As a rule of thumb, most financial advisors suggest that you save 10% to 15% of your salary.
And if your goal is to get to $750,000, the percentage you need to invest will vary drastically based on how old you are when you start.
Here's a case study.
Get Southern California news, weather forecasts and entertainment stories to your inbox. Sign up for NBC LA newsletters.
Starting to invest when you turn 25 means that saving 13% of your $35,000 income, more than $375 every month, will put you on track to retire with $750,000.
Check out this video to see a full breakdown for different timelines.
More from Invest in You:
Americans are more in debt than ever and experts say 'money disorders' may be to blame
How much money do you need to retire? Start with $1.7 million
Money Report
Disclosure: NBCUniversal and Comcast Ventures are investors in Acorns.
Also on CNBC
Copyright CNBC