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Five Number Summary Calculator

Get the minimum, quartiles and maximum of a dataset with the IQR, the outlier fences and a box plot, in three quartile conventions.

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Five Number Summary Calculator is free to use as often as you like, directly from this page. You will find it under Statistics & probability, with Amicable Number Checker and Complex Number Calculator for the neighbouring cases.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What is Five Number Summary Calculator?

Get the minimum, quartiles and maximum of a dataset with the IQR, the outlier fences and a box plot, in three quartile conventions.

When would I actually use this?

Summarising a dataset before drawing conclusions from it, checking whether a difference between two groups is real, and putting an interval around an estimate.

What is the most common mistake?

Reading a p-value as the probability that the hypothesis is wrong. It is the probability of seeing data at least this extreme if the null were true — a different statement, and a much weaker one.

How is Five Number Summary Calculator different from Amicable Number Checker?

They sit next to each other but answer different questions: Amicable Number Checker is the one to open when you need it to check whether two numbers are amicable — or give just one and get its candidate partner plus the verified loop, with perfect and sociable numbers identified. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Complex Number Calculator is the closest one after this: Add, subtract, multiply and divide complex numbers, with modulus, argument, conjugate and polar form.

What else is worth having open alongside it?

e Digits Calculator (Euler's Number) and Fibonacci Number Checker — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

Distributions and test statistics are computed from their standard definitions, not from a lookup table, so results carry more digits than a printed table would. The assumptions each test makes are stated with it.

Further reading

All guides →
ExplainerA 1 % Drop Rate Does Not Mean One Hundred RunsAt 1 %, a hundred attempts give you 63.4 % — not certainty. Ninety per cent takes 230 attempts and ninety-nine takes 459, and more than a third of players are still empty-handed at a hundred.ExplainerWhat Is a Z-Score? Standard Deviations Above the MeanA z-score is z = (x − μ) / σ — how many standard deviations a value sits from the mean. Learn how to compute it, read the standard normal curve, and turn it into a percentile.ExplainerMean, Median and Mode: What's the Difference?Mean, median and mode all describe the 'middle' of your data — but answer different questions. Here's what each means, with examples and when to use which.ExplainerGeometric vs Arithmetic Mean: Which to UseThe arithmetic mean adds and divides; the geometric mean multiplies and takes a root. Learn which fits growth rates, ratios, and averages.How-toHow to Calculate Standard Deviation (Step by Step)Standard deviation measures how spread out your data is. Here's the formula, a worked example, and the difference between population and sample.ExplainerProbability Basics, With ExamplesProbability measures how likely something is, from 0 to 1. Here's the basic idea, how to combine events with AND and OR, and the complement.