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How do you calculate percentage change?

25.03.23 10:11 AM By Stackerd

The idea of percentage change is often used to compare two quantities. To compare changes in sales, pricing, or even the stock market, it is often employed. The percentage change may inform us if something has risen or decreased over time and by how much. We will go through how to determine the percentage change in this post.



What is Percentage Change?


The difference between two numbers stated as a percentage of the starting value is called a percentage change. It is a handy tool for tracking a variable's growth or decline over time. In order to represent it as a percentage, the difference between two numbers is computed by taking that difference, dividing it by the original value, and then multiplying that result by 100.


How to calculate percent change?


We need the original value and the updated value in order to compute the percentage change. Let's take the example of a product that was sold for $100 last year and now sells for $120. We must do the following actions in order to determine the percentage change:


Step 1: Find the difference between the new value and the old value.

$120 - $100 = $20


Step 2: Divide the difference by the old value.

$20 ÷ $100 = 0.2


Step 3: Multiply the result by 100 to express it as a percentage.

0.2 x 100 = 20%


Therefore, the percentage change in the price of the product is 20%.


Calculating Increase in Percentage


A measure of how much something has grown over time is the percentage growth. It is determined by multiplying by 100 and dividing the difference between the new and old values.


Take the identical item that sold for $100 last year and now costs $120 as an example. We must do the following procedures in order to determine the percentage increase:


Step 1: Find the difference between the new value and the old value.

$120 - $100 = $20


Step 2: Divide the difference by the old value.

$20 ÷ $100 = 0.2


Step 3: Multiply the result by 100 to express it as a percentage.

0.2 x 100 = 20%


Therefore, the percentage increase in the price of the product is 20%.


Finding the Percentage Decline


A measure of how much something has reduced over time is a percentage decline. It is determined by multiplying the result by 100 and dividing the difference between the old and new values by the old value.


Let's take another example. A company's income dropped from $50,000 to $40,000 this year from $50,000 previous year. We must do the following actions in order to determine the percentage decrease:


Step 1: Find the difference between the old value and the new value.

$50,000 - $40,000 = $10,000


Step 2: Divide the difference by the old value.

$10,000 ÷ $50,000 = 0.2


Step 3: Multiply the result by 100 to express it as a percentage.

0.2 x 100 = 20%


Final Thought


A basic ability that is necessary in many disciplines, including finance, economics, and statistics, is the ability to calculate percentage change. We can get the % change, increase or decrease, and percentage points using the straightforward method that involves dividing the difference between the two numbers by the original value and multiplying it by 100. We can successfully examine data and make educated judgments if we have a solid knowledge of percentage change.


This operation may be made simpler and faster by using a percentage change calculator. These calculators can determine the percentage change for you and are accessible online, saving you time and work. They are especially handy when you need to determine percentage change for a huge quantity of data. The calculator will quickly give you the % change, increase or reduction, and percentage points once you input the original and new numbers.


knowing how to compute percentage change is crucial in today's society. Understanding percentage change is essential whether you are comparing pricing, assessing stock market movements, or looking at economic statistics. You can speed up and improve the process by utilizing a percentage change calculator.

Stackerd