What Is ROI?

Return on Investment (ROI) is a performance metric used to evaluate the efficiency or profitability of an investment. It measures the return relative to its cost, expressed as a percentage. ROI is one of the most widely used financial metrics in business because it is simple, universal, and directly comparable across different types of investments.

Whether you are evaluating a marketing campaign, a new piece of equipment, a hiring decision, or a real estate purchase, ROI gives you a single number that answers the fundamental question: Was this worth it?

The Basic ROI Formula

ROI = (Net Profit / Cost of Investment) × 100

Where Net Profit = Revenue Generated − Cost of Investment.

For example, if you invest $10,000 in a marketing campaign and it generates $15,000 in revenue, your net profit is $5,000 and your ROI is 50%. For every dollar you spent, you got $1.50 back — a 50-cent profit per dollar invested.

Simple ROI vs. Annualized ROI

Simple ROI does not account for time. A 50% ROI over 10 years is very different from a 50% ROI in 6 months. When comparing investments with different time horizons, you need annualized ROI (also called CAGR — Compound Annual Growth Rate).

Annualized ROI = ((Ending Value / Beginning Value)^(1/Years)) − 1

For example, a $10,000 investment that grows to $15,000 over 3 years has a simple ROI of 50%, but an annualized ROI of only 14.5% per year. This is the number you should use when comparing to other investments like stocks, bonds, or real estate.

ROI for Common Business Decisions

Marketing ROI: Track revenue attributable to a specific campaign divided by campaign cost. Be careful to use net profit, not gross revenue. A campaign that generates $20,000 in sales but costs $18,000 in ad spend and $5,000 in product costs has a negative ROI.

Equipment ROI: Calculate the labor savings, productivity gains, or additional revenue the equipment enables over its useful life, then compare to the purchase price plus maintenance costs.

Hiring ROI: Estimate the revenue or cost savings a new employee will generate, subtract their total compensation (salary, benefits, training), and divide by total compensation cost.

Real Estate ROI: Include rental income, appreciation, tax benefits, and subtract mortgage payments, maintenance, insurance, and vacancy costs for a complete picture.

Common ROI Mistakes to Avoid

  • Ignoring time: Always use annualized ROI when comparing investments of different durations.
  • Forgetting hidden costs: Include labor, maintenance, overhead, and opportunity cost.
  • Confusing revenue with profit: ROI is based on NET profit, not gross revenue.
  • Ignoring risk: A 20% ROI with high risk may be worse than a 12% ROI with low risk. Adjust for risk when comparing options.
  • Short-term thinking: Some investments have negative short-term ROI but strong long-term returns (e.g., brand building, employee training).

What Is a Good ROI?

There is no universal "good" ROI — it depends entirely on the investment type, time horizon, and risk level. As a general benchmark, the S&P 500 has historically returned about 10% per year. Any investment should be compared to this opportunity cost. A business investment returning 15% annually is good. One returning 5% annually may not be worth the effort compared to simply investing in index funds.

Calculate Your ROI

Use our free ROI Calculator to calculate both simple ROI and annualized CAGR for any investment. Enter your initial investment, final value, and time period for instant results with a full breakdown.