Mil Calc 1 Eng How long do I need to save to become a millionaire?This millionaire calculator shows you how long it could take you to become a millionaire. The more you invest monthly and the more you already have invested, the less time you need to become a millionaire. Your age now: Total value of your current savings: $ Monthly savings: $ Rate of Return *: % Proceed ResultsNumber of years to become a millionaire: You will become a millionaire at age: * Interest is compounded monthly and savings are made at the beginning of each month.