In economics, elasticity of demand measures how responsive the quantity demanded of a good or service is to changes in its price. It is an important concept for businesses to understand, as it can help them make informed decisions about pricing and marketing strategies.
In this article, we will walk you through the steps on how to calculate elasticity of demand, using both the arc elasticity and point elasticity formulas. We will also discuss the different factors that can affect elasticity of demand and explore some of the applications of this concept in realworld scenarios.
To understand how to calculate elasticity of demand, we need to first define what it is and why it is important. Elasticity of demand is a measure of how the quantity demanded of a good or service changes in response to a change in its price. It is expressed as a percentage and can be either positive or negative.
How to Calculate Elasticity of Demand
To calculate elasticity of demand, you need to gather data on price and quantity demanded. Once you have this data, you can use the following steps:
 Calculate the percentage change in quantity demanded.
 Calculate the percentage change in price.
 Divide the percentage change in quantity demanded by the percentage change in price.
 The result is the elasticity of demand.
 Interpret the elasticity of demand.
 Consider the factors that can affect elasticity of demand.
 Apply elasticity of demand to realworld scenarios.
 Use elasticity of demand to make informed business decisions.
By following these steps, you can accurately calculate elasticity of demand and gain valuable insights into how consumers respond to changes in price.
Calculate the Percentage Change in Quantity Demanded
To calculate the percentage change in quantity demanded, you need to first determine the initial quantity demanded and the final quantity demanded. The initial quantity demanded is the quantity demanded at the original price, while the final quantity demanded is the quantity demanded at the new price.

Find the initial quantity demanded.
This is the quantity demanded at the original price.

Find the final quantity demanded.
This is the quantity demanded at the new price.

Calculate the difference between the initial and final quantity demanded.
This is the change in quantity demanded.

Divide the change in quantity demanded by the initial quantity demanded.
This will give you the percentage change in quantity demanded.
For example, if the initial quantity demanded is 100 units and the final quantity demanded is 120 units, then the change in quantity demanded is 20 units. Dividing 20 by 100 gives us a percentage change in quantity demanded of 20%. This means that the quantity demanded increased by 20% when the price changed.
Calculate the Percentage Change in Price
To calculate the percentage change in price, you need to first determine the initial price and the final price. The initial price is the price of the good or service before the change, while the final price is the price of the good or service after the change.

Find the initial price.
This is the price of the good or service before the change.

Find the final price.
This is the price of the good or service after the change.

Calculate the difference between the initial and final price.
This is the change in price.

Divide the change in price by the initial price.
This will give you the percentage change in price.
For example, if the initial price is \$10 and the final price is \$12, then the change in price is \$2. Dividing 2 by 10 gives us a percentage change in price of 20%. This means that the price increased by 20%.
Divide the Percentage Change in Quantity Demanded by the Percentage Change in Price
Once you have calculated the percentage change in quantity demanded and the percentage change in price, you can divide the two to get the elasticity of demand. The formula for elasticity of demand is:
Elasticity of demand = Percentage change in quantity demanded / Percentage change in price
For example, if the percentage change in quantity demanded is 20% and the percentage change in price is 10%, then the elasticity of demand is 2. This means that for every 1% change in price, the quantity demanded changes by 2% in the opposite direction.
If the elasticity of demand is greater than 1, then the demand is elastic. This means that a small change in price will lead to a large change in quantity demanded. If the elasticity of demand is less than 1, then the demand is inelastic. This means that a small change in price will lead to a small change in quantity demanded.
If the elasticity of demand is exactly 1, then the demand is unit elastic. This means that a small change in price will lead to an equal and opposite change in quantity demanded.
The elasticity of demand can be used to make informed decisions about pricing and marketing strategies. For example, if a company knows that the demand for its product is elastic, then it may decide to lower the price in order to increase sales. Conversely, if a company knows that the demand for its product is inelastic, then it may decide to raise the price in order to increase profits.