Statistics Calculator
Calculate mean, median, mode, range, variance, standard deviation, and an optional z-score from a user-entered data set.
Last updated: 2026-03-25
Statistics calculator
Enter your values
Paste a list of numbers to get descriptive statistics and an optional z-score in one pass.
Mean
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Enter a data set to calculate descriptive statistics and understand the shape of the values.
Calculation History(0)
Example calculations
Tap an example to prefill the calculator with sample values.
Small class quiz scores
Six scores with one repeated value
A quick descriptive-statistics pass over a short student data set.
Result: Mean 8.17, median 8, sample SD about 2.93
Operations sample
Eight values with a candidate z-score check
Useful when you want the data set summary and the position of one observed value in the same run.
Result: Mean 22.5 and a z-score a little above 2 for the top value
How the statistics calculator works
The calculator parses your numbers, sorts them, and computes center and spread measures from that cleaned list. It reports both population and sample spread so you do not have to remember which denominator belongs to which context.
The optional z-score is an extra convenience layer. It uses the same mean and sample standard deviation already computed from your data rather than a separate external assumption.
Statistics calculator FAQs
Mean, spread, modes, and how to read the optional z-score.
Does this use sample or population standard deviation?
It reports both when the data set is large enough. That way you can use the sample view for inference and the population view when the full population is truly in the data set.
What happens when every value is unique?
The calculator reports that there is no repeated mode. That is more honest than forcing a single value to pretend it is the mode when all frequencies are equal to one.
How is the z-score calculated?
The optional z-score compares your chosen raw score with the sample mean and sample standard deviation. If the sample standard deviation is 0, the z-score is not meaningful.
Embed this calculator
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