Statistics & Probability

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5-Number Summary Calculator.

Find minimum, quartiles, median, and maximum from a data set.

On-device calculationNo signup
01

Set your values

Results update as you type.

minimum: 2

minimum

2.000000
firstQuartile: 4

firstQuartile

4.000000
median: 6

median

6.000000
thirdQuartile: 9

thirdQuartile

9.000000
maximum: 10

maximum

10.000000

Results update automatically as you type.

Use Cases

Quick data distribution check

Use the 5-number summary to quickly assess the spread and central tendency of a data set, such as test scores, temperatures, or sales figures.

Example: Enter 10, 20, 30, 40, 50 to see min=10, Q1=20, median=30, Q3=40, max=50.

Identify outliers and skewness

Compare the distances between quartiles and extremes to detect potential outliers or skewness in your data distribution.

Example: If Q3 - median is much larger than median - Q1, your data may be right-skewed.

Frequently Asked Questions

What is a 5-number summary?
A 5-number summary is a set of descriptive statistics that provides a quick overview of a data set's distribution. It consists of the minimum, first quartile (Q1), median (Q2), third quartile (Q3), and maximum. These five values help you understand the spread, center, and range of your data.
How are quartiles calculated in this calculator?
The calculator sorts your data values in ascending order. The median is the middle value (or average of two middle values if even count). Q1 is the median of the lower half, and Q3 is the median of the upper half. The exact method may vary, but this is the standard approach.
Can I use this calculator for any type of data?
Yes, as long as your data values are numeric. You can enter integers, decimals, or even negative numbers. The calculator will compute the 5-number summary for any set of numbers you provide.

Tips & Common Mistakes

Tips

  • Enter each data value separated by commas or spaces. For example: 5, 8, 12, 15, 20.
  • Ensure your data values are numeric. Non-numeric entries may cause errors.
  • For large data sets, double-check that you've entered all values correctly to get an accurate summary.
  • Use the 5-number summary to create a box plot for a visual representation of your data.

Common Mistakes to Avoid

  • Forgetting to sort the data before calculating quartiles – the calculator does this automatically, but if you do it manually, always sort first.
  • Confusing the median with the average. The median is the middle value, not the mean.
  • Entering data with commas as decimal separators (e.g., 3,5) – use a period (3.5) instead.

Last updated: August 12, 2026