# Quartiles Calculator

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Find Q1 Q2 and Q3 using this free online quartiles calculator.

## What is the First, Second and Third Quartile

The first quartile marks the point that is bigger than 25% of all data.

The second quartile represent the median which is bigger than 50% of all data.

The third quartile represents ther number that is higher than 75% of all data

## What is interquartile range IQR

Interquartile range is the difference between Q1 and Q3.  It can be calculated as Q3 - Q1. The IQR is always positive because Q3 is always greater than or equal to Q1.

## What Does the IQR tell you

A large interquartile range means that the middle of the distribution of your numbers is quite spread out. if you plot the data as a histogram the middle Peaks would not be very high and instead would be kind of flat.

A small interquartile range means that the middle part of your data is congested. If you plotted your data as a histogram the middle bins would be very high.