How much you need to save to become a millionaire in 15 years

Article from CNBC:

To become a millionaire in 15 years with no savings:

•  With a 4 percent rate of return: $4,063.55 per month 
•  With a 6 percent rate of return: $3,438.57 per month 
•  With an 8 percent rate of return: $2,889.85 per month 

 To become a millionaire in 15 years with $10,000 in savings:

•  With a 4 percent rate of return: $3,249.88 per month 
•  With a 6 percent rate of return: $2,638.21 per month 
•  With an 8 percent rate of return: $2,105.20 per month 

 To become a millionaire in 15 years with $20,000 in savings:

•  With a 4 percent rate of return: $2,436.21 per month 
•  With a 6 percent rate of return: $1,837.85 per month 
•  With an 8 percent rate of return: $1,320.54 per month 

 The average annualized total return for the S&P 500 index is more than 9 percent. So start saving!

Here are a few simple, low-stress ways to start investing:

• Sign up for your employer's 401(k) plan and take full advantage of any company match, which essentially gives you free money
• Contribute to a Roth IRA or traditional IRA, an individual retirement account that offers tax breaks
• Use micro-investing apps such as Acorns, which help you begin by investing small amounts of what it calls your "spare change." The app rounds up your purchases to the nearest dollar and automatically puts your coins to work
• Try other apps that aim to make investing simple
• Consider automated investing services known as robo-advisors that can help you out no matter how much you have in the bank
• Research low-cost index funds, which Warren Buffett recommends