Starting at age 18 how much money would you need to save each month to have a million dollars by age 40?

To accumulate a million dollars by age 40, starting at age 18, you would need to save approximately $1,200 each month, assuming an average annual return of about 7% from investments. This calculation considers a 22-year investment horizon. If the return is lower or you start saving later, the monthly amount required would increase significantly.