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Investment Return Calculator
Compound Growth & ROI

See how your investments grow over time with compound interest. Add monthly contributions and compare growth scenarios instantly.

Investment Details
$
$
%
yrs
%
Your Investment Growth
Final portfolio value
$284,931
After 20 years at 7% return
Total Invested
$130,000
Total Returns
$154,931
ROI
119.2%
Real Value
$175,640
Money multiplier
2.2× your money

Growth Milestones

How your portfolio value grows at key time intervals.

Portfolio Growth Over Time

Total portfolio value vs. amount invested over the years.

Year-by-Year Breakdown

Detailed annual view of contributions, returns, and portfolio value.

Annual Summary

YearContributedInterest EarnedTotal InvestedPortfolio Value

Investment FAQs

Common questions about investing, compound interest, and returns.

Compound interest means you earn returns not just on your initial investment, but also on the returns you've already earned. This creates an exponential growth curve. For example, $10,000 at 7% for 30 years grows to over $76,000 — without adding a single extra dollar. Albert Einstein reportedly called compound interest the "eighth wonder of the world," and for good reason: time is the most powerful variable in investing.
The S&P 500 has historically returned about 10% per year on average before inflation, or roughly 7% after adjusting for inflation. Conservative investments like bonds average 3–5%. Riskier growth portfolios may target 10–12%+, but with higher volatility. For long-term planning, 6–8% is a commonly used assumption for a diversified stock portfolio. This calculator defaults to 7% as a moderate, inflation-adjusted estimate.
Enormously. Starting at 25 vs. 35 with the same $500/month at 7% makes a difference of over $500,000 by retirement age. The first decade of investing generates the foundation that all future compounding builds upon. Even small amounts invested early beat larger amounts invested later — this is why financial advisors consistently say "time in market beats timing the market."
The nominal value is what your portfolio will be worth in future dollars. The real (inflation-adjusted) value is what that money will actually buy in today's purchasing power. With 2.5% inflation over 20 years, $284,000 in future dollars is worth only about $175,000 in today's terms. Always consider real returns when planning for long-term goals like retirement.