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To many readers, “calculating the growth rate” sounds like an intimidating mathematical process. In fact, it can be surprisingly simple. The base growth rate is simply expressed as the difference between two values over time relative to a percentage of the first value. Here’s a simple guide to this basic calculation, along with information on more complex growth metrics.
Steps
Calculate the base growth rate
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Collect data that shows quantitative change over time. You only need two numbers to calculate the base growth rate – the number representing the beginning of a given quantity and the number representing its end value. For example, if the value of the business was VND 20 million at the beginning of the month and its value is now VND 24 million, we would calculate the growth rate to the initial (or “past”) value of 20 million. and the final (or “current”) value is 24 million. Let’s do a simple example problem . In this case, we will use two numbers 205 (past value) and 310 (present value).
- If these two values are equal, there is no growth – the growth rate is zero.
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Apply the growth rate formula. We just need to replace the present and past values into the following formula: (Present) – (Past) / (Past) . The resulting fraction is your answer – divide this fraction to get a decimal value.
- For the example problem, we will substitute 310 for the present value and 205 for the past value. The formula becomes: (310 – 205)/205 = 105/205 = 0.51
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Express the decimal answer as a percentage. Most growth rates are written as a percentage. To convert a decimal answer to a percentage, simply multiply it by 100 and add a percent sign (“%”). A percentage is an easily understood and widely understood expression of the change between two numbers.
- So, for the example problem, we’ll multiply 0.51 by 100 and then add the percent sign 0.51 x 100 = 51%.
- That means our growth rate is 51%. In other words, the present value is 51% greater than the past value. If the present value is less than the past value, the growth rate will be negative .
Calculate the average growth rate over regular intervals
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Sort the data into a table. While not strictly necessary, doing so is useful because it allows you to visualize the given data as a series of values over time. Often simple data tables are sufficient for our purposes – you just need to use two columns, listing the time value in the left column and the corresponding quantity value in the right column, similar to picture above.
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Use the growth rate equation to account for the number of time periods in the data. Your data will have regular time values that correspond to the quantity values. The unit of time doesn’t matter – this method can be used for data collected in minutes, seconds, days, etc. In our case, the data is expressed in years. Substitute present and past values into the new formula: (present) = (past) * (1 + growth rate) n where n = number of time periods .
- This method gives the average growth rate of each time period when the current and future parameters are known and the assumption is that the growth rate is uniform. By using the time in years example, we get the average annual growth rate.
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Separate the variable “growth rate”. Using algebraic operations, transform the equation to bring the “growth rate” itself to one side of the equal sign. To do so, we divide both sides by the past parameter, calculate the power of 1/n, and then subtract 1.
- If you do it well, you will get: growth rate = (present / past) 1/n – 1 .
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Solve for growth rate. Substitute past and present values, as well as the value n (the number of time periods in the data, including your past and present values) into the formula. Solve based on basic algebra principles, order of operations, etc.
- For the example problem, we will use the current 310 and the past 205 parameters and the 10 year period for n. In this case, the average annual growth rate is simply (310/205) 1/10 – 1 = 0.0422
- 0.0422 x 100 = 4.22% . On average, my value has increased by 4.22 percent per year.
Advice
- This method can be applied to both cases. You can use the above formula whether the number goes up or down. In the case of a downside, that would be a negative growth.
- The complete formula is written as follows: ((Present – Past) / Past) * 100
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wikiHow is a “wiki” site, which means that many of the articles here are written by multiple authors. To create this article, 20 people, some of whom are anonymous, have edited and improved the article over time.
This article has been viewed 64,365 times.
To many readers, “calculating the growth rate” sounds like an intimidating mathematical process. In fact, it can be surprisingly simple. The base growth rate is simply expressed as the difference between two values over time relative to a percentage of the first value. Here’s a simple guide to this basic calculation, along with information on more complex growth metrics.
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