Most financial advisors suggest that you put 10% to 15% of your salary into savings each year.
If you aim to retire with $750,000, the percentage you need to invest each year depends on how old you are when you start to save.
Here's a case study.
If you start to invest when you turn 25 and you save 13% of your $35,000 income, you will be saving more than $375 every month. That percentage of your salary would put you on track to retire with $750,000.
Watch this video to see a breakdown on how much a person earning $35,000 a year can save for retirement — based on the age that they begin to put money away.
Disclosure: NBCUniversal and Comcast Ventures are investors in Acorns.