Price-to-sales ratio (P/S): formula, examples and how to read it

The price-to-sales ratio (P/S) tells you how many dollars investors are paying for each dollar of a company's yearly revenue. It is the bluntest of the common valuation multiples: it ignores costs, taxes and debt entirely and looks only at the top line of the income statement. That bluntness is both its weakness and the reason people keep using it.

Revenue is hard to fake and rarely negative. A young software company burning cash, a cyclical manufacturer in a bad year, or a biotech with its first product on the market may have no earnings to put under a P/E ratio, but they all have sales. P/S lets you put a number on what the market is paying for those businesses anyway.

This page shows the formula two ways using Apple's fiscal 2025 numbers, explains how to connect P/S back to profit margins (and why that connection is the most useful thing to know about it), and compares Apple with Microsoft and Alphabet.

What the price-to-sales ratio measures

Every listed company has a market value: the share price times the number of shares outstanding, its Market capitalization: formula, free float and enterprise value. P/S divides that value by the revenue the company booked over the last fiscal year (or the trailing twelve months). The answer is a multiple: "the market values this company at nine times its sales."

Read the other way round, a P/S of 9 means that if you bought the whole company at today's price, its annual revenue would equal about 11% of what you paid. That is not a return — revenue still has to pay suppliers, staff, tax collectors and lenders — but it gives a sense of scale that does not depend on accounting choices further down the income statement.

Two ways to compute it

The two versions give the same answer as long as you use the same share count in both. The whole-company version is easier when you already have a market cap; the per-share version is handy when you are looking at a quote screen.

A small trap: if you use the diluted weighted-average share count from the income statement (15,004.697 million) for sales per share but the year-end count for market cap, you get a slightly different number ($27.74 of sales per share, P/S 9.21). Neither is wrong; the point is to be consistent and to know which count a data provider used.

Why P/S exists: valuing companies without profits

P/E needs positive earnings. When net income is zero or negative, the ratio is meaningless, and when earnings are tiny it explodes into the hundreds. That happens more often than beginners expect:

• Early-stage growth companies spend heavily on sales and research before they reach scale, so they report losses for years.
• Cyclical companies — chipmakers, automakers, airlines — can swing from large profits to losses within one cycle, while revenue moves far less.
• Turnarounds often carry one-time charges that wipe out earnings for a year.

In all three cases revenue is still a meaningful measure of how big the business is. P/S lets an analyst ask: if this company eventually earns margins like its mature peers, what is the market already paying for that?

The link to margins: P/S ÷ net margin ≈ P/E

The single most useful idea about P/S is that it is P/E with the margin hidden inside. Because net income = revenue × net margin, the algebra is short:

This identity is why a P/S of 9 can be reasonable for one company and extreme for another. A business with a 27% net margin at 9 times sales is priced at about 34 times earnings. A grocery chain with a 2% net margin at 9 times sales would be priced at 450 times earnings. The P/S is identical; the economics are not.

So when you see a high P/S, the next question is always: what margin does the market expect this company to earn, and is that plausible? Margin-adjusted thinking turns P/S from a blunt number into a question about the future (see Profit margins: gross, operating and net margin explained).

Apple against its peers

On March 31, 2026 the three companies traded at similar sales multiples: Apple 9.2, Microsoft 9.8 and Alphabet 8.7. These use each company's latest full fiscal year and a market cap built from the closing price times diluted weighted-average shares (for Apple, $253.79 × 15,004.7M ÷ $416,161M = 9.15).

The similar P/S figures hide different businesses. Microsoft's net margin in its fiscal 2025 was 36.1% ($101,832M ÷ $281,724M); Alphabet's in calendar 2025 was 32.8%; Apple's 26.9%. Dividing each P/S by its net margin gives Microsoft about 27, Alphabet about 27 and Apple about 34 — which matches their P/E ratios. In other words, the market pays roughly the same for a dollar of each company's sales, so it is paying more for each dollar of Apple's profit.

