Statistics Calculator
Mean, median, mode, standard deviation & more · free, no signup
Free Statistics Calculator — Mean, Median, Mode and Standard Deviation
This statistics calculator summarises a list of numbers in one click. Paste or type your data, separated by commas, spaces or new lines, and it instantly returns the count, sum, mean (average), median, mode, range, minimum and maximum, sample and population variance and standard deviation, quartiles and the interquartile range (IQR).
It shows the working values and the sorted data so you can check homework or sense-check a report, and it handles decimals and negative numbers. Choose between sample and population formulas — the correct one depends on whether your data is the whole group or just a sample of it.
Key features
Complete summary
Mean, median, mode, range, variance, standard deviation and quartiles.
Sample and population
Both standard deviation formulas are shown side by side.
Flexible input
Comma, space or line separated; decimals and negatives allowed.
Sorted data
See the ordered list and frequency of each value.
How to use it
- Type or paste your numbers.
- Read the summary statistics that appear instantly.
- Use the sample or population values as appropriate.
- Copy the results for your report or assignment.
Worked example
Example
Data: 2, 4, 4, 4, 5, 5, 7, 9 Mean: 5 Median: 4.5 Mode: 4 Range: 7 Population SD: 2 Sample SD: 2.138
Who uses this tool
Students
Check homework and learn how each statistic is calculated.
Analysts and researchers
Get quick descriptive statistics without opening a spreadsheet.
Teachers
Generate examples with complete working values.
Tips for the best results
- Use population formulas when your data covers everyone; use sample formulas when it is a subset.
- Look at the median as well as the mean when data has outliers.
- Check the mode list — there can be several modes or none.
- Use the IQR to spot outliers.
Common mistakes to avoid
- Mixing up sample and population standard deviation.
- Using the mean for skewed data where the median is more representative.
- Including text or units in the data box, which are ignored.
Why use AZRS QuickFix?
It is 100% free, needs no signup and has no watermark or usage limits. The tool runs in your browser, so what you type stays on your device, and it works on phones, tablets and desktops. New tools are added every week — bookmark this page or browse the full QuickFix toolbox.
Frequently asked questions
What is the difference between mean, median and mode?
Mean is the average, median is the middle value when sorted, and mode is the most frequent value.
When do I use sample standard deviation?
When your numbers are a sample of a bigger group; it divides by n−1 instead of n.
What is the IQR?
The interquartile range is Q3 minus Q1 — the spread of the middle 50% of the data.
Can there be more than one mode?
Yes. If several values tie for most frequent, all are listed.
Does it handle negative numbers and decimals?
Yes.
Is it free?
Yes, with no signup and no data leaves your browser.