Statistics · 10 calculators

Statistics Calculators

Q: Do you use population or sample formulas?

Where it matters — like standard deviation and variance — the tool lets you choose population or sample, since the two use slightly different divisors and give different results.

Q: Do you store the numbers I enter?

No. Every calculation runs entirely in your browser — the figures you type are never sent to or stored on a server.

Analyse a data set in seconds — averages, spread, probability, and more — with clear results for coursework, research, or work.

Jump to Descriptive statistics Probability & inference

Descriptive statistics

Mean, Median, Mode

The three common averages of a data set.

Standard Deviation

How spread out your data is.

Variance Calculator

The squared spread of a data set.

Range Calculator

Difference between highest and lowest.

Average Calculator

Arithmetic mean of any numbers.

Probability & inference

Probability Calculator

Probability of single or combined events.

Permutation & Combination

Count ordered and unordered selections.

Z-Score Calculator

How many standard deviations from the mean.

Sample Size Calculator

Respondents needed for a survey.

Confidence Interval

A range for an estimate at a given confidence.

About our statistics calculators

Statistics turns raw numbers into insight. These tools compute the descriptive measures and probabilities you need most, each using the standard formula so your results line up with the textbook.

Every tool here is free, works instantly in your browser, and never stores the numbers you enter. They give reliable results for everyday use — treat anything high-stakes as a starting point and double-check with a professional.

Frequently asked questions

Are these statistics calculators free?+

Yes. Every statistics calculator on OnlineCalculators.com is completely free, with no sign-up, account, or app required.

Do you use population or sample formulas?+

Do you store the numbers I enter?+