Compound interest turns small, steady deposits into serious wealth over time. See real examples showing exactly how much your money can grow.
7 min read · Published 2026-03-17 · Updated 2026-04-04
Simple interest is calculated only on your original deposit. Compound interest is calculated on your deposit plus all previously earned interest. Over long periods, this difference becomes enormous — potentially tens of thousands of dollars.
High-yield savings accounts currently offer 4–5% APY. Broad stock market index funds have historically returned about 7–10% per year on average. The rate you get depends on the type of account and how much risk you accept.
It can build significant wealth over decades. $300/month invested at 8% for 30 years grows to about $447,000. You won't get rich overnight, but compound interest rewards patience like nothing else.
Absolutely. $50/month at 7% for 20 years becomes about $26,000. The key isn't the amount — it's consistency and time. Every dollar compounds.