When you analyse companies listed on the National Stock Exchange (NSE) or BSE, choosing the right valuation framework can be the difference between spotting a genuine multi-bagger and falling into a costly value trap.
Two of the most widely used metrics in equity research are the Price-to-Earnings (P/E) ratio and the Price-to-Book (P/B) ratio. Applied to the wrong sector, either can give a misleading answer. This guide explains how each ratio works, which sectors it suits, how they compare, and what history says about the Nifty 50.
1. How the Price-to-Earnings (P/E) ratio works
The P/E ratio tells you how much the market is willing to pay for every rupee of net profit a company earns.
P/E ratio = Current market price per share ÷ Earnings per share (EPS)
where EPS = (Net profit after tax − Preference dividends) ÷ Weighted average shares outstanding
Two common versions of P/E
- Trailing twelve months (TTM) P/E: uses reported earnings from the last four quarters. It avoids guesswork but can lag when earnings are turning around quickly.
- Forward P/E: uses estimated earnings for the next financial year. It is useful for fast-growing businesses but only as good as the forecast behind it.
Where P/E works best
P/E is most useful for asset-light, consumer-facing or recurring-revenue businesses with steady, visible earnings:
- FMCG: companies such as Hindustan Unilever and Nestlé India usually trade at high P/E multiples because of strong brands, high returns on capital and consistent cash flows.
- Information technology: firms such as TCS and Infosys need little capital spending, so net profit is a reasonable stand-in for the cash the business generates.
- Pharmaceuticals and healthcare: works well for mature pharma companies with predictable domestic sales.
2. How the Price-to-Book (P/B) ratio works
The P/B ratio compares a company’s market value with the net worth recorded on its balance sheet.
P/B ratio = Current market price per share ÷ Book value per share (BVPS)
where BVPS = Total shareholders’ equity ÷ Shares outstanding = (Total assets − Total liabilities) ÷ Shares outstanding
Where P/B works best
P/B matters most in capital-heavy sectors, where physical or financial assets drive income:
- Banks and NBFCs: for a lender, loans and investments are the business. Profits swing with provisioning cycles, so P/E can mislead. Analysts use Price-to-Adjusted Book Value (P/ABV), which deducts net non-performing assets (NPAs) from book value.
- Capital goods, infrastructure and real estate: companies with large property, plant and equipment are judged against the assets behind them.
- Cyclical commodities (steel, cement, chemicals): at the bottom of a cycle, profits can fall close to zero and push P/E very high, while the asset base stays intact. P/B gives a steadier reference point.
3. P/E vs P/B: head-to-head comparison
| Dimension | Price-to-Earnings (P/E) | Price-to-Book (P/B) |
|---|---|---|
| Based on | Income statement (net profit) | Balance sheet (net worth) |
| Best suited to | FMCG, IT, consumer discretionary, pharma | Banks, NBFCs, infrastructure, metals, real estate |
| Main limitation | Distorted by one-off gains and accounting changes | Ignores intangible assets such as brands, patents and software |
| Through a business cycle | Spikes when earnings collapse | Stays relatively stable |
| Pair it with | PEG ratio (P/E to growth) | Return on equity (ROE) |
A practical rule: a high P/B is only justified by a high ROE. A bank earning 18% on its equity deserves a higher P/B than one earning 9%. For how ROE works, and why it can be inflated by debt, see our ROE vs ROCE guide.
4. Historical context: Nifty 50 valuation ranges
Index-level multiples help you judge whether the broad market is cheap or expensive. Approximate Nifty 50 ranges over 2015–2025:
| Metric | Cheaper zone | Around the median | Expensive zone |
|---|---|---|---|
| Nifty 50 P/E | about 18x | about 22.5x | 28x and above |
| Nifty 50 P/B | about 2.8x | about 3.5x | 4.5x and above |
These are rough bands, not buy or sell signals. Two cautions when comparing numbers:
- The earnings basis changed. From April 2021, NSE began calculating the Nifty 50 P/E on consolidated earnings instead of standalone earnings, which lowered the reported P/E. Compare figures calculated on the same basis.
- Standalone vs consolidated matters for companies too. For groups with large subsidiaries, standalone and consolidated earnings can give very different multiples. Use consolidated figures for diversified groups.
To see these ratios applied to a real issue, our Jio IPO valuation breakdown walks through its P/E and P/B at the offer price.
5. Frequently asked questions
Can a stock have a negative P/E or P/B ratio?
A company that reports a net loss over the last twelve months has a negative P/E. Most financial websites show this as “N/A” because a negative multiple is meaningless for comparison.
A negative P/B happens when total liabilities exceed total assets, meaning the company’s net worth has been wiped out. It is a sign of serious financial distress or accumulated losses larger than the share capital.
Why do IT and FMCG stocks trade at high P/E multiples in India?
IT and FMCG companies run asset-light balance sheets with high return on capital employed (ROCE) and return on equity (ROE). They don’t need heavy reinvestment in factories or equipment to grow, so much of their profit turns into free cash flow. Investors pay a premium for that cash conversion, pricing power and steady dividends.
What is the PEG ratio, and how does it improve on P/E?
The Price/Earnings-to-Growth (PEG) ratio adjusts P/E for expected earnings growth:
PEG ratio = P/E ratio ÷ Annual earnings growth rate (%)
A stock at a P/E of 30 may look expensive on its own. If its profit is growing 30% a year, its PEG is 1.0. As a rough guide, a PEG below 1 can point to growth that the price hasn’t fully reflected, while a PEG above 1.5–2 can suggest the price has run ahead of growth. The ratio is only as reliable as the growth estimate behind it. For how PEG fits into a wider toolkit for smaller companies, see our guide to valuing small-cap and mid-cap stocks.
Why is P/B preferred over P/E for Indian banks and NBFCs?
Bank profits can swing sharply with loan-loss provisions, NPA write-offs and interest-rate changes. A bank’s main asset is its loan book, and its net worth is the cushion that supports those loans. That is why analysts use Price-to-Adjusted Book Value (P/ABV), which subtracts net NPAs from book value to show the real equity backing the business.
What are the common value traps with low P/E or low P/B stocks?
- Low P/E trap: the P/E may look low because of a one-time gain, such as an asset sale, or because the company is in a declining industry where profits are about to fall.
- Low P/B trap: a stock trading below 1x book may look cheap, but its balance sheet may carry impaired assets, obsolete inventory or bad receivables that haven’t been written down yet.
A useful cross-check for both traps is cash flow: profits that don’t turn into cash are a warning sign. Our guide to free cash flow explains how to check this.
The bottom line
Neither ratio is “better” on its own. Use P/E for businesses whose value comes from steady earnings, such as FMCG, IT and pharma. Use P/B (or P/ABV) for businesses whose value sits on the balance sheet, such as banks, NBFCs and cyclicals. Then check each against a companion metric: PEG for P/E, and ROE for P/B.
Companies and indices named in this article are examples for education only and are not recommendations to buy or sell any security.
Please note: This article is for educational purposes only. Nothing here is a recommendation to buy or sell any security, IPO or investment. Do your own research and read all related documents carefully before investing. Disclosures