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How to Calculate Your Investment Return (ROI, CAGR, and What They Actually Mean)

April 10, 20256 min read

"My investment is up 40%" tells you almost nothing without context. 40% over 2 years is excellent. 40% over 15 years is poor — barely 2% per year, well below inflation. Investment returns need to be measured per year, net of fees, and compared to appropriate benchmarks. Otherwise you're navigating blind.

Simple ROI: Total Return

Return on Investment (ROI) = (Current Value − Initial Investment) ÷ Initial Investment × 100

Example: you invested $10,000 and it's now worth $14,000. ROI = ($14,000 − $10,000) ÷ $10,000 = 40%.

Simple, but limited. It ignores how long the investment has been held. A 40% return in 2 years is very different from 40% in 10 years. For time-adjusted analysis, you need CAGR.

CAGR: The Metric That Actually Matters

Compound Annual Growth Rate (CAGR) expresses what a constant annual return would produce the same total growth. Formula:

CAGR = (Ending Value ÷ Beginning Value)^(1 ÷ Years) − 1

$10,000 growing to $14,000 over 3 years: CAGR = (14,000 ÷ 10,000)^(1/3) − 1 = 1.4^0.333 − 1 ≈ 11.9%/year

Always compare CAGR against a benchmark. The S&P 500's 10-year average CAGR is roughly 12–14% (nominal). If your stock picks returned 8% CAGR over the same period, the index outperformed you significantly. Most active investors underperform index funds over 10+ years.

Real Return: Adjusting for Inflation

Nominal return is what your brokerage statement shows. Real return is what actually happened to your purchasing power.

Real return ≈ Nominal return − Inflation rate (approximate)

More precisely: Real return = (1 + nominal rate) ÷ (1 + inflation rate) − 1

10% nominal return at 3% inflation → 6.8% real return
7% nominal return at 4% inflation → 2.9% real return
4% HYSA at 5% inflation → -0.9% real return (you're losing ground)

The Fee Drag Problem

Investment fees compound just like returns — but in the wrong direction. Expense ratios on actively managed funds often run 0.5–1.5% annually.

$100,000 at 8% gross return for 30 years = $1,006,265
Same with 1% annual fee (7% net): $761,225
Difference: $245,040 — almost a quarter million dollars lost to fees

Low-cost index funds from Vanguard, Fidelity, and Schwab typically charge 0.03–0.20% expense ratios. This single factor explains a large portion of why index funds outperform most active funds over 10+ year horizons.

Try it yourself

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Frequently asked questions

What's a good annual investment return?

The S&P 500 has returned approximately 10% annually (nominal) or 7% after inflation historically. For a diversified equity portfolio, 7–10% nominal is a reasonable long-term expectation. For bonds, 3–5%. Mixed portfolios fall in between. Be skeptical of any investment promising consistent returns above 10–12% — high advertised returns usually mean high risk or fraud.

Should I include dividends in return calculations?

Yes, always. Total return = price appreciation + dividends reinvested. A stock that gained 5% in price but paid a 3% dividend had an 8% total return. Many index funds (especially dividend-focused ones) derive a significant portion of returns from dividends. Excluding them dramatically understates performance.

How is IRR different from CAGR?

CAGR works for a single lump-sum investment held for a period. IRR (Internal Rate of Return) handles irregular cash flows — multiple investments at different times, partial withdrawals, dividend reinvestments. For evaluating a series of contributions (like a DCA strategy or real estate with multiple cash flows), IRR is more accurate than CAGR.

What benchmark should I compare my returns to?

Compare to the most relevant index for your investment type: S&P 500 for large-cap US stocks, Total Stock Market index for broad US equity, MSCI World for global equity. Asset allocation matters — a 60/40 portfolio shouldn't be compared to a 100% equity index. Many brokerages now show benchmark comparisons automatically in their apps.

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