Recently, many people have asked me how to calculate ROI. I’ll go ahead and explain it thoroughly so the question is completely clear. ROI (Return on Investment) is simply the percentage of profit you make from the money you invest. It sounds straightforward, but there are plenty of traps in real-world use.

Let’s start with the most basic formula: **ROI = (Net Profit ÷ Invested Capital) × 100%**. Net profit is your total income minus total costs. For example, if you buy stocks for $1,000,000 and sell them for $1,300,000, your ROI is 30%. It sounds easy, but in reality, the composition of income and costs is far more complicated than that.

Take stocks as an example. Suppose you buy 1,000 shares at $10 per share. After one year, you sell them at $12.5 per share, and you also receive $500 in dividends. You pay $125 in transaction fees. At this point, total income is $12.5 × 1,000 + $500 = $13,000, total cost is $10 × 1,000 + $125 = $10,125, and net profit is $2,875. The final ROI is $2,875 ÷ $10,000 = 28.75%.

However, in advertising and e-commerce, the “ROI” people mention often refers to a different concept. For example, if the cost of a product is $100, the selling price is $300, you sell 10 units through advertising, and the advertising expense is $500, then ROI is **(300 × 10 − (100 × 10 + 500)) ÷ (100 × 10 + 500) = 100%**. But you’ll find that many industry professionals are not actually referring to ROI—they mean **ROAS (Return on Ad Spend)**. The calculation is **revenue ÷ ad cost**. Using the same example, ROAS becomes **(300 × 10) ÷ 500 = 600%**. The key difference is that ROI calculates profit, while ROAS calculates revenue.

There’s also an advanced concept called **annualized ROI**, which solves the problem that ordinary ROI ignores time. Suppose Plan A has a total return rate of 100% over 2 years, and Plan B has a total return rate of 200% over 4 years. At first glance, B seems to make more money, but annualizing it gives different results. A’s annualized ROI is **(1 + 1)^(1/2) − 1 = 41.4%**; B’s is **(2 + 1)^(1/4) − 1 = 31.6%**. So A is actually the better deal. This is why, when comparing investments, annualized ROI is more valuable as a reference than total ROI.

At the company level, ROI has close relatives: **ROA (Return on Assets)** and **ROE (Return on Equity)**. ROI measures the profit rate of a company’s invested capital. ROA measures the profit rate generated from all assets (including borrowed money). ROE measures the profit rate generated from shareholders’ own funds. Consider this example: a company has assets worth $1,000,000, of which $500,000 is borrowed and $500,000 is provided by shareholders. If it invests $100,000 into a project and recovers $200,000, then that project’s ROI is 100%. If the company earns $1.5 million in profit for the year, ROA is 150%, and ROE is 300%.

Want to improve your ROI? There are basically two ways: increase profit or reduce costs. For stocks, for example, you can choose dividend-paying stocks, find brokers with lower fees, and reduce trading frequency. But honestly, these optimizations have limited impact. The most direct approach is to choose assets with higher ROI. Generally speaking, cryptocurrency and forex tend to have the highest ROI, followed by stocks, then indices and funds, with bonds being the lowest. Of course, higher ROI often comes with higher risk, so when choosing, you need to balance it with other indicators such as volatility and valuation.

When it comes to high-ROI investment strategies, **CFD** contracts are a popular choice for many people. They are easy to operate and require a low margin. For example, in stocks, CFDs may only require a 20% margin to trade. Suppose you have $10,000—you only need $2,000 to trade. If you earn $500, your ROI reaches 25%. The forex market is also attractive: it has the largest trading volume in the world, returns sometimes exceed 30%, and it operates 24 hours a day, allowing for profits in both directions. But forex is heavily influenced by the international environment, and it demands a lot of experience from investors. Gold is a classic safe-haven tool—**in 2019 it rose 18.4%**. US stocks are a relatively mature option, with an average annual ROI of over 12% across more than 200 years.

But one thing to remind you: although ROI is useful, it has clear limitations. First, it doesn’t consider time. Project X has an ROI of 25%, while Project Y is 15%, but if X takes 5 years to earn the returns and Y takes only 1 year, then you obviously can’t simply compare them. Second, high ROI usually comes with high risk. If you only watch the ROI number and ignore risk, you may ultimately lose money. Third, ROI is easy to be overestimated because calculations often omit some costs. For example, for real estate investments, you need to consider mortgage interest, property taxes, insurance, maintenance fees, and more—if you don’t include them, the ROI will be inflated. Finally, ROI looks only at financial returns and ignores non-financial gains such as social or environmental benefits.

In summary, ROI is a very practical metric, but when using it you should combine it with annualized ROI, risk assessment, valuation analysis, and other dimensions to make more rational investment decisions. Don’t let the numbers of high ROI blind you—risk management is the key to long-term profitability.