical specifications
| Processing location | Entirely in your browser — no server round trip |
|---|---|
| Data uploaded | None. Files and text never leave your device |
| Price | Free — no account, no trial, no usage cap |
| Category | Calculators |
| Works offline | Yes, once the page has loaded |
| Browser support | Chrome 90+, Edge 90+, Firefox 90+, Safari 15+ |
| Interface languages | English, 中文, हिन्दी, Español, العربية |
Frequently asked questions
Sample or population standard deviation?
Use sample when your numbers are part of a larger group you want to describe — survey responses, measurements, test scores from one class. Use population only when you have every member of the group. Sample standard deviation divides by n − 1, which corrects for a sample tending to look less spread out than the whole.
Why are my quartiles different from my calculator’s?
There are several accepted methods. Spreadsheets such as Excel and Google Sheets interpolate between values; many textbooks and graphing calculators take the median of each half. Choose the one that matches where the question came from.
What counts as an outlier?
Any value more than 1.5 interquartile ranges below the first quartile or above the third — Tukey’s rule, the one used in box plots. It is a flag for checking, not proof that a value is wrong.
What if there is no mode?
If every value appears once, there is no mode, and that is shown. If several values tie for most frequent, all of them are modes.
Can I paste a column from Excel?
Yes. Copied cells arrive as one number per line, which works directly. Write thousands without separators, because a comma is treated as a separator between numbers.