One more caveat: the fiscal years end on different dates. Microsoft's year ended June 30, 2025, nine months before the price date, so its revenue figure was older than Alphabet's (December 31, 2025). Comparable-company work always has to decide whether to use the latest fiscal year or trailing twelve months.

How to read a P/S ratio

There is no universal "good" P/S. A few rough rules of thumb help frame it:

• Within an industry, P/S tracks margins. Companies with higher gross and net margins usually command higher sales multiples. Software and payment networks tend to sit near the top; retailers, distributors and refiners near the bottom.
• Growth raises it. If investors expect revenue to double, today's sales understate the business they are buying.
• Look at the history. A company's own P/S over ten years tells you whether today's multiple is high or low for that company, which is often more informative than a cross-industry comparison.
• Pair it with margin trend. A rising P/S with falling margins is a warning sign; a rising P/S with rising margins may simply reflect better economics.

Pitfalls and limitations

It ignores debt. Market cap measures only the shareholders' claim. Two companies with identical sales and market caps are not equally valued if one also owes $50 billion to lenders. The fix is to use enterprise value instead of market cap — see EV/Sales ratio: enterprise value to revenue, explained.

Revenue quality varies. A dollar of recurring subscription revenue is worth more than a dollar of one-time hardware sales or pass-through revenue that a company books gross but keeps little of. Apple's fiscal 2025 revenue mixed $307,003M of products at a 36.8% gross margin with $109,158M of services at 75.4%; a shift in that mix changes what each sales dollar is worth.

Accounting choices matter at the top line too. Whether a company reports revenue gross or net of what it pays partners, and when it recognizes multi-year contracts, can move revenue. The Revenue recognition: the ASC 606 five steps, with Apple’s numbers page covers the US GAAP rules.

It can flatter unprofitable companies. A low P/S on a business that will never earn a profit is not a bargain. P/S invites the question "what margin is coming?"; it does not answer it.

P/S and its neighbours

How Finabase does it

Finabase shows P/S in three places, each with a different data basis:

• The Key statistics card on a stock's summary page, for example Apple's, lists Price / sales alongside market cap and revenue. The value is passed through from the data provider on a trailing-twelve-month basis, so it moves daily with the price and quarterly with revenue.
• The valuation tab charts P/S for ten fiscal years, one bar per year, from FMP's annual data. This is where you see whether today's multiple is high or low against the company's own history. It is annual only; there is no quarterly multiple history.
• The screener can filter on Price/Sales, one of its few fundamental fields alongside market cap, P/E, EPS and dividends. That makes it easy to pull, say, large companies trading under three times sales, and then check their margins on the financials tab.

Finabase does not compute a peer P/S table; the peer figures on this page were calculated from SEC filings.

Frequently asked questions

What is a good price-to-sales ratio?

There isn't one number; a good P/S depends on the margins and growth of the industry. A P/S of 2 might be high for a retailer with 3% net margins and low for a software company with 30% margins. Compare within an industry and against the company's own history.

Why use P/S instead of P/E?

Use P/S when earnings are negative, near zero or distorted by one-time items, because P/E is meaningless in those cases while revenue is still positive and stable. For profitable, mature companies P/E usually carries more information.

Does a low P/S mean a stock is undervalued?

No. A low P/S often reflects thin margins, slow growth or doubts about the business. It is a starting point for questions about margins, not a verdict.

Should P/S use trailing or forward revenue?

Either, as long as you are consistent across the companies you compare. Trailing revenue is reported fact; forward revenue is an estimate. Data providers usually label which one they show.

Summary

The price-to-sales ratio divides market capitalization by annual revenue — for Apple at the end of fiscal 2025, $3.77 trillion over $416.2 billion, or 9.07. It is useful exactly where earnings-based multiples fail, for unprofitable or cyclically depressed companies, and its real meaning comes through the identity P/S ÷ net margin ≈ P/E. Apple, Microsoft and Alphabet traded at similar sales multiples in March 2026, but their different margins mean the market was paying very different prices for their profits. Use P/S within an industry, against a company's own history, and always next to its margins; switch to EV/Sales when debt or cash is large.