Lower or First Quartile Calculator

Use our simple online calculator to calculate the Lower or First Quartile value of any series of numbers.

  1. Home
  2. Lower or First Quartile

How to use the Lower or First Quartile Calculator

Step 1

Enter your set of numbers in the input field. Numbers must be separated by commas.

Step 2

Press Enter on the keyboard or on the arrow to the right of the input field.

Step 3

In the pop-up window, select “Find the Lower or First Quartile”. You can also use the search.

What is Lower or First Quartile in Math

Quartiles are values that divide a data table (or part of it) into four groups containing an approximately equal number of observations. The total volume is divided into four equal parts: 25%, 50%, 75% 100%. The first quartile (or lower quartile) Q1 is defined as a value containing an f-value of 0.25. This is the same as the twenty-fifth percentile. The first quartile is calculated by interpolating between f-values that are directly below and above 0.25 to find the value corresponding to the f-value of 0.25.