Statistics Calculator
Paste a list of numbers and get count, sum, mean, median, mode, range, quartiles, IQR, variance, and standard deviation. Calculates in your browser.
Show the math
Descriptive statistics summarize a list of numbers:
mean = Σx ÷ n
s = √(Σ(x − mean)² ÷ (n − 1))
Quartiles are the medians of the lower and upper halves, leaving the median out of both halves when the count is odd (the TI-83/84 method); the sample standard deviation divides by n − 1. All math runs in your browser.
What this does
A statistics calculator takes a list of numbers and returns count, sum, mean, median, mode, range, quartiles, IQR, variance, and standard deviation.
How to use it
- Paste or type your numbers.
- Separate them with commas or spaces.
- Read the full summary as you type.
- Use the median and IQR when outliers skew the mean.
How it works
It reports sample statistics, dividing variance by n − 1, and finds quartiles as the medians of the lower and upper halves, leaving the median out of both halves when the count is odd (the TI-83/84 method).
mean = sum ÷ count; sample SD divides by n − 1
Understanding your result
Read the spread alongside the average, because the mean alone hides the story: a small standard deviation means the data clusters tightly, a large one means it scatters. The median resists outliers while the mean does not, so a big gap between them signals skew. These are sample statistics (dividing by n minus 1), the right choice when your data is a sample of something larger.
Example
For 2, 4, 4, 6 the mean is 4 and the sample SD is about 1.63.
Last updated .
Frequently asked questions
What summary measures are shown?
Count, sum, mean, median, mode, min/max range, quartiles (Q1, Q3, IQR), and sample variance and standard deviation.
Is this sample or population standard deviation?
It reports the sample statistics, dividing by n − 1. Quartiles are the medians of the lower and upper halves, with the median left out of both halves when the count is odd (the TI-83/84 method).
Is my data stored?
No. Everything is calculated locally in your browser.
Related tools
Permutation & Combination Calculator
Calculate permutations (nPr) and combinations (nCr) for choosing r items from n. Calculates in your browser.
Z-Score Calculator
Find the z-score (standard score) of a value — how many standard deviations it sits above or below the mean. Calculates in your browser.
Confidence Interval Calculator
Find the confidence interval for a mean from the sample mean, standard deviation, sample size, and confidence level. Calculates in your browser.
Sample Size Calculator
Find the sample size needed to estimate a proportion to within a margin of error at a chosen confidence level, with a population correction. Calculates in your browser.