How this works in your browser
Values are parsed from whatever separators you used, then each statistic is computed directly. Median requires sorting and taking the middle value, or averaging the two middle values for an even count. Mode counts frequencies and reports every value tied for the highest, since a data set can legitimately have several. Variance is the mean of the squared deviations from the mean and standard deviation is its square root, which is what returns the figure to the original units. This uses the population formula, dividing by the count rather than one less, which is correct when your numbers are the whole group of interest rather than a sample standing in for something larger.
Statistics Calculator vs. typical online calculators
| Feature | Statistics Calculator (in-browser) | Typical online calculators |
|---|---|---|
| Where the maths runs | In your browser, on your device | Often posted to a server to compute |
| Your inputs are stored | Never - nothing is sent or saved | Frequently logged with your session |
| Works offline once loaded | Yes | No - needs a live connection |
| Ads inside the result area | None | Common on free calculators |
| Account required | No | Often, to save or export results |
| Usage limits | None - free, unlimited use | Sometimes capped per day |
Who uses Statistics Calculator
Quick data checks
Get summary statistics without opening a spreadsheet.
Reviewing test scores
See the spread and central tendency of a set of marks.
Homework and coursework
Check statistics calculations while learning the formulas.
Analysing sensitive figures
Compute statistics on confidential data without uploading it.
How to use Statistics Calculator
- 1
Open the Statistics Calculator
Go to tools.slaytic.com and open the calculator. No sign-up or account required.
- 2
Paste your numbers
Paste or type a list of numbers, separated by commas, spaces, or new lines.
- 3
Get your results instantly
See count, mean, median, mode, standard deviation, variance, minimum, and maximum calculated instantly in your browser.
Frequently asked questions
Is this statistics calculator free?
Yes, completely free to use with no limit on how many data sets you calculate.
How should I format the numbers?
Separate numbers with commas, spaces, or new lines - any combination works, and negative or decimal numbers are supported.
What if there are multiple modes?
All values tied for the highest frequency are listed as the mode(s).
Is standard deviation calculated as sample or population?
Population standard deviation is used (dividing by N, not N-1), suitable when your data represents the entire group of interest rather than a sample.
Does the population formula matter for my data?
It matters if your numbers are a sample drawn from a larger group, because the population formula will slightly understate the spread. The gap shrinks as the data set grows and is negligible beyond a few dozen values, but for a small sample intended to represent something larger, use software that applies the sample correction.
Should I look at the mean or the median?
The median, whenever the data might contain outliers. One extreme value drags the mean substantially while barely moving the median, which is why incomes and house prices are almost always reported as medians. Comparing the two is informative in itself: a large gap tells you the distribution is skewed.
What does standard deviation actually tell me?
How spread out the values are around the mean, in the same units as the data. Two sets can share a mean and look nothing alike, and the standard deviation is what distinguishes them. A small value means the numbers cluster tightly; a large one means they scatter.
Is my data sent anywhere?
No. The calculation runs in your browser, so figures you would not paste into an online service are safe to analyse here.