# 3 Scenarios of Exponential Growth Formula in Excel

If you want to calculate the rise of the population of a region or the bacterial growth rate in a petri dish, you may need to know the usage of the exponential growth formula in Excel. Excel will help you to easily find exponential growth with a few steps. This article will describe 3 scenarios of using the exponential growth formula in Excel.

## Exponential Growth Rate

In the simplest language, the exponential growth rate is a sharp growth that rises over time. The growth shows a massive change with the shift in time. Generally, the exponential growth rate is represented by this equation:

Here,

**y = Exponential Growth Rate****b = Initial Amount****m = Growth Factor****x = Time Period**

The **Exponential Growth Rate** equation is also expressed as:

Here,

**y = Exponential Growth Rate****b = Initial Amount****r = Growth Rate/Decay Rate (generally expressed in percentage ‘%’)****x = Time Frame**

**Apply Exponential Growth Formula with ****GROWTH Function ****in Excel**

The function we used for predicting exponential growth is the **GROWTH** **function**. The **GROWTH function** returns the values in respect of the equation:

**y=b*m^x**

The **GROWTH function** finds the y-values for the new x-values by observing the existing x-values and y-values.

**Syntax **

**GROWTH(known y's, [known x's], [new x's], [const])**

**known y’s**is a required argument. The**known y’s**are a number of y-values already mentioned in the dataset.**known x’s**is an optional argument. The**known x’s**can be either a single variable or a number of variables.**new x’s**are the values that will have corresponding**new y-values**after applying the**GROWTH****function**.**Const**is a logical value. This one is optional. It can be either**TRUE**or**FALSE**.

**Formula**

**=GROWTH(B2:B9,A2:A9,A10:A17) **

**Formula Explanation**

**B2:B9**is the**known y’s**.**A2:A9**is the**known x’s**.**A10:A17**is the**new x’s**.

Follow these steps to apply the Exponential Growth formula in Excel:

- Select an empty cell (
**cell B10**). - Write the formula in
**cell B10: =GROWTH(B2:B9,A2:A9,A10:A17)** - Press
**ENTER**to apply the formula. - Double-click on the
**Fill Handle**at the bottom right corner of**cell B10**.

The new y-values for the new x-values are in cells **B10 **to **B17**.

The results are in decimal form. But I am calculating population in this example and population can not be shown in decimals. So I prefer to change the decimals to round numbers. I will do it using the **ROUND function**. You can try that too.

### Applying the ROUND Function (Optional Steps)

**Formula**

**=ROUND(B10,0)**

**Formula Explanation**

**B10**is the first decimal value.**0**indicates the results will be integers. If I would insert 1, there will be 1 digit after the decimal (1228.8); if I would insert 2, there will be 2 digits after the decimal (1228.86).

To apply ROUND function, follow these steps:

- Create a new column beside the existing columns (
**Round Population: column C**). - Type the formula in
**cell C10.** - Press
**ENTER**. - Double-click on the
**Fill Handle**at**cell C10**.

**Use of TRUE or FALSE in Exponential Growth Formula in Excel**

The equation we are following for the **GROWTH function** is

**y=b*m^x**.

Here, ‘**b’** indicates the **initial value **I have already mentioned.

In the **GROWTH function**, the **const **displays the input of ‘**b’**. You can offer either** TRUE **or **FALSE** as the **const value**.

**Note:**

- If I input
**TRUE**in the formula, the**‘b’**will be calculated naturally. - If I input
**FALSE**in the formula, the**‘b’**will be considered 1. In that case, the equation will be**y=m^x.**

To use the **TRUE** and **FALSE** condition in Exponential Growth in Excel, follow this step-by-step guideline:

- Insert 2 new columns in the data table:
**FALSE(column D)**and**TRUE (column E)**. **FALSE**in**cell D2:****=GROWTH(B2:B9,A2:A9,A10:A17,FALSE)**- Press
**ENTER**. - Double-click on the
**Fill Handle**at**cell D2**. - Write the formula for
**TRUE**inside**cell E2: =GROWTH(B2:B9,A2:A9,A10:A17,TRUE)** - Press
**ENTER**. - Double-click on the
**Fill Handle**.

You will see the bottom cells of** column D **and **column E **are showing **#VALUE!**. Because there are no corresponding inputs for those cells.

Let’s remove the errors!

Select the cells with **#VALUE!**

Click on the **Home **tab.

From the **Editing **group, click on the **Clear **drop-down menu.

Select the option: **Clear Contents**.** **

Now you have a clean data table. Take a look below:

**Use of Growth Rate in Exponential Growth Formula in Excel**

Remember I said earlier, that the **Exponential Growth Rate** equation can be represented using the **Growth** **Rate**. The equation for that: is **y=b(1+r^x)**.

Here, **‘r’ **is the **Growth Rate**.

To show you how you can use the **Growth Rate** in the **Exponential Growth** formula, I have a different dataset here:

The **Growth** **Rate** is expressed in percentages (**%**) usually.

**Formula**

**=B2*(1+B3^B4)**

**Formula Explanation**

**B2**is the starting value.**B3**is the growth rate/decay rate.**B4**indicates the time.

Follow these steps to calculate the Exponential Growth using the growth rate in Excel:

- Write the formula in
**cell B6: =B2*(1+B3^B4)** - Press
**ENTER**to apply the formula.

This way you can use the exponential growth formula in a different structure.

## Conclusion

I hope you get an overall idea about the exponential growth rate formula and how you can use it in Excel in different forms. Feel free to ask anything regarding this article in the comment section. I hope you like my writing. Thank you.

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