Free Statistics Calculator: Mean, Median, Standard Deviation
Need to crunch some numbers but don't want to open Excel or write code? Our free statistics calculator takes a set of numbers and gives you every common statistical measure instantly — mean, median, mode, standard deviation, variance, range, and more. Just paste your data and get results.
What It Calculates
Enter your dataset (comma-separated, space-separated, or one number per line) and the calculator gives you:
- Mean — The average of all values
- Median — The middle value when sorted
- Mode — The most frequently occurring value(s)
- Standard deviation — How spread out the values are (both population and sample)
- Variance — The square of standard deviation
- Range — Difference between max and min
- Sum and count — Total sum and how many values you entered
- Quartiles — Q1, Q2 (median), and Q3 for understanding distribution
When You Need Quick Stats
I reach for this tool in a bunch of situations. Checking survey results, analyzing response times from a performance test, grading assignments, comparing sales figures across months, or just satisfying curiosity about a set of numbers.
It's faster than setting up a spreadsheet for a one-off calculation, and you don't need to remember which Excel function does what. No formulas to write — just numbers in, stats out.
Understanding Standard Deviation
Standard deviation trips people up, so here's the short version: it tells you how spread out your numbers are from the average. A low standard deviation means the values cluster tightly around the mean. A high one means they're all over the place.
The calculator gives both population and sample standard deviation. Use population (σ) when you have data from every member of a group. Use sample (s) when your data is a subset — which is almost always the case in practice.
Great for Students and Professionals
Stats homework? Paste your problem's dataset and check your manual calculations. Business analysis? Get quick descriptive stats without building a full report. Research? Grab summary statistics before diving into deeper analysis.
The tool also handles edge cases — empty datasets, single values, datasets with no mode — without throwing errors or giving confusing results.
Calculate Your Stats Now
Paste your numbers and get every common statistical measure in one click. No spreadsheet, no formulas, no fuss.