Free Quartile Calculator (Statistics)

Welcome to our free quartile calculator! Simply scroll down to the calculator and enter your data set below. If you don’t know what it means to be in a particular quartile, read our introduction to the calculator below. If you need the use of other statistics based calculators, check out our mean, mode and median calculators.

Quartiles are a significant aspect of statistics and are extensively used for data analysis, especially in the field of descriptive statistics. Essentially, quartiles are values that divide a dataset into four equal parts or quarters. They are the three points (Q1, Q2, and Q3) that split the data set into four equal groups. The first quartile (Q1) is the middle value between the smallest value and the median of the data set, the second quartile (Q2) is the median of the data, and the third quartile (Q3) is the middle value between the median and the highest value of the data set. By partitioning data into quartiles, we can easily identify and understand the spread and center of the data, outliers, and whether the data is skewed.

Quartiles are crucial in various statistical calculations. They are most notably used in the calculation of the interquartile range (IQR), which is the range between the first quartile (Q1) and the third quartile (Q3). The IQR is a measure of statistical dispersion and is commonly used to build box plots for visual data representation. Additionally, quartiles are employed in outlier detection; any data point that falls below Q1 – 1.5IQR or above Q3 + 1.5IQR is generally considered an outlier. Quartiles are also handy in comparing the distribution of data points across different data sets. For instance, in business, they can be used to compare sales data across different quarters or regions.

How To Use Our Quartile Calculator


Enter your data

In the text input box labeled "Enter numbers separated by commas," input your data set. Each number must be separated by a comma. For instance, if your data set consists of the numbers 1, 2, 3, 4, and 5, you would enter "1,2,3,4,5" into the box.


Click "Calculate"

After entering your data, press the button labeled "Calculate Quartiles". The calculator will then process the data you entered, sorting it in increasing order and determining the quartile values.


View the results

After the calculations have been done, the results are displayed on the same page under the button. The first quartile (Q1), the second quartile or median (Q2), and the third quartile (Q3) are displayed. These values divide your data into four equal parts, allowing you to understand the spread of your data better.


Find the quartile!