Statistical Calculator
Calculate mean, median, mode, standard deviation, and more.
Last reviewed by the Radiatus Cloud team
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Summarise a set of numbers at a glance
A list of numbers is hard to grasp until you reduce it to a few summary figures. This calculator takes your data and computes the mean, median, mode, standard deviation and more, so you can describe a dataset with the handful of statistics that actually characterise it.
Why mean and median can disagree
The mean is the average and the median is the middle value, and when they differ it tells you something. A few very large values pull the mean up while leaving the median where it is, which is why income is usually reported as a median: the mean is distorted by the top. Seeing both, alongside the standard deviation that measures spread, gives a fuller picture than any one number, which is exactly why a single average so often misleads.
The spread matters as much as the centre
Two datasets can share a mean and be completely different, one tightly clustered, one wildly scattered. Standard deviation captures that spread, and it is the figure that turns "the average is 50" into "the average is 50 and most values are within 5" or "within 40". Reporting the centre without the spread hides half the story. The calculation runs in your browser.
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Frequently Asked Questions
What is the difference between mean and median?
The mean is the average of all values; the median is the middle value when sorted. They differ when a few extreme values skew the data, which is why median is often used for things like income.
What does standard deviation tell me?
How spread out the values are around the mean. A small standard deviation means the data is tightly clustered; a large one means it is widely scattered.
What is the mode?
The most frequently occurring value. A dataset can have one mode, several, or none if every value is unique.
Why report spread as well as average?
Because two datasets with the same average can be completely different in how scattered they are. The spread is half the story an average alone hides.
Is my data uploaded?
No. The calculation runs entirely in your browser.
Privacy & Security
Calculations done locally.
About This Tool
This tool runs entirely in your browser. No data is sent to any server, ensuring complete privacy. Simply use the interface above to get started — no registration or login required.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
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