Statistics Calculator Online
Compute the full descriptive statistics for any data set — mean, median, mode, standard deviation, quartiles and more — right in your browser.
Your data set is parsed and summarized entirely on your device — nothing is uploaded, and nothing is stored once you close the tab.
Open the Standard Deviation Calculator
About Statistics Calculator
Statistics Calculator computes the full descriptive-statistics summary for any list of numbers in one pass. Paste or type a data set and it instantly returns the count, sum, mean, median, mode, minimum, maximum, range, quartiles, interquartile range, population and sample standard deviation, variance and skewness. The five-number summary (min, Q1, median, Q3, max) is broken out on its own so you can read it at a glance or copy the full breakdown as plain text for a report. It is useful for students checking homework, analysts doing a quick sanity check on a sample, and anyone summarizing survey or experiment results without opening a spreadsheet. Every figure is computed locally as you type, so your data set never leaves your device.
Features
- Full descriptive statistics: count, sum, mean, median, mode, min, max and range
- Five-number summary (min, Q1, median, Q3, max) shown as its own row
- Quartiles (Q1, Q3) and interquartile range (IQR) via the standard exclusive-median method
- Both population and sample standard deviation, plus sample variance
- Skewness so you can see at a glance whether the data leans left or right
- Multi-mode detection — lists every value tied for the highest frequency
- Accepts numbers separated by commas, spaces, semicolons or newlines
- One-click copy of the entire statistics breakdown as plain text
How to use the Statistics Calculator
- Paste or type your numbers into the data set field, separated by commas, spaces or newlines
- Read the five-number summary and full breakdown as they update instantly
- Copy the full statistics summary as plain text with the copy button
Example
Input
1..9
Output
Mean 5 · Median 5 · Q1 2.5 · Q3 7.5
Nine values (1 through 9): mean and median both land on 5, with Q1 and Q3 forming the interquartile range.
Common errors & troubleshooting
- The result shows 'Enter at least one number' even though text was pasted. — The Statistics Calculator only keeps tokens it can parse as numbers — remove labels, units or stray words so each entry is a plain number.
- Sample standard deviation shows no value for a single number. — Sample standard deviation needs at least two values (it divides by n − 1); with one value only the population standard deviation of 0 is meaningful.
- Mode shows 'None' even though a value looks repeated. — Check for extra decimal places or trailing spaces — '4' and '4.0' both parse to the same number, but a typo like '4,0' in some locales can split into two separate values.
- Quartile values look different from another tool's output. — Several valid quartile methods exist. This calculator uses the exclusive-median (Tukey's hinges) method, which can differ slightly from linear-interpolation methods on small data sets.
Frequently asked questions
- What does the Statistics Calculator compute?
- It computes the full descriptive-statistics summary for a list of numbers: count, sum, mean, median, mode, min, max, range, quartiles (Q1/Q3), interquartile range, population and sample standard deviation, variance and skewness.
- How does the Statistics Calculator find the quartiles?
- It uses the exclusive-median method: the sorted data is split at the median (excluding the middle value when the count is odd), and Q1 and Q3 are the medians of the lower and upper halves. IQR is simply Q3 minus Q1.
- What is the difference between population and sample standard deviation here?
- Population standard deviation divides the sum of squared deviations by n, treating your data as the entire population. Sample standard deviation divides by n − 1 (Bessel's correction), which is the usual choice when your data is a sample drawn from a larger population.
- Can the Statistics Calculator handle more than one mode?
- Yes. If several values are tied for the highest frequency, all of them are listed as the mode. If every value occurs exactly once, the tool reports no mode rather than guessing.
- Does the Statistics Calculator upload my data set?
- No. Every calculation happens locally in your browser as you type. The numbers you enter are never sent to a server or stored anywhere by ArrayKit.
- What input formats does the Statistics Calculator accept?
- You can separate numbers with commas, spaces, semicolons or newlines, in any combination, including numbers copied straight from a spreadsheet column. Non-numeric tokens are ignored.
Related tools
All ArrayKit tools