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How to Teach Continuous Rate of Growth

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To many readers, "Calculating a growth rate" may sound like an intimidating mathematical process. In actuality, growth rate calculation can be remarkably simple. Basic growth rates are simply expressed as the difference between two values in time in terms of a percentage of the first value. Below, you'll find simple instructions for this basic calculation as well as information about more complicated measures of growth.

Sample Growth Rate Calculator

  1. 1

    Obtain data that shows a change in a quantity over time. All you need to calculate a basic growth rate are two numbers - one that represents a certain quantity's starting value and another that represents is ending value. For instance, if your business was worth $1,000 at the beginning of the month and it's worth $1,200 today, you'll calculate growth rate with 1,000 as your starting (or "past") value and 1,200 as your ending (or "present") value. Let's do a simple example problem. In this case, we will use the two numbers 205 (as our past value) and 310 (as our present value).

    • If both values are the same, there is no growth - the growth rate is 0.

  2. 2

    Apply the growth rate formula. Simply insert your past and present values into the following formula: (Present) - (Past) / (Past) . You'll get a fraction as an answer - divide this fraction to get a decimal value.[1]

    • In our example, we'll insert 310 as our present value and 205 as our past value. Our formula will look like this: (310 - 205)/205 = 105/205 = 0.51

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  3. 3

    Express your decimal answer as a percentage. Most growth rates are written as percents. To convert your decimal answer to a percentage, simply multiply it by 100, then add a percentage sign ("%"). Percentages are an easy-to-digest, universally-understood way to express change between two numbers.[2]

    • So, for our example, we would multiply 0.51 by 100, then add a percent sign. 0.51 x 100 = 51%.
    • Our answer means our growth rate is 51%. In other words, our present value is 51% bigger than our past value. If our present value was smaller than our past value, our growth rate would be negative.

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  1. 1

    Organize your data in a table. This isn't absolutely necessary, but it's useful, as it allows you to visualize your given data as a range of values over a length of time. For our purposes, simple tables will usually suffice - simply use two columns, listing your values for time in the left column and the corresponding values for your quantity in the right column, as above.

  2. 2

    Use a growth rate equation which takes into account the number of time intervals in your data. Your data should have regular values for time, each with a corresponding value for your quantity. The units for these time values aren't important - this method will work for data collected over spans of minutes, seconds, days, etc. In our case, our data is expressed in terms of years. Insert your past and present values into a new formula: (present) = (past) * (1 + growth rate)n where n = number of time periods. [3]

    • This method will give us an average growth rate for each time interval given past and present figures and assuming a steady rate of growth. Because our example uses years, this means we'll get an average annual growth rate.

  3. 3

    Isolate the "growth rate" variable. Manipulate the equation via algebra to get "growth rate" by itself on one side of the equal sign. To do this, divide both sides by the past figure, take the exponent to 1/n, then subtract 1.

    • If your algebra works out, you should get: growth rate = (present / past)1/n - 1 .

  4. 4

    Solve for your growth rate. Insert values for your past and present values, as well as a value for n (which will be the number of time intervals in your data, including your past and present values.) Solve according to basic principles of algebra, order of operations, etc.

    • In our example, we'll use our present figure of 310 and our past figure of 205, along with a time period of 9 years for n. In this case, the average annual growth rate is simply (310/205)1/9 - 1 = .0422
    • 0.0422 x 100 = 4.22%. On average, our value grew by 4.22 percent each year.

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Add New Question

  • Question

    What if the past value is 0?

    Anna Entrambasaguas

    Anna Entrambasaguas

    Community Answer

    Then it isn't really growth rate, but your first profit/loss. You will use this value to calculate your growth rate next year (or other time period).

  • Question

    How do I calculate revenue growth rate over previous year?

    Donagan

    Subtract the previous year's revenue from the current year's revenue, then divide the difference by the previous year's revenue.

  • Question

    How do you calculate growth rate when the initial value is negative?

    Community Answer

    Add past value and present value, and divide by past value without changing their signs.

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VideoRead Video Transcript

  • The entire formula reads as: ((Present - Past) / Past) * 100

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  • This works both ways. You use the same formula whether or not the number goes up or down. It would be a growth reduction in there is a decrease.

    <b>Thanks! We're glad this was helpful.</b><br />Looking for more fun ways to learn on wikiHow?<br />Learn about yourself with <a href='/Quizzes'><b>Quizzes</b></a> or try our brand new <a href='/Games/Train-Your-Brain'><b>Train Your Brain</b></a> word game.

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Article Summary X

To do a simple growth rate calculation, start with two data points that show a change in quantity over time. For instance, if your blog had 25 subscribers last month and now it has 100, you'd set 25 as your starting value and 100 as the ending value for your calculation. To find the growth rate, subtract the starting value from the ending value and divide the difference by the starting value. In our example, (100-25)/25 gives you 75/25, or 3. Multiply the growth rate by 100% to convert it to a percent value. 3 times 100% is 300%, which means the ending value is 300% bigger than the starting value. If you want to calculate an average growth rate over a longer period of time, such as several years, start by organizing your data points in chronological order from oldest to newest. Then, use the formula growth rate = (present/past)^1/n – 1, where n is the number of time periods represented by your data. So, for instance, if your starting value was 17 and your ending value was 36, and this growth took place after a period of 7 years, use the formula growth rate = (36/17)^1/7 – 1, which equals approximately 0.11, or 11%. Keep in mind that this formula assumes that there's a steady rate of growth, so it only takes the start and end values into account. To learn how to calculate the average growth rate over regular time intervals, scroll down!

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