Free Statistics Calculators
Describe a data set in seconds. Find its centre, its spread and the chance of an outcome. Each statistics calculator runs in your browser and needs no signup.
Last updated: November 2026
Descriptive Statistics Calculators
Descriptive statistics summarise a list of numbers with a few figures: where the values centre and how widely they spread. Paste your data into any of these calculators to get the results straight away.
Mean, Median and Mode Calculator
Find the mean, median, mode and midrange of any data set, with the sorted data.
Variance Calculator
Sample or population variance with standard deviation and a deviation table.
Standard Deviation Calculator
Calculate population and sample standard deviation and variance for any data set.
IQR Calculator
Find Q1, Q3, the interquartile range and outliers for any data set.
Statistics Calculator
Run a full statistical analysis of a data set: mean, median, mode, range and quartiles in one place.
Probability Calculators
Probability measures how likely an outcome is, on a scale from 0 (impossible) to 1 (certain).
Which Statistics Calculator Should I Use?
| If you want to… | Use |
|---|---|
| Find the average, the middle value or the most common value | Mean, Median and Mode Calculator |
| Measure how spread out values are around the mean | Variance Calculator or Standard Deviation Calculator |
| Measure the spread of the middle half of the data, without being thrown off by extremes | IQR Calculator |
| Get several summary measures of one data set at once | Statistics Calculator |
| Work out the chance of an event, or count combinations and permutations | Probability Calculator |
Centre and Spread: The Two Questions Statistics Answers First
Where is the centre?
The mean adds the values and divides by how many there are. The median is the middle value once the data is sorted. The mode is the value that appears most often. A few extreme values pull the mean towards them but barely move the median, so the two together say more than either alone.
How spread out is it?
Variance and standard deviation measure spread around the mean, and the standard deviation is the square root of the variance, so it is in the same units as the data. The interquartile range measures the distance between the 25th and 75th percentiles, so it ignores the extremes.
Sample or population?
Use the population formulas when your numbers are every member of the group you care about, and the sample formulas when they are a subset used to estimate a larger group. The sample versions divide by n − 1 instead of n, so the results differ slightly, and the difference matters most for small data sets.
Frequently Asked Questions
What statistics calculators are available?
There are six statistics calculators: Variance, Mean, Median and Mode, IQR, Standard Deviation, Statistics and Probability. Paste a list of numbers into the data calculators to get the results straight away.
Are these statistics calculators free?
Yes. Every calculator is free to use as often as you like, with no signup and no download.
Is my data stored or sent anywhere?
No. All calculations run in your browser. The numbers you enter are not sent to a server, stored or shared.
What is the difference between a sample and a population?
A population is every member of the group you want to describe, and a sample is a subset of it. When you only have a sample, the variance and standard deviation are calculated by dividing by n − 1 instead of n, which corrects for the fact that a sample tends to understate the spread of the whole population.
Which calculator should I use to describe a data set?
Start with the Mean, Median and Mode Calculator for the centre of the data, then use the Variance, Standard Deviation or IQR calculator to see how spread out the values are. The Statistics Calculator gives several of these measures at once.
Can I paste numbers from a spreadsheet?
Yes. The data calculators accept values separated by commas, spaces or new lines, so a column copied from a spreadsheet works. Check each calculator's instructions for the exact formats it accepts.
Last reviewed: November 2026 — formulas and worked examples verified.