Rule of 72              
The Rule of 72 is an easy way to estimate how long it will take your investment to double in value.  Just divide 72 by the rate of return  to see how many years it will take to double.
  Rate of return         Years to Double 
The rate of return is compounded annually. The maximum return you can enter is 20%.
This calculator is for illustrative purposes only. Depending on changes in the rate of return over time, what you’re invested in, how you invest it, how interest is applied, and possible tax implications, the actual amount of time needed to double your money will vary. You should not rely on the results as indication of your financial needs and we recommend that you seek out your own investment, legal, tax or professional advice.
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