Data summary
10, 12, 12, 15, 18, 21, 21, 21, 25Mean = 17.2222222222
Statistics Calculator
Use this free statistics calculator to summarize a data set with count, sum, mean, median, mode, min, max, range, quartiles, IQR, variance, standard deviation, steps, copy, and history.
Inputs to check Example numbers Copyable answer Tab-only history
Statistics summary9 values
- Mean
- 17.2222222222
- Median
- 18
- Mode
- 21
- Range
- 15
- Sample SD
- 5.1908038341
- IQR
- 9
Steps
- Sort the data: 10, 12, 12, 15, 18, 21, 21, 21, 25.
- Add all values for sum 155 and divide by 9 to get the average.
- Use the middle value for the median and most frequent value for the mode.
- Subtract min 10 from max 25 for the range.
How to use the Statistics Calculator
- Enter a list of numbers separated by commas, spaces, or line breaks.
- Press Calculate statistics to see mean, median, modes, range, quartiles, and standard deviation.
- Review the sorted values and formula steps.
- Use examples, recent answers, or copy the summary while comparing data sets.
What people use it for
Summarize a list of data values in one result card.
Find center, spread, quartiles, and standard deviation together.
Check homework, class data, survey responses, and measurement lists.
Copy descriptive statistics into notes or reports.
Quick examples
No repeated values
4, 8, 15, 16, 23, 42No mode
Exam scores
72, 84, 84, 90, 93Median = 84
Need the guide or a nearby tool?
Need a slower walkthrough, a related calculator, or the full library? These links keep you close to the task you started.
- How to use the Statistics Calculator See slower examples, input meanings, formula notes, result limits, and mistakes to avoid.
- Calculators Browse related calculators and utilities in the same category.
- Calculator and utility guides Find more guides that use real tool inputs and example numbers.
- All free tools Search every live tool, converter, calculator, AI helper, and browser utility.
Frequently asked questions
Quick answers about formulas, inputs, examples, result copying, and private in-browser history.
What does the Statistics Calculator calculate?
It calculates count, sum, mean, median, mode, min, max, range, quartiles, IQR, variance, and standard deviation.
How is the mean calculated?
The mean is the sum of all values divided by the number of values.
What do the main Statistics Calculator inputs mean?
The main inputs are the numbers, operation, mode, or known values the calculator needs. Keep units consistent, enter percentages the way the page label shows, and use the examples as a quick check before trusting the answer.
How should I read the Statistics Calculator answer?
Read the headline answer, then check the supporting lines and examples to understand how the calculator got there. If one input changes, rerun the tool and compare the new answer instead of guessing.
What should I double-check before trusting the Statistics Calculator?
Check units, signs, rounding, and the selected mode before copying the answer. If the number feels weird, rerun one of the examples first, then put your own values back in slowly.
How is the median calculated?
The data is sorted from smallest to largest. The median is the middle value, or the average of the two middle values when there is an even count.
Can a data set have no mode?
Yes. This calculator reports no mode when every value appears only once.
What is IQR?
IQR means interquartile range. It is Q3 minus Q1 and describes the spread of the middle half of the data.
Is my statistics history private?
Yes. Recent statistics answers stay only in the current browser tab while you use the page. They are not sent to a server.
Related tools
Mean, Median, Mode, Range Calculator Find the four headline descriptive statistics for a list of numbers. Open Standard Deviation Calculator Calculate sample or population standard deviation, variance, mean, and count. Open Z-score Calculator Calculate a z-score and approximate standard normal percentile. Open