The average American in their 60s has more than $200,000 in their 401(k).
If you start contributing early enough in your career, you may be able to double or even triple that number by investing a small percentage of your paycheck each week.
CNBC crunched the numbers, and we can tell you how much you will have for retirement if you save $100 per week in your 401(k) throughout your career.
Here's a case study.
The numbers do not account for future changes to contribution limits, employer matches, taxes or any curveballs life may throw at you. So plan accordingly.
Check out this video for a full breakdown.
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Disclosure: NBCUniversal and Comcast Ventures are investors in Acorns.