📊 Statistics Calculator
Get mean, median, mode, range and standard deviation from a list.
About this tool
Takes a list of numbers and instantly returns the mean, median, mode, range, and standard deviation — useful for homework, quick data checks, or settling a debate about "the average."
If you're averaging weighted assignment scores for a class rather than a raw dataset, the Weighted Grade Calculator is built for that specific case.
Worked example
For the dataset 4, 8, 15, 16, 23, 42, the mean is 18, the median is 15.5, the range is 38, and the standard deviation is about 12.3 — a quick way to sanity-check a small dataset before doing deeper analysis.
How to use it
- Paste or type your numbers into the box, separated by commas or spaces.
- Press Calculate.
- Read off mean, median, mode, range, and standard deviation.
Tips
- Mean is sensitive to outliers; median is more robust if your data has a few extreme values.
- If your data has no repeated values, mode will show there isn't one.
- Standard deviation shown here is the population version — sample standard deviation divides by n-1 instead, which matters for small survey-style datasets.
FAQ
What's the difference between mean and median?
Mean is the sum divided by the count; median is the middle value when sorted — median resists outliers better.
Does this handle negative numbers?
Yes, negative numbers work fine in the list.
Is the standard deviation sample or population?
This calculates population standard deviation; for sample standard deviation on small datasets, the true value will be slightly higher.