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P/S vs P/B: Which Valuation Metric Fits Your Strategy
P/S measures what you pay for a company's revenue. P/B measures what you pay for its net assets. One values the business as a money-making machine. The other values what remains if the company sold everything and paid off its debts.
Both ratios appear on every stock quote page, but they answer different questions. Picking the wrong one for the wrong company gives you a misleading picture of value.
P/S vs P/B at a Glance
| Dimension | P/S (Price to Sales) | P/B (Price to Book) |
|---|---|---|
| Measures | Price relative to revenue | Price relative to net asset value |
| Formula | Market cap / annual revenue | Market cap / (total assets - total liabilities) |
| Works best for | Growth companies, unprofitable businesses | Asset-heavy companies, banks, insurers |
| Blind spot | Ignores profitability and balance sheet | Ignores revenue, growth, and intangibles |
| Low = cheap? | Below 1.0 often signals undervaluation | Below 1.0 means market values less than assets |
| Best for | Spotting fast growers before they earn profit | Finding asset-backed bargains in mature sectors |
What P/S Tells You
P/S ratio divides market cap by annual revenue. It answers: "How much am I paying for each dollar this company brings in?"
P/S shines where earnings-based metrics go dark. A company reinvesting every dollar into growth shows no profit, making P/E useless. P/S still works because revenue exists even when earnings do not.
The limitation: P/S says nothing about whether revenue turns into profit. A company with $1B in revenue and razor-thin margins looks identical to one with $1B and 30% margins.
Example: Two software companies both trade at P/S 3.0. Company A has 25% net margins and growing. Company B has negative margins and is burning cash. Same P/S, completely different investments.
What P/B Tells You
P/B ratio divides market cap by book value (total assets minus total liabilities). It answers: "How much am I paying relative to what this company owns?"
P/B works best where physical assets drive the business. Banks hold loan portfolios and deposits that translate directly into book value. Insurers hold reserves. Manufacturers own equipment and real estate. For these sectors, book value is a meaningful floor: if the company dissolved, shareholders would receive roughly book value.
The limitation: P/B breaks down when value sits in intangible assets. MSFT trades at a P/B above 10 not because the market is irrational, but because its balance sheet understates true worth. Applying P/B to asset-light businesses produces misleadingly high ratios.
Example: A regional bank trades at P/B 0.8. The market values the entire company at less than its net assets. Either it expects losses that will erode those assets, or the bank is undervalued. P/B gives you that signal. P/S would not.
When to Use P/S vs P/B
| Sector | Best metric | Why |
|---|---|---|
| SaaS / Tech | P/S | Revenue grows fast, assets are intangible, P/B misleads |
| E-commerce | P/S | Top-line momentum matters more than book value |
| Biotech | P/S | Pre-profit companies have revenue but no meaningful assets |
| Banks | P/B | Loan portfolios and deposits translate directly to book value |
| Insurance | P/B | Reserves and float make book value a reliable floor |
| REITs | P/B | Property holdings are tangible, well-documented assets |
| Utilities | P/B | Heavy infrastructure creates large, stable book values |
| Manufacturing | Both | Tangible assets plus revenue growth: check both signals |
Use P/S when: The thesis depends on top-line momentum and the company has no earnings or wildly fluctuating margins. P/S is the cleaner lens for growth companies that prioritize revenue over profit.
Use P/B when: Tangible assets are a large share of total value. If you are hunting for companies trading below liquidation value, P/B surfaces those opportunities.
Skip P/S when: The company has high revenue but terrible unit economics. A retailer doing $10B in sales at a 1% margin is not a bargain at any P/S level.
Skip P/B when: The company is asset-light. Applying P/B to a consulting firm or software company tells you almost nothing about fair value.
Using P/S and P/B Together
Neither metric tells the full story alone. Using both reveals patterns that either one misses.
Screen for companies with a low P/S and a reasonable P/B. This combination points toward businesses generating real revenue backed by tangible assets: the market is discounting both the revenue stream and the assets behind it.
When the two disagree, dig deeper. Low P/S with high P/B means fast revenue growth with few tangible assets: typical of tech. Low P/B with high P/S means lots of assets but little revenue per dollar of market cap: common in capital-intensive industries struggling to grow.
Check both alongside other stock fundamentals like profit margin and P/E to build a complete picture.
Open any stock quote page to see P/S and P/B side by side with the rest of the valuation metrics.
Frequently Asked Questions
Can P/S and P/B both be low at the same time?
Yes. When both are low, the market is pricing the company cheaply relative to both revenue and assets. This sometimes signals deep value in out-of-favor sectors. It can also mean the market expects declining sales or asset writedowns. Low ratios are a starting point for research, not a buy signal on their own.
Why do tech stocks have high P/B ratios?
Tech companies are asset-light. Their value comes from intellectual property, software, and network effects: none of which appear at full value on the balance sheet. A company worth $500B with $50B in book value has a P/B of 10, but that does not mean it is overvalued.
Is a P/S below 1.0 always a good sign?
Not always. P/S below 1.0 means the market values the company at less than one year's revenue. But it can also mean the market expects revenue to decline or the business model to fail. Retailers and commodity producers often trade below P/S 1.0 because their margins are structurally thin. Context matters more than the number.
Which metric works better for bank stocks?
P/B is the standard for banks. A bank's assets (loans, deposits, securities) translate directly into book value, making P/B a meaningful measure of what you pay relative to what the bank owns. P/S is less useful because bank "revenue" (net interest income) works differently from product revenue. Most analysts compare P/B across bank peers.