Price-to-Sales (P/S) Ratio
Stock price divided by revenue per share. Useful for companies without profits yet.
Why it matters
A share price by itself says nothing, and even profit can mislead. Profit swings with one bad year, a heavy round of investment, or a single write-off, and a young company may have no profit at all. When earnings wobble or vanish, the P/E ratio swings wildly or cannot be calculated. The P/S ratio steps in by measuring price against sales: how much you pay for each ₹1 of yearly revenue.
Revenue is the top line of the income statement, and it is far steadier than the profit below it. That stability is the point. P/S gives you a valuation handle even when earnings do not cooperate, which makes it the first number investors reach for with fast-growing or not-yet-profitable companies, and a useful sanity check for profitable ones too.
An everyday way to picture it
Picture buying a busy juice stall, priced not on what it keeps but on what it rings up. The stall takes in ₹4 lakh of sales a year, and the owner wants ₹10 lakh for it. You are paying 2.5 times its yearly sales, and that multiple is the P/S.
Notice what the number leaves out. It says nothing yet about rent, fruit, and wages, so it cannot tell you what the stall actually keeps. Two stalls with the same ₹4 lakh in sales can pocket very different profits. P/S measures the price of sales, never the quality of them, and that single blind spot is the key to using it well.
What the number is really telling you
A P/S is never simply "high equals bad" or "low equals good". It is a statement about what the market expects from a company's sales, and reading it means asking what those expectations are.
| What you see | What it usually means | The honest catch |
|---|---|---|
| A high P/S | The market is paying a lot for each rupee of sales, usually betting on fast growth or fat margins. | If that growth or those margins do not show up, the price has a long way to fall. |
| A low P/S | The market expects little growth, or doubts the company can turn its sales into profit. | It can be a real bargain, or a thin-margin business that deserves to be cheap. |
A company with no profit has an EPS of zero or below, so its P/E cannot be computed and shows as 'N/A'. Sales, though, are almost always positive. That is why P/S is the default gauge for three kinds of company: young firms growing fast but not yet profitable, cyclical businesses caught in a bad year, and firms ploughing every rupee back into growth. In each case sales tell a steadier story than profit.
The catch: P/S ignores profit
Here is the trap. P/S looks only at sales, so it is blind to what a company keeps from them. Two firms can carry the same P/S while earning wildly different profit, and the one with thinner margins is the worse deal even though it looks identical on sales.
That formula shows why margins matter. Take two snack makers, each at a P/S of 2.5. Sunrise keeps 10 paise of profit on every rupee of sales, so its P/E works out to 25. A thin-margin rival keeps just 3 paise, so the same P/S of 2.5 hides a P/E above 80, more than three times as expensive on profit.
| Two snack makers | Net margin | P/S | Resulting P/E |
|---|---|---|---|
| Sunrise Foods | 10% | 2.5 | 25 |
| Thin-margin rival | 3% | 2.5 | 83 |
This is also why you can only compare P/S within an industry. A software firm keeps most of every sale and routinely trades above a P/S of 10, while a supermarket runs on wafer-thin margins and a P/S near 1 can still be rich. Judge a company against its own history and its direct rivals, never against a business built on different economics.
See it for yourself
Adjust Sunrise's price and revenue per share, and watch both the P/S ratio and where it sits on the cheap-to-expensive scale.
Worked example: Sunrise Foods
Sunrise Foods makes packaged snacks and staples sold across India. It is a steady, profitable consumer brand, the kind of business a beginner can reason about without specialist knowledge.
Let us build its P/S from the ground up, using the same revenue and share count we reuse throughout these lessons. We will check it two ways, per share and at the company level, and they must agree.
| Step | Working | Result |
|---|---|---|
| Revenue last year | The top line of the income statement | ₹2,000 crore |
| Shares outstanding | Total shares the company has issued | 10 crore |
| Revenue per share | ₹2,000 crore ÷ 10 crore shares | ₹200 per share |
| Share price today | What the market is charging | ₹500 |
| P/S (per share) | ₹500 ÷ ₹200 | 2.5 |
| Cross-check (company level) | ₹5,000 crore market cap ÷ ₹2,000 crore sales | 2.5 |
So you pay ₹2.5 for every ₹1 of Sunrise's yearly sales, which makes it fairly priced on sales. The number it hides is the margin: Sunrise keeps about 10 paise of profit on each rupee of sales, a healthy level, so that P/S of 2.5 translates into a P/E of about 25. On sales it looks reasonable, and the solid margin backs that up.
Your call
Suppose a rival in the same aisle, Lowfield Foods, has roughly the same sales as Sunