Price-to-Sales Ratio: Valuing a Loss-Making Company

A new coffee shop opens at the corner of your street. Three months in, you ask the owner how it's doing. He doesn't talk about profit — there isn't any yet, he's still paying off the espresso machine. He talks about footfall: "Two hundred cups a day now, up from sixty when we opened." You instinctively understand what he means. The shop isn't making money, but it's clearly busy, and a busy shop that hasn't figured out its costs is a very different thing from an empty one.

That instinct — judging a young business by how much it's selling, before it earns a rupee of profit — is exactly what the price-to-sales ratio does. And like the coffee-shop owner's footfall number, it's genuinely useful and quietly dangerous in the same breath.

What the price-to-sales ratio actually is

Price-to-sales, or P/S, is one number divided by another: the company's total market value (its market capitalisation — the share price times every share that exists) divided by its yearly sales (also called revenue — the total money customers paid it, before any costs are taken out).

$\text{P/S} = \frac{\text{market capitalisation}}{\text{annual sales}}$

A P/S of 3 means the market is paying ₹3 for every ₹1 of sales the company makes in a year. That's the whole idea. It tells you how dear the business is relative to its size, measured at the very top of the income statement — the line that exists even when the bottom line (profit) is zero or negative.

That last part is why P/S exists at all. The ratio everyone learns first, the price-to-earnings ratio (P/E) — market value divided by profit — simply breaks when there's no profit to divide by. You cannot have a P/E of 50 when earnings are a loss; the maths returns nonsense. P/S keeps working right through the years a company is growing fast and earning little, which is precisely when investors most want a way to size it up.

A real Indian example: a giant that barely earns

Take Eternal Ltd — the parent of Zomato and Blinkit, one of the most-watched stocks on the NSE. (This is an example to learn the ratio on, not a view on whether to own it.)

In FY26 (the year to March 2026), Eternal did about ₹54,364 crore of sales — a genuinely enormous number, more than doubled from ₹20,243 crore the year before (Inve data, 2026). By footfall, this is a roaring business. Now look at the bottom line: net profit for the whole year was about ₹366 crore (Inve data, 2026). That's a net margin of less than 1% — out of every ₹100 a customer spent, under 70 paise reached the owners.

Run the two ratios side by side against Eternal's market value of roughly ₹2,38,557 crore (Inve data, 2026):

Look at what just happened. The P/E of 652 is almost unreadable — it screams "insanely expensive" and tells you nothing you can act on, because the profit it divides by is a sliver that could double or halve next quarter on a rounding error. The P/S of 4.4, by contrast, is a sentence you can think about: the market is paying ₹4.40 for every ₹1 of food and groceries Eternal sells in a year. (Screener.in reports the same FY26 figures and a P/E in the high-600s, confirming the gap.)

That is the whole case for P/S in one table: when profit is tiny and jumpy, the earnings ratio is noise; the sales ratio is signal.

The danger hiding inside the same number

Here is where the coffee-shop analogy earns its keep — and turns on you.

Footfall only becomes wealth if the shop eventually turns those cups into profit. Two hundred customers a day is worthless if every cup is sold at a loss; in fact, more footfall then means more loss. A rupee of revenue is only valuable to an owner to the extent it eventually drops to the bottom line as cash. P/S quietly assumes that conversion will happen. It does not prove it.

This is the trap that has burned investors for decades. The cleanest warning came from Scott McNealy, CEO of Sun Microsystems, after the dot-com bubble popped and his stock had fallen roughly tenfold. Asked why anyone had paid ten times sales for it, he said: "At 10 times revenues, to give you a 10-year payback, I have to pay you 100% of revenues for 10 straight years in dividends." (Bloomberg, 31 March 2002). His point: paying a high multiple of sales only works if a fat slice of those sales becomes profit you keep — and that, he argued, was ridiculous.

So a low P/S is not automatically cheap, and a business growing sales fast is not automatically winning. The question the ratio can't answer on its own is the only one that matters: will these sales ever become profit, and how much? A company selling ₹100 at a 20% margin is worth vastly more per rupee of sales than one selling ₹100 at a 2% margin — yet on P/S alone they can look identical.

How to use P/S without getting hurt

P/S is a screwdriver, not a Swiss Army knife. Used for the right job, it's excellent. Three rules keep it honest.

First, always pair it with a margin. P/S tells you what you're paying per rupee of sales; the net margin tells you how much of that rupee the owner keeps. Notice that P/E is just these two multiplied together: a 4.4× P/S on a 0.67% margin is a 652× P/E — same fact, different lens. Never quote one without glancing at the other.

Second, compare like with like. A P/S of 4 is expensive for a supermarket that runs on 3% margins and cheap for a software firm that keeps 25 paise of every rupee. The ratio only means something against the company's own history and its direct peers in the same business model.

Third — and this is the real test for a young, unprofitable company — ask whether management has actually told you where the margin is going. This is the difference between an owner and a hoper. Eternal's quick-commerce arm, Blinkit, is where most of the sales-without-profit sits, and on its Q4 FY26 call management guided to a quick-commerce margin of "3-3.5% in the next three to four years" (Inve data, 2026). That is the bridge from footfall to profit, stated out loud, with a number and a timeline. (We trace which Eternal targets get repeated and which quietly vanish in a separate piece.) Whether you believe it is your judgement to make — but a guided target you can check next year beats a vague "margins will improve someday." The whole job of an owner here is to hold management to that bridge, quarter after quarter, and notice the moment it goes quiet. That portfolio-wide tracking — which commitments are being met and which are quietly slipping — is what Promise Tracker is built to do, because nobody can hold ten companies to their guidance by memory.

A P/S ratio, then, is the coffee shop's footfall counter. It tells you the place is busy, and that's worth knowing — especially before the profit shows up. But footfall is a promise of money, not money itself. The owner's job is to never confuse the two.

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