10 Financial Ratios Every Investor Must Know Before Buying a Stock (2026 Guide)
Many investors buy stocks based on tips, news, social media or short-term price movements. But before investing your money, one question matters: What do the numbers say about the company? According to Sushil Alewa, SEBI Registered Research Analyst (INH100009433), MBA and CFP, investors should look beyond market tips and understand a company’s financial strength, valuation, profitability and risk. Financial ratios make this easier by converting financial-statement numbers into simple, comparable measures. They help investors judge whether a stock looks expensive, assess business profitability, and understand debt and liquidity. If you want to learn the basics of financial markets before going deeper into analysis, explore ISFM’s Stock Market Course. 1. P/E Ratio — Price-to-Earnings Tip: Compare P/E with industry peers and the company’s historical average. 2. P/B Ratio — Price-to-Book A low P/B isn’t automatically cheap; it can also reflect poor asset quality or weak profitability. 3. PEG Ratio 4. ROE — Return on Equity 5. ROCE — Return on Capital Employed For a deeper understanding of company financials, profitability and valuation, explore ISFM’s Fundamental Analysis Course. 6. Net Profit Margin 7. Debt-to-Equity Ratio 8. Interest Coverage Ratio 9. Current Ratio 10. Quick Ratio How to Use These 10 Ratios Together Never judge a stock using just one ratio. Use a simple framework: Most importantly, examine 5–10 years of financial data, not just the latest quarter. Once you understand fundamental analysis, technical analysis can help you study price trends, support and resistance, momentum and potential entry and exit levels. Learn more through ISFM’s Technical Analysis Course. Investors interested in derivatives can also explore the Options Trading Course to understand options strategies, Greeks, volatility and risk management. For a more comprehensive learning path covering fundamental analysis, technical analysis, derivatives and other market concepts, consider ISFM’s Chartered Stock Trading Expert (CSTX) Course. Common Mistakes Investors Make Avoid these mistakes: Financial ratios should always be combined with business quality, management, competitive position, cash flows and industry conditions. Conclusion These 10 financial ratios every investor must know provide a practical framework for evaluating a company’s valuation, profitability, debt and liquidity. There is no magic ratio that guarantees a successful investment. Instead, compare the company’s numbers with its peers, historical performance and business fundamentals. Before buying a stock, ask yourself one simple question: “Do the numbers support the story?” If they do, you are investing with your eyes open—not simply following a tip.
