# How To Calculate Percent Change [Step-by-Step Easy Guide]

If you want to know How To Calculate Percent Change then you’re in the right place. Percent change is a commonly used mathematical formula to calculate the change in a value over time. It measures the difference between two values as a percentage of one of the values. Understanding percent change is important in various fields such as economics, finance, and statistics.

## How to Calculate Percent Change

Calculating percent change is a straightforward process that allows you to determine the relative difference between two values, typically expressed as a percentage. It is a valuable tool in various fields, including finance, statistics, and economics. The formula for percent change is [(New Value – Old Value) / Old Value] * 100. Here’s a step-by-step guide on how to calculate percent change:

1. Identify the Old Value – Begin by identifying the initial value or the “old value” of the quantity you want to calculate the percent change for. For example, if you are analyzing the changes in the price of a stock, the old value would be the original stock price.
2. Determine the New Value – Next, find the new value or the “current value” of the quantity. This could be the most recent stock price if we continue with the stock example.
3. Calculate the Change – Subtract the old value from the new value to find the absolute change. This gives you the numerical difference between the old and new values.
4. Calculate Percent Change – Now, divide the absolute change by the old value and multiply by 100 to express the result as a percentage. The formula for percent change, as mentioned earlier, is [(New Value – Old Value) / Old Value] * 100.

Remember, if the result is positive, it indicates an increase, whereas a negative result signifies a decrease in the quantity. Learn How To Find The Average Rate Of Change here.

### Easy Ways to Calculate Percentage Change

While calculating percent change may seem daunting at first, there are several easy ways to perform the calculation. Here are a few techniques that can simplify the process:

1. Calculator Method – If you have a calculator at hand, this is the easiest way. Input the old value, subtract it from the new value, divide the result by the old value, and then multiply by 100 to get the percentage change.
2. Excel or Spreadsheet – Use spreadsheet software like Microsoft Excel or Google Sheets. Enter the old value in one cell, the new value in another, and then use a formula (new value – old value) / old value to get the percentage change.
3. Proportions – Another approach involves using proportions. Divide the new value by the old value, subtract 1, and then multiply by 100 to get the percentage change.
4. Mental Math Approximation – For quick estimates, you can use mental math. Round the numbers to the nearest whole number and calculate the percentage change accordingly.

Regardless of the method you choose, always double-check your calculations to ensure accuracy.

### Percentage Change Formula

The percentage change formula is a fundamental concept used to measure the relative difference between two values and express it as a percentage. It finds application in various scenarios, such as calculating inflation rates, stock market fluctuations, population growth rates, and more. The formula is straightforward:

Percentage Change = [(New Value – Old Value) / |Old Value|] * 100

The numerator represents the absolute change between the old value and the new value, while the denominator is the absolute value of the old value, ensuring that the result is always positive.

For example, let’s say a company’s revenue was \$1,000 in the first quarter and \$1,500 in the second quarter. To find the percentage change in revenue:

Percentage Change = [(1,500 – 1,000) / |1,000|] * 100 = (500 / 1,000) * 100 = 50%

A positive result (like in this case) indicates an increase, while a negative result would mean a decrease.

The percentage change formula is a versatile tool, and it’s crucial to understand it when analyzing data, making business decisions, or interpreting statistical trends. By using this formula correctly, you can effectively compare changes over time and gain valuable insights from the data at hand.