ROI Calculator

What Is Return on Investment (ROI)?

ROI is a simple but powerful metric that measures the profitability of an investment relative to its cost. It answers the fundamental question: “For every dollar I put in, how much did I get back?”

The basic formula is ROI = (Net Profit / Cost of Investment) × 100. An investment that cost $10,000 and returned $13,000 has a net profit of $3,000 and an ROI of 30%.

ROI works for any investment type — stocks, real estate, business equipment, marketing campaigns, education, or even home renovations. Its universality makes it the default metric for comparing very different types of investments.

Key takeaway: ROI is the one metric that lets you compare completely different investments — a rental property vs. a stock portfolio vs. a marketing campaign — on the same scale.

Total ROI vs Annualized ROI

Total ROI has a critical limitation: it doesn’t account for time. A 30% return might sound better than 20%, but what if the 30% return took 10 years and the 20% return took 2 years?

Annualized ROI solves this by converting any total return into an equivalent annual rate: Annualized ROI = (1 + Total ROI)^(1/Years) - 1. The 30% over 10 years becomes 2.7% annualized, while the 20% over 2 years is 9.5% annualized — a dramatically better investment.

Example: A 30% total return over 10 years is just 2.7% annualized, while a 20% return over 2 years is 9.5% annualized. The “smaller” return was actually the far better investment.

Always compare investments using annualized returns to get a fair comparison.

ROI Benchmarks by Asset Class

Different investments carry different risk-return profiles:

Any ROI that consistently beats inflation (3%) is positive in real terms. Returns above 7% are generally considered strong for the level of risk involved.

Tip: Use annualized ROI — not total ROI — when comparing against these benchmarks. A 50% total return sounds great until you realize it took 10 years (just 4.1% annualized).

When to Use This Calculator

Use the ROI calculator when you:

• Evaluate a past investment — enter what you paid and what it’s worth now to see your actual return
• Compare investment options — see which of two or more investments delivered the best annualized return
• Assess a business decision — calculate ROI on equipment purchases, marketing spend, or employee training
• Evaluate real estate — factor in purchase price, rental income, maintenance costs, and current property value

Common Mistakes

1. Ignoring all costs. ROI should include transaction fees, taxes, maintenance, and opportunity costs — not just the purchase price and sale price.
2. Comparing total returns across different time periods. A 50% return over 10 years (4.1% annualized) is worse than 25% over 3 years (7.7% annualized). Always annualize.
3. Forgetting about inflation. A 5% return during 3% inflation is only 2% real ROI. Your purchasing power barely grew.
4. Excluding income from the calculation. Dividends, rent, and interest payments are part of total return and must be included.

Key takeaway: The single biggest ROI mistake is comparing raw totals across different time horizons. Always annualize first, then compare.

What to Do Next

Enter your investment details to see your actual returns. If you’re comparing multiple investments, the annualized return column gives you the clearest picture of which one performed better relative to the time invested.