Millionaire Calculator

About this calculator

This calculator projects how long it will take to reach a $1,000,000 net worth from three inputs: your current savings, a fixed monthly contribution, and an expected annual rate of return. It combines the future value of your existing lump sum, growing at the compound rate, with the future value of a regular monthly contribution stream (an ordinary annuity), and solves for the number of years at which the two combined equal one million.

Small changes compound dramatically over long horizons — increasing the monthly contribution or the assumed return by even a little can cut years off the timeline, while starting later adds them. It is a motivational and planning tool rather than a guarantee, since real markets don't return a fixed rate every year, but it gives a useful ballpark for retirement and long-term wealth planning.