- 1). Subtract the amount you have at the beginning of the month from the amount you had at the end of the month to find the growth. For example, if a stock you own was worth $40 at the start of the month and is worth $41 at the end of the month, subtract $40 from $41 to get $1.
- 2). Divide the growth by the beginning of the month value to find the rate of growth. For this example, divide $1 by $40 to get 0.025.
- 3). Multiply the rate of growth by 100 to convert to a percentage. In this example, multiply 100 by 0.025 to find the monthly growth rate equals 2.5 percent.
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