Dhristi JEE 2022-24

Definition of Pie Chart

As the name implies, a Pie Chart is a graph that displays the data in a circular format. It is a type of pictorial representation of data that shows the relative sizes of the slices of pie. It requires both categorical and numerical variables for a Pie Chart to work. In this case, the term "pie" represents the whole and the term "slices" represents the parts of the whole. 

Pie diagrams are also called circle charts. They provide a visual representation of statistical data. Pie diagrams represent a proportionate part of a whole. These diagrams can be useful when trying to figure out something's composition. As a result, pie diagrams are replacing bar graphs, line graphs, line plots, histograms, etc.

The Formula of Pie Chart

There are many types of data representations, including Pie Charts. The Pie Chart is divided into segments and sectors, and each segment and sector represents a corresponding portion of the total (percentage). A total of 360° is represented by the data.

The total value of the pie is always 100 percent.

Here are the steps you can follow in order to determine the percentage on a Pie Chart:

1. Data categorization

2. Calculate the total based on the collected data.

3. Divide the categories by the heads.

4. Convert the numbers into percentages.

5. And finally, convert the percentages into degrees.

Therefore, the Pie Chart formula is given as

(Given Data/Total value of Data) × 360°


Definition of Pie Chart:

A graph in which a circle is divided into sections that represent a portion of the whole.


Practical Implications of Pie Chart

Due to its ease of data reading and accessibility, the Pie Chart is widely used. Pie Charts make comparing data easy since they are simple graphs. Here is an example of a Pie Chart:

1. During the growth phase of a business, it enables you to compare business profits, turnover, exposure, etc.

2. Categorical data can also be represented with it.

3. A Pie Chart is generally used to compare data.

4. The amount of time allotted to each section is determined by Pie Charts in schools.

5. The percentage of two-wheelers or four-wheelers owned by people is used to measure the relative size of data such as the type of house people have.

6. The number of weekend customers visiting retail stores.

7. Food and beverage preferences of people in restaurants.

8. Several brand names in the mobile market.

9. Comparative sales of every brand.



  • Despite the simplicity of the image, it's easy to comprehend.

  • A fraction of data can be visualized visually as a part of the whole.

  • Even uninformed audiences can benefit from this tool for good communication.

  • A data comparison gives a quick overview of the data to the audience to allow for quick analysis.

  • It can be removed from the charts by using this line chart, which eliminates the need for readers to examine or measure underlying numbers.

  • It is possible to manipulate data pieces in a Pie Chart to emphasize certain points.



  • In the event of too much data, it becomes less effective.

  • The more data, the less effective it is. It may not help here to add data labels and numbers since those themselves will become cluttered and difficult to understand.

  • A series is needed to compare more than one set of data, as this chart represents only one set.

  • The reader might have difficulty analyzing the information and assimilating it quickly because of this.

FAQs on Pie Chart

1. Explain the Pie Chart and What is Used to Represent Data in the Pie Chart?

The pie chart is a simple pictorial representation of data where the sector represents the relative size of data. Different sizes may be used to represent the same data using pie charts. They are used to represent the proportional data. The concept of pie slices is used to show the percentage of particular data in a whole pie chart.

A sector in the pie chart is also known as pie. A pie is used to represent data in a pie chart. To find the total number of pieces in data, we have to multiply the pie percentage by the total number, and then divide it by 100.

For example to find the value of 20% where the total number of data is equal to 150. The value calculated will be 20% of the pie slice.  (20 x 150) / 100 = 30.

2. Explain with an Example of How a Pie Chart is Constructed?

Steps of construction of a pie chart for a given data. A set of rules is followed to construct a pie chart. This is explained in the following manner:

  1. Find the central angle of the pie chart by using the formula given.

  2. Draw a circle of any radius according to the size of the pie chart.

  3. Draw a horizontal radius.

  4. Starting with the horizontal radius draw radii, making angles corresponding to the values of respective categories.

  5. Repeat the same process with all the categories that are to be showcased in a pie chart.

  6. After the allotment of all categories, shade the portion of the pie in different shades so that they are easily distinguishable.

Let us understand the pie chart with a simple example:

(Image will be uploaded soon)

The pie diagram shows sectors of students having a different collection of books. In the diagram:

  • 44% of students like comic books.

  • 19% of students like storybooks.

  • 6% of students are in favour of poem books.

  • The remaining that is 31% of students are in favour of puzzle books.

3. How does a Pie Chart work?

Pie Charts are visual representations of data. Here, the slices of the pie represent the numbers relative to each other. Different geometric shapes are used to depict the same data.

4. Pie Charts are used for what purpose?

One Pie Chart represents both proportionate and relative data. To show how much a particular dataset represents out of the whole pie, pie slices are used.

5. In a Pie Chart, how do you determine the percentage of data?

Using a Pie Chart, measure the angle of each slice and divide by 360. After that, multiply by 100. A percentage of the specific data will appear.

6. In a Pie Chart, what is the total number of pieces of data?

Multiply the slice percentage by the total number of data and divide by 100 to find how many data points are in a slice of a Pie Chart.

An example of a Pie Chart is one with 60 percent as a slice and 150 data points as the total set. The value of 60% of a pie slice is (60×150)/100 = 90.

7. What are some examples of Pie Charts?The formulato

Pie Charts are used in many real-life situations, including:

Representing marks achieved by students in classes.

Representing the kinds of cars sold in a month.

To show what types of food are popular in a room.