Statistics Calculator
Mean, median, mode, standard deviation, and more
About Statistics Calculator
Statistics Calculator describes a list of numbers with 23 values: count, sum, the arithmetic, geometric, and harmonic means, median, mode, range, sample and population standard deviation and variance, Q1, Q3, and the interquartile range by the inclusive or exclusive method, standard error, coefficient of variation, Excel-style skewness and excess kurtosis, sum of squares, outliers by the 1.5 × IQR rule, minimum, and maximum. Separate the numbers with commas, spaces, tabs, semicolons, or new lines. Results show 12 significant digits, and an entry that is not a number stops the calculation with a message naming it.
Example
A list of eight numbers and part of the grid the page shows (the page's own statistics code, run in Node on October 6, 2026).
Numbers (Quartile method: Inclusive)
2, 4, 4, 4, 5, 5, 7, 9
Some of the results
Mean 5 · Median 4.5 · Mode 4 (×3) Sample std dev (s) 2.1380899353 Population std dev (σ) 2 Q1 4 · Q3 5.5 · IQR 1.5 (Exclusive: Q1 4, Q3 6.5) Coefficient of variation 42.761798706% Skewness 0.818487553357 · Excess kurtosis 0.940625 Outliers 9
How to calculate mean, median, and standard deviation
- 1Paste or type the numbers, separated by commas, spaces, tabs, semicolons, or new lines, with a dot for decimals.
- 2Leave "Quartile method" on the inclusive option, as in Excel QUARTILE.INC, or pick the exclusive one used by Minitab and SPSS.
- 3Click "Calculate" and read the grid; changing the quartile method afterward recalculates at once.
- 4If the page lists entries after "Not a number", correct them and click "Calculate" again.
Formats and limits
- Separators
- Commas, spaces, tabs, semicolons, and new lines; a dot for decimals
- Statistics
- 23 values, from count and sum to skewness, kurtosis, and outliers
- Quartiles
- Inclusive (Excel QUARTILE.INC) or Exclusive (Excel QUARTILE.EXC, Minitab, SPSS); exclusive quartiles need enough values
- Undefined values
- Shown as —; the reason is written for the geometric and harmonic means, the quartiles, skewness, and kurtosis
- Entries that are not numbers
- The list is refused and the first five such entries are named
Where your numbers are processed
Every statistic is computed in your browser, and your numbers are not uploaded. If some entries are not numbers, the error message that names up to five of them is sent, cleaned, to our error log with the tool's name and your browser's name and major version; the valid numbers are never part of it.
Frequently asked questions
Does it give both sample and population standard deviation?
Yes. The sample value s divides by n − 1 and estimates a larger population from your sample; the population value σ divides by n and describes exactly the numbers you entered. With a single number, s and the sample variance show —.
Can I match the quartiles of Excel?
Yes. Inclusive, the default, follows QUARTILE.INC and calculator.net; Exclusive follows QUARTILE.EXC, Minitab, and SPSS. For 2, 4, 4, 4, 5, 5, 7, 9, Q3 is 5.5 with the inclusive method and 6.5 with the exclusive one. With too few values the exclusive quartiles are undefined, and the page says so.
How are outliers found?
1.5 × IQR beyond the quartiles: a value below Q1 − 1.5 × IQR or above Q3 + 1.5 × IQR is listed. In 2, 4, 4, 4, 5, 5, 7, 9 that flags 9. Because the IQR comes from the quartiles, the list can change with the quartile method.
What if no value repeats?
No mode is given: the Mode cell reads None (no value repeats). When several values tie for the most repeats, all of them are listed, followed by how many times each one appears in your list.
Can I paste numbers with thousands separators?
No. A comma separates values, so 1,000 is read as two numbers, 1 and 0, and 2,5 as 2 and 5. Remove thousands separators and write decimals with a dot before you calculate.
Tips and tricks
- ✓Paste a spreadsheet column as it is: the line breaks between cells already separate the values.