Price-to-Book (PB) ratio answers a different question than PE. Instead of "what am I paying for this company's profit?", it asks "what am I paying for what this company actually owns, on paper?"
PB Ratio is calculated as:
Book value per share is, roughly, what would be left over per share if the company sold every asset it owns and paid off every debt and liability — the accounting "net worth" of the business, divided across its shares.
If a company's share trades at ₹300, and its book value per share is ₹150, the PB is 2. You're paying ₹2 for every ₹1 of the company's accounting net worth.
A PB of exactly 1 means the stock trades at precisely its book value — you'd be paying exactly what its assets are worth on paper, no more, no less. This is precisely why PB is sometimes called a "hard floor" valuation check — in a genuine worst case, book value is roughly what a shareholder might expect back if the company were wound up and its assets sold off, though that assumption rarely holds perfectly in practice.
PB is most meaningful for businesses whose value genuinely comes from what they own — physical assets, loans on their books, real estate, inventory. For these businesses, book value is a reasonably solid anchor: it's grounded in something real and auditable, not just market sentiment or growth hopes.
Banks are the clearest example. A bank's core business is holding assets (loans) and liabilities (deposits) — its book value is a direct, meaningful reflection of what the business actually is. This is why bank stocks are conventionally valued using PB far more than PE.
A high PB isn't automatically a red flag — it often just means book value is the wrong lens for that kind of company in the first place.
PB is most useful for:
PB is far less useful for asset-light, brand- or knowledge-driven businesses — a software company's most valuable "asset" is often its code, talent, and customer relationships, none of which show up meaningfully on a balance sheet. Judging such a company on PB alone will make it look permanently, misleadingly expensive.
Just as with PE, a normal PB ratio in India varies substantially across industries, and reading PB against a single fixed number misses this entirely:
As with PE, the sector comparison matters more than the absolute number. A PB of 4 is unremarkable for a strong consumer brand and would be a striking, hard-to-justify figure for a mid-tier PSU bank.
Standard book value includes everything on the balance sheet, goodwill and other intangible assets among them. Tangible book value strips these out, leaving only physical and financial assets minus liabilities — a more conservative, harder-edged number.
This matters most for companies that have grown through acquisition. When one company buys another for more than the target's own book value, the difference is recorded as goodwill — an accounting entry, not a physical or financial asset. A company with a large amount of goodwill on its books can show a respectable standard PB while its tangible PB (price divided by tangible book value per share) tells a noticeably less flattering story.
Comparing both figures side by side is a quick way to see how much of a company's stated net worth is genuinely tangible, and how much is an accounting artifact of past acquisitions.
PB and ROE aren't just conceptually related — there's a practical rule of thumb for sanity-checking whether a given PB is actually earned. Roughly speaking, a business generating an ROE meaningfully above its sector's typical return can justify a PB above 1 in rough proportion — a company earning 20% ROE justifying a materially higher PB than one earning 8%, all else equal.
The useful check this enables: if two companies in the same sector trade at a similar PB but one has a distinctly higher ROE, the higher-ROE company is arguably the better-priced of the two — you're paying roughly the same multiple of book value for a business generating meaningfully better returns on that same book. Conversely, a company trading at a high PB with only middling ROE is the combination most worth questioning.
"Suryoday Trust Bank" (illustrative) trades at ₹180 per share, with a book value per share of ₹120.
For a well-run, profitable bank, a PB of 1.5 is a fairly standard, unremarkable valuation — investors are paying a modest premium over book value, reflecting reasonable confidence in the quality of its loan book and its ability to keep generating a decent return on it.
"Coastal Steel Works" (illustrative) trades at a PB of 0.6 — seemingly a bargain, well below book value.
Before assuming this is undervalued, the real question is why the market is pricing it below book. It could genuinely be an overlooked opportunity. It could also mean the market believes a meaningful chunk of the company's reported assets — old machinery, slow-moving inventory, receivables that may never be collected — aren't really worth what the balance sheet says they are. A low PB is a prompt to dig into what's actually on that balance sheet, not a reason to buy on its own.
"Lakeside Life Insurance" (illustrative) trades at a PB of 3.2 — well above what would look reasonable for a bank or an industrial company.
Insurance companies are a case where a straightforwardly high PB can still be entirely justified. Life insurers in particular are often valued closer to "embedded value" — the present value of future profit from policies already sold — rather than raw accounting book value, since a large share of an insurer's real worth sits in future cash flows that book value doesn't capture at all. A PB that would be alarming for a bank can be unremarkable for an insurer with a large, high-quality book of in-force policies.
No. It's often the market signaling real doubt about the stated value of the company's assets. Worth investigating carefully, never buying on the number alone.
Because book value only captures physical and financial assets — it systematically excludes brand value, customer relationships, and intellectual property, which is often where an asset-light company's real worth lies.
Neither is universally "more reliable" — they measure different things and suit different kinds of businesses. PB tends to be more grounded for asset-heavy businesses; PE tends to be more informative for profit-driven, asset-light ones.
Tangible book value excludes goodwill and other intangible assets from standard book value, leaving a more conservative figure. Comparing a company's regular PB to its tangible-book-value PB shows how much of its stated net worth is genuinely physical or financial versus an accounting artifact of past acquisitions.
Insurers, particularly life insurers, are often valued closer to "embedded value" — the present worth of future profit from policies already written — than to raw accounting book value, since a large share of a life insurer's real economic worth isn't captured on the balance sheet at all.
Yes, and this is actually one of PB's practical advantages over PE — since it's based on the balance sheet rather than profit, PB remains calculable and meaningful even for a company currently reporting a loss, where PE would be unusable.
Classic value-investing approaches have historically favored a PB below roughly 1.5, though this framework works best for asset-heavy sectors — applying the same threshold to an asset-light business would rule out most genuinely good companies in that category entirely.
No. A stock split changes the share price and book value per share by the same proportion, so the PB ratio itself is unchanged — only the number of shares outstanding and the per-share figures move, not the underlying relationship between them.
PB contributes to the Valuation pillar alongside PE, EV/EBITDA, and PEG — with its weight adjusted by sector, since PB matters far more for some industries than others. See How Our Scores Work for the full picture.