Opening a demat account is the easy part. The harder part is figuring out which stocks are actually worth your money and which ones just look attractive because the price seems low.
Here’s something that catches most new investors off guard: a stock trading at ₹50 can be far more expensive than one trading at ₹500. Price alone tells you almost nothing. What matters is what you’re getting for that price, the profits behind it, the assets backing it, the debt sitting on top of it. Stock market ratios are the tools that make this comparison possible without having to read through a hundred pages of financial reports every time.
Think of them as shortcuts to the most important questions. Let’s walk through the ones that matter most.
Price-to-Earnings (P/E) Ratio: What Are You Paying for Each Rupee of Profit?
This is the ratio most people hear about first, and for good reason. The P/E ratio tells you how much the market is willing to pay for every rupee a company earns.
The formula is simple: divide the current share price by earnings per share (EPS). If a company’s share trades at ₹300 and its EPS is ₹15, the P/E ratio is 20. Investors are effectively paying ₹20 for each ₹1 of annual profit.
A high P/E usually means the market expects strong future growth, investors are paying a premium for what they believe is coming. A low P/E can mean the market is skeptical, or sometimes that the stock is genuinely undervalued. Neither is automatically good or bad.
The catch: earnings can be distorted. A one-time asset sale or an extraordinary gain can temporarily inflate profits and make the P/E look lower than it really is. Always check whether the earnings behind the ratio are clean and recurring.
Price-to-Book (P/B) Ratio: How Does the Price Compare to What the Company Actually Owns?
Where the P/E looks at earnings, the P/B ratio looks at net worth. It compares the share price against the book value per share, essentially what the company’s assets are worth after subtracting all its liabilities.
ROE is calculated as the share price divided by the book value per share.
A P/B below 1 means you’re buying the stock for less than the company’s recorded net assets, which can signal undervaluation, or it can signal trouble (the market may know something the balance sheet hasn’t reflected yet). A higher P/B means investors are paying a premium above the book value, which is common for companies with strong earnings power and brand value.
This ratio works best for asset-heavy businesses, banks, manufacturing companies, infrastructure firms. For technology or service companies where most of the value is intangible (brand, intellectual property, talent), book value often understates the real picture.
Return on Equity (ROE): Is the Company Making Good Use of Investor Money?
Profitability ratios shift the focus from price to performance. Return on Equity (ROE) is considered one of the most important ratios for financial analysis.
It measures how much profit a company generates from the money shareholders have put in. Formula: net profit after tax divided by average shareholders’ equity, expressed as a percentage.
A company earning ₹20 crore on ₹100 crore of equity has an ROE of 20%. That’s generally a strong number, though what counts as strong varies by industry.
One thing to watch: ROE can be inflated by high debt. When a company borrows heavily, it reduces the equity base, which mathematically pushes ROE higher, even if the underlying business isn’t performing well. Always look at the debt-to-equity ratio alongside ROE to understand whether the profitability is genuine or leverage-driven.
Net Profit Margin: How Much Actually Stays After All the Bills Are Paid?
Revenue growth gets all the headlines. Net profit margin tells you the part that actually matters, how much of that revenue survives after expenses, interest payments, and taxes.
Formula: net profit divided by total revenue, multiplied by 100.
A company reporting ₹500 crore in revenue with ₹50 crore in net profit has a 10% margin. Whether that’s good depends heavily on the industry, grocery retail operates on thin margins by nature, while software businesses can sustain much higher ones.
What you’re really watching here is the trend. A margin that’s been gradually shrinking over three or four years is a red flag, even if the absolute number still looks acceptable. It usually means rising costs, pricing pressure, or both.
Debt-to-Equity Ratio: How Much Has the Company Borrowed?
ROE plays a central role in assessing the financial health of a company. It compares total borrowings to shareholders’ equity and tells you how dependent the business is on debt to fund itself.
Formula: total debt divided by total equity.
A ratio of 1 means the company has borrowed exactly as much as its equity base. Higher than that, and debt is outweighing owner funds, which isn’t necessarily dangerous, but it does mean interest costs become a real burden if business slows down. Capital-intensive sectors like steel or telecom naturally carry more debt than, say, an IT services firm.
The key question isn’t just how much debt exists, but whether the company generates enough cash to service it comfortably.
Current Ratio: Can the Company Pay Its Short-Term Bills?
The current ratio measures near-term liquidity, whether a company has enough short-term assets to cover its short-term obligations.
Formula: current assets divided by current liabilities.
A ratio above 1 means the company has more coming in (in the near term) than going out. Below 1 raises questions about whether it can meet its obligations without borrowing more. That said, a very high current ratio isn’t always a sign of health, it might mean cash is sitting idle instead of being deployed productively.
One important nuance: not all current assets are equal. Inventory takes time to sell. Receivables take time to collect. Cash is immediate. The composition of those current assets matters as much as the number itself.
Using These Ratios Together
No single ratio tells the full story. A low P/E with a deteriorating profit margin is a warning, not a bargain. A high ROE driven by too much debt is less meaningful and can be misleading. Strong liquidity means little if the business isn’t profitable.
The ratios are most useful when read together, tracked over multiple years, and confirmed against the actual financial statements. For anyone who has just opened a demat account, building this habit early, looking beyond the price to the numbers behind it, is one of the more valuable things you can do for your investment process.
Frequently Asked Questions
1. Which ratio should a beginner look at first?
Start with the P/E ratio to understand valuation, then check net profit margin to see whether the earnings behind that ratio are solid. These two together give a reasonable starting point for most listed stocks.
2. Is a low P/E ratio always a buying signal?
Not at all. A low P/E can reflect genuine undervaluation, or it can reflect the market’s justified skepticism about future earnings. Always check what’s driving the earnings figure before drawing conclusions.
3. What is a healthy debt-to-equity ratio?
It varies by industry. As a rough guide, a ratio below 1 is considered conservative for most sectors. Capital-intensive industries naturally carry higher ratios, so always compare within the same sector rather than against a fixed universal benchmark.
4. How often should I check these ratios?
Quarterly results give you fresh data to update your reading. An annual review comparing ratios over three to five years is more useful than reacting to every quarterly shift.
5. Can ratios alone tell me whether a stock is a good investment?
No. Ratios are a structured starting point, not a complete answer. Business quality, management track record, competitive position, and broader market conditions all matter too. Ratios help narrow down stocks to those worth deeper analysis.
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