Does A Roth IRA Double Every 7 Years? 
The fact that it is a Roth IRA is irrelevant . The doubling of an investment has to do with the interest rate it is earning . If you use the Rule of 72 , a formula by Albert Einstein , it is a great measurement of doubling money . The rule is simple , divide the number 72 by the interest rate you are receiving -LRB- 72/10 = 7.2 -RRB- , and you will find the number of years it will take to double your money . It is called the Rule of 72 because at 10 % interest , the money will double every 7.2 years . So in order to double your Roth IRA every 7 years it must be earning just over 10 % . This is a very aggressive estimate with current interest rates around 1 % to 2 % . 