How Percentage is Calculated – A Simple Guide


Percentage is a widely used concept in various fields, including mathematics, finance, and everyday life. It allows us to express proportions, ratios, and comparisons in a simplified form.

How Percentage is Calculated: A Simple Guide

Understanding how percentages are calculated is essential for making informed decisions, analyzing data, and solving everyday problems. In this article, we will explore the fundamentals of calculating percentages and provide practical examples to help you grasp this concept with ease.

What is a Percentage?

A percentage is a way of expressing a fraction or a portion of a whole in relation to 100. It represents a proportion or a share of a given quantity. The symbol “%” is used to denote percentages. For example, 50% is equivalent to half or 0.5, and 25% is equivalent to one-fourth or 0.25.

Calculating Percentages

To calculate a percentage, you need two values: a part and a whole. The part represents the portion you want to find the percentage of, and the whole represents the total or the reference value. The general formula to calculate a percentage is:

Percentage = (Part / Whole) x 100

Percentage Increase/Decrease

Percentages are also useful for calculating changes in values over time. When determining the percentage increase or decrease, you need the original value (before the change) and the new value (after the change). The formula to calculate the percentage increase or decrease is:

Percentage Change = ((New Value - Original Value) / Original Value) x 100

Practical ExamplesHow Percentage is Calculated

Let’s look at some practical examples to illustrate how percentages are calculated.

Example 1

Calculating a Percentage:

Suppose you scored 80 out of 100 on a test. To find your percentage score, apply the percentage formula:

Percentage = (80 / 100) x 100 = 80%

Therefore, you scored 80%.

Example 2

Calculating a Percentage Increase:

Imagine a product’s original price was $50, and it increased to $65. To calculate the percentage increase, use the percentage change formula:

Percentage Increase = ((New Price – Original Price) / Original Price) x 100 Percentage Increase = ((65 – 50) / 50) x 100 = 30%

Hence, the price of the product increased by 30%.

Example 3:

Calculating a Percentage Decrease: Suppose a company’s stock price decreased from $100 to $80. To calculate the percentage decrease, apply the percentage change formula:

Percentage Decrease = ((New Price – Original Price) / Original Price) x 100 Percentage Decrease = ((80 – 100) / 100) x 100 = -20%

The stock price experienced a decrease of 20%.

Understanding How Percentage is Calculated is essential for a wide range of applications. By grasping the fundamental concepts and using the formulas provided, you can easily calculate percentages and interpret them in different contexts. Whether you are analyzing data, comparing prices, or determining the proportion of a value, percentages allow for effective communication and decision-making. So the next time you encounter percentages, you can confidently apply the knowledge gained from this article to solve problems and make informed choices.


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