Recently, a friend asked me how to calculate return on investment (ROI), and I realized that although this concept seems simple on the surface, many people don’t actually understand it deeply enough. Today, let’s talk about this topic.

ROI is return on investment—also known as the investment return rate. Put simply, it means how much profit your invested money can generate for you. The calculation method is quite straightforward: (Net Profit − Investment Cost) / Investment Cost, and then multiplied by 100% to express it as a percentage. For example, if you buy stocks with 1 million dollars and later sell them for 1.3 million dollars, your ROI is 30%. While the concept is simple, its application scenarios are especially broad—from personal financial management to evaluating company finances.

Here’s a more complex example. Suppose you buy 1,000 shares of stock at $10 per share. After one year, you sell them at $12.5 per share and also receive $500 in dividends, with transaction fees of $125. How do you calculate the ROI accurately in this case? You need to account for all income and costs. Total income is the money from selling the stock plus the dividends: 12,500 + 500 = $13,000. Total cost is the initial purchase price plus the fees: 10,000 + 125 = $10,125. So net profit is $2,875, and ROI is $2,875 divided by $10,000, which is about 28.75%.

But there’s an important distinction that must be clarified here. In the advertising industry, people often say ROI, but many times they’re not referring to true ROI—instead, they mean ROAS (return on ad spend). ROI measures profit, while ROAS measures revenue. For example, if the cost of a product is $100 and the selling price is $300, and you sell 10 units through advertising with an ad spend of $500, the true ROI is (3,000 − 1,000 − 500) / 1,500, which equals 100%. But ROAS is 3,000 divided by 500, which equals 600%. The difference is quite significant.

There’s also an upgraded version called annualized return on investment. The problem with basic ROI is that it doesn’t consider time. If Project A earns 100% in 2 years and Project B earns 200% in 4 years, then looking only at ROI, B seems better. But in reality, A has a better annualized return. Using the formula, A’s annualized return is 41.4%, while B’s is only 31.6%. So choosing A is more cost-effective.

Many people also mix up ROI, ROA, and ROE. Simply put, ROI is the return on invested capital; ROA is the return on total assets; and ROE is the return on shareholders’ equity. These three indicators measure profitability from different angles.

To improve ROI, there are basically two ways: increase profit or reduce costs. But in reality, both of these approaches have limited effectiveness. The most direct approach is choosing investment targets with a high ROI. Generally speaking, the ROI for cryptocurrencies and foreign exchange tends to be higher than that of stocks; stocks are higher than indices and funds; and bonds are the lowest. But remember: high ROI usually comes with high risk. You can’t just look at the return rate—you also need to consider other indicators such as volatility and valuation.

Common high-yield investment methods include several types. CFD trading attracts quite a few short-term traders because its leverage is lower and operations are flexible. The foreign exchange market has the largest trading volume, and returns sometimes can exceed 30%, but the risk is also high and you need experience. Gold, as a safe-haven asset, has long been popular. Although the stock market is relatively stable, the long-term average annual return in the US can be 12% or more.

Finally, a reminder: although ROI is widely used, it has clear limitations. First, it doesn’t consider the time factor—when the same ROI figure is achieved over different time periods, the actual returns can differ greatly. Second, a high ROI often means high risk. If you only focus on the ROI number and ignore risk, you may end up with nothing left. Also, when calculating ROI, costs are easy to omit—for example, real estate investments need to account for interest, taxes, insurance, maintenance, and more, all of which can consume a significant portion of the returns. Lastly, ROI looks only at financial gains and ignores social and environmental benefits, which is why some people have proposed a new concept: social return on investment, to assess investment value more comprehensively.

In summary, understanding how to calculate ROI is just the first step. More importantly, you need to learn how to evaluate things comprehensively and not be fooled by high ROI.