How to Calculate ROI: Return on Investment Formula and Examples

Author: Finatune

Whether you're evaluating a stock purchase, a real estate deal, a marketing campaign, or a new piece of equipment for your business, you need a way to measure the return. Return on Investment (ROI) is the universal metric that tells you how much profit you've made relative to what you invested.

The ROI Formula

The basic ROI formula is simple:

ROI = ((Current Value — Cost of Investment) ÷ Cost of Investment) × 100

This gives you a percentage that represents your total return, positive or negative.

ROI Example

You invest $10,000 in a small business. Two years later, you sell your stake for $14,000:

ROI = (($14,000 — $10,000) ÷ $10,000) × 100 = 40%

You earned a 40% total return on your investment over two years.

Annualized ROI

The basic ROI doesn't account for time, which makes it hard to compare investments held for different periods. Annualized ROI solves this:

Annualized ROI = ((1 + ROI)^(1/n) — 1) × 100

Where n is the number of years. Using the example above:

Annualized ROI = ((1 + 0.40)^(1/2) — 1) × 100 ≈ 18.3%

A 40% return over 2 years is roughly equivalent to 18.3% per year.

Comparing Investments With ROI

ROI lets you compare completely different investments on equal footing:

• Stock market (S&P 500): Historical average ~10% per year
• Real estate: Typically 8%–15% per year including appreciation and rental income
• Business ownership: Highly variable, but successful small businesses can return 20%+
• Bonds: Lower risk, lower return — 3%–6% per year
• Education/certification: ROI depends on salary increase; often 20%–50% per year

ROI Limitations

ROI is powerful but has blind spots:

• Doesn't account for risk: A 20% ROI on a stable index fund is very different from 20% on a crypto startup
• Doesn't include time value of money: Annualized ROI helps, but consider inflation too
• Ignores liquidity: A high ROI is less valuable if you can't access your money for years

Use Our ROI Calculator

Our ROI calculator computes both total and annualized ROI instantly. Enter your initial investment, final value, and time period to get a clear picture of your returns. For longer-term investments, pair it with our compound interest calculator to understand how compounding affects your wealth over time.

Conclusion

ROI is the most versatile tool in your financial analysis toolkit. Use it to evaluate any investment decision, but always consider risk, time horizon, and liquidity alongside the raw percentage.