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. 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. 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 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.  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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