# Lower or First Quartile Calculator

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

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1. For Windows or Linux - Press Ctrl+D

2. For MacOS - Press Cmd+D

3. For iPhone (Safari) - Touch and hold, then tap Add Bookmark

4. For Google Chrome - Press 3 dots on top right, then press the star sign

## How to use the Lower or First Quartile Calculator

1

### Step 1

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

2

### Step 2

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

3

### 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.