How to Calculate Investment Returns (ROI)

How how to calculate investment returns (roi) works in practice

Return on Investment (ROI) is the percentage return on an investment relative to its cost. It is the most common metric for comparing investments, projects, and business decisions.

The goal is not to memorize every term — it is to know which inputs matter and what outcome you are aiming for.

So what: When you can explain this in your own words, you are far less likely to accept a bad quote, fee, or assumption.

A real scenario worth running

Buy shares for $5,000, sell for $6,500 after 2 years. Step by step: Gain = $6,500 − $5,000 = $1,500 → ROI = ($1,500 / $5,000) × 100 = 30% → Annualized ≈ (1.30)^(1/2) − 1 ≈ 14% per year. Bottom line: 30% total ROI over 2 years, or roughly 14% annualized return.

So what: Plug your own numbers into the same logic before you decide.

What ROI measures

Return on Investment (ROI) tells you how much profit (or loss) you earned relative to what you invested:

Or when gain is already net: ROI = (Final value − Initial investment) / Initial investment × 100%

Example: Invest $10,000, sell for $14,000 → ROI = ($14,000 − $10,000) / $10,000 = 40%

ROI is simple and widely used — but it has limits (see below).

So what: Run your own inputs before you commit — small changes in assumptions can shift the outcome sharply.

Types of investment returns

Simple ROI

Best for single-period investments with one inflow and one outflow. A flip, a one-year CD, a single stock trade.

Annualized ROI

Essential when comparing investments held for different periods:

$10,000 → $14,000 over 4 years: (14/10)^0.25 − 1 = 8.8%/year — not 40%/year.

Total return

Includes all income: capital gains + dividends + interest + reinvested distributions.

Stock example: Buy at $100, receive $5/year dividends for 3 years, sell at $130.

• Capital gain: $30
• Dividends: $15
• Total return on $100 = 45% over 3 years

So what: Run your own inputs before you commit — small changes in assumptions can shift the outcome sharply.

Worked examples by asset class

*Leveraged real estate ROI looks high because denominator is down payment, not total property value.

So what: Run your own inputs before you commit — small changes in assumptions can shift the outcome sharply.

ROI examples by asset class (historical ranges)

Past performance does not guarantee future results. Use ranges for planning, not guarantees.

So what: Run your own inputs before you commit — small changes in assumptions can shift the outcome sharply.

Limitations of ROI

ROI does not capture:

• Risk — higher ROI often means higher volatility (crypto vs savings account)
• Inflation — 10% ROI with 4% inflation = 6% real return
• Taxes — capital gains tax reduces net ROI significantly
• Liquidity — can't sell real estate or private equity quickly without cost
• Time value of money — $1,000 in 5 years ≠ $1,000 today (use annualized or NPV)
• Cash flows mid-period — multiple deposits/withdrawals need IRR, not simple ROI

So what: Run your own inputs before you commit — small changes in assumptions can shift the outcome sharply.

Business ROI

For a business project:

ROI = (Net profit from project − Project cost) / Project cost

Include all costs — labour, overhead, opportunity cost of capital.

So what: Run your own inputs before you commit — small changes in assumptions can shift the outcome sharply.

ROI vs IRR vs CAGR

For comparing a 3-year stock gain vs a 7-year property hold, use annualized figures.

So what: Run your own inputs before you commit — small changes in assumptions can shift the outcome sharply.

Common mistakes

1. Simple ROI = (Final value − Initial cost) / Initial cost × 100% — this quietly costs you over time.
2. Annualized ROI adjusts for time — essential when comparing different holding periods..
3. ROI ignores risk, taxes, and inflation unless you adjust for them — this quietly costs you over time.
4. Negative ROI means a loss on the investment — this quietly costs you over time.
5. Use ROI alongside payback period and risk for decisions — this quietly costs you over time.

What to do next

Use our ROI Calculator to model your situation — change one input at a time to see what moves the result most.