Rule of 72 Calculator: Estimate Investment Doubling Time

The Rule of 72 lets you estimate doubling time by dividing 72 by your annual return—an 8 % return doubles money in roughly nine years (J.P. Morgan Guide to Markets, 2023).
The Rule of 72 Calculator is an essential financial planning tool that helps investors and financial professionals quickly estimate how long it will take for an investment to double at a given interest rate. This intuitive calculator simplifies complex financial projections by applying the Rule of 72, a mathematical concept that provides a reliable approximation for investment growth periods. Whether you’re planning long-term investments, comparing different interest rates, or explaining growth potential to clients, this calculator delivers instant, accurate results. Financial advisors and investment professionals can use this tool to demonstrate investment scenarios and help clients make informed decisions about their portfolios. Start using our Rule of 72 Calculator today to streamline your financial planning process and make more informed investment decisions.
The Rule of 72 lets you estimate doubling time by dividing 72 by your annual return—an 8 % return doubles money in roughly nine years (J.P. Morgan Guide to Markets, 2023).
The Rule of 72 lets you estimate doubling time by dividing 72 by the annual rate. For example, an 8 % return doubles your money in roughly 9 years (Investopedia, https://www.investopedia.com/terms/r/ruleof72.asp).