# how to create a formula in excel to calculate percentage increase

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## How to calculate percentage change or difference between two numbers in Excel?

This article is talking about calculating percentage change or difference between two numbers in Excel

**Calculate percentage change/difference between two numbers with formula**

As below screenshot shown, you need to calculate the percentage change between new number 94 and old number 80. The formula =(new_value-old_value)/old_value can help you quickly calculate the percentage change between two numbers. Please do as follows.

1. Select a blank cell for locating the calculated percentage change, then enter formula **=(A3-A2)/A2** into the Formula Bar, and then press the **Enter** key. See screenshot:

2. Keep selecting the result cell, then click the **Percent Style** button in the **Number** group under **Home** tab to format the cell as percentage. See screenshot:

Now the percentage difference between two given numbers is calculated.

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## Calculator

An **electronic calculator** is typically a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics.

The first solid-state electronic calculator was created in the early 1960s. Pocket-sized devices became available in the 1970s, especially after the Intel 4004, the first microprocessor, was developed by Intel for the Japanese calculator company Busicom. They later became used commonly within the petroleum industry (oil and gas).

### Modern electronic calculators

Modern electronic calculators vary from cheap, give-away, credit-card-sized models to sturdy desktop models with built-in printers. They became popular in the mid-1970s as the incorporation of integrated circuits reduced their size and cost. By the end of that decade, prices had dropped to the point where a basic calculator was affordable to most and they became common in schools.

Computer operating systems as far back as early Unix have included interactive calculator programs such as dc and hoc, and calculator functions are included in almost all personal digital assistant (PDA) type devices, the exceptions being a few dedicated address book and dictionary devices.

In addition to general purpose calculators, there are those designed for specific markets. For example, there are scientific calculators which include trigonometric and statistical calculations. Some calculators even have the ability to do computer algebra. Graphing calculators can be used to graph functions defined on the real line, or higher-dimensional Euclidean space. As of 2016, basic calculators cost little, but scientific and graphing models tend to cost more.

In 1986, calculators still represented an estimated 41% of the world’s general-purpose hardware capacity to compute information. By 2007, this had diminished to less than 0.05%.^{[1]}

resource: wikipedia

## Calculating Percentage Increase in Excel

Percentage increases involve two numbers. The basic mathematical approach for calculating a percentage increase is to subtract the second number from the first number. Using the sum of this figure, divide this remaining figure by the original number.

To give you an example, the cost of a household bill costs **$100** in September, but **$125** in October. To calculate this difference, you could use the excel formula **=SUM(NEW-OLD)/OLD** or for this example, **=SUM(125-100)/100 **in Excel.

If your figures are in separate cells, you can replace numbers for cell references in your formula. For example, if September’s bill amount is in cell **B4** and October’s bill amount is in cell **B5,** your alternative Excel formula would be **=SUM(B5-B4)/B4**.

### The percentage

The percentage increase between September and October is **25%**, with this figure shown as a decimal number (**0.25**) by default in Excel using the formula above.

If you want to display this figure as a percentage in Excel, you’ll need to replace the formatting for your cell. Select your cell, then click the **Percentage Style** button in the **Home **tab, under the **Number** category.

## Calculating Percentage Decrease in Excel

To calculate the percentage decrease between two numbers, you’ll use an identical calculation to the percentage increase. You subtract the second number from the first, then divide it by the first number. The only difference is that the first number will be smaller than the second number.

Using cell references, if October’s bill amount of **$125** is in cell **B4** and November’s bill amount of **$100** is in cell **B5**, your Excel formula for a percentage decrease would be **=SUM(B5-B4)/B4**.

## Calculating a Percentage as a Proportion of a Number

In Excel, the formula to calculate this example would be **=50/100**. Using cell references, where **$100** is in cell **B3** and **$50** is in cell **B4**, the excel formula required is **=B4/B3.**