If you start saving $500 a month today, you could become a millionaire as early as 2046. But what if you'd rather reach that seven-figure milestone sooner? We used CNN Money's helpful millionaire calculator to estimate when you'll become a millionaire if you're able to contribute $1,000 to an investment account each month, assuming that you're starting from scratch with zero savings.

With a four percent rate of return, you'll become a millionaire in 37 years, by 2054.

With a six percent rate of return, you'll become a millionaire in 30 years, by 2047.

With an eight percent rate of return, you'll become a millionaire in 25 years, by 2042.

With a 10 percent rate of return, you'll become a millionaire in 22 years, by 2039. Want to get rich sooner? If you can hack it, putting away $2,200 per month will make you a millionaire in 20 years, and $6,000 per month will get you there in 10. Try out the calculator yourself here.