**Rule of 70 Calculator** is an online personal finance assessment tool in the investment category to measure the time period at which an investment gets doubled based on the Rule 70 method. Rule 70 investment doubling time can be calculated by dividing the title 70 by the given interest rate. For example, if you have invested 1000 USD at 10% compound interest rate per annum, the rule of 70 perform the division 70/10 = 7 years required to double the money value based on the rule; an exact calculation gives 7.27 years required to double the money. When it comes to online calculation, this Rule of 70 Calculator can assist you to estimate the required time period