Investment Return Calculator
How much will your investments actually be worth in 20 or 30 years? This investment return calculator projects your portfolio's nominal growth and real inflation-adjusted value — essential for retirement planning, 401k projections, Roth IRA modeling, and any long-term savings goal. Compare return scenarios using real benchmarks like the S&P 500, bonds, or a conservative balanced portfolio.
Investment Return Calculator
Benchmark Presets
Nominal Value after 30 years
$1,285,215
Inflation-adjusted: $678,668
Contributions
$190,000
Gains
$1,095,215
ROI
+576.43%
Nominal vs inflation-adjusted growth
How to Use This Calculator
- 1 Enter your starting investment or portfolio balance.
- 2 Add an annual contribution if you plan to keep investing over time.
- 3 Select a return rate — use benchmarks: S&P 500 (~10.5%), bonds (~4.5%), balanced portfolio (~7%), HYSA (~4.8%).
- 4 Set an inflation rate to see purchasing-power-adjusted real returns.
- 5 Set your investment horizon in years to project your final portfolio value.
Investor Tips
- ✓ Fees matter enormously: a 1% annual fee vs. 0.05% (index fund) can cost 20–25% of your final portfolio over 30 years.
- ✓ Time in the market beats timing the market — consistent investing through downturns is the key to long-term returns.
- ✓ Tax-advantaged accounts (Roth IRA, 401k, HSA) compound without annual tax drag — maximize contributions before taxable accounts.
- ✓ Diversification across asset classes reduces volatility without necessarily reducing long-term expected returns.
Frequently Asked Questions
What is ROI (Return on Investment)?
ROI measures investment gain relative to cost: ROI = (Final Value − Total Invested) ÷ Total Invested × 100%. A 200% ROI means you tripled your money. For comparing investments over different time periods, use CAGR (annualized return) instead of total ROI.
What is CAGR (Compound Annual Growth Rate)?
CAGR is the steady annual rate that would grow an investment from its starting to ending value over a set period. It smooths out year-to-year volatility into one comparable number. Formula: CAGR = (End Value ÷ Start Value)^(1/years) − 1.
What is the historical average stock market return?
The S&P 500 has averaged ~10–10.5% annually before inflation (~7% real) since 1926. Individual years vary wildly: positive roughly 70% of years, with drawdowns of 30–50% in bad years. For retirement planning, using 6–7% real return is a conservative, commonly recommended estimate.
How does inflation affect investment returns?
Inflation erodes purchasing power. A 10% nominal return with 3% inflation = ~6.8% real return. Always plan retirement using real (inflation-adjusted) returns to understand what your money will actually buy. This calculator shows both nominal and real projected values for accurate planning.
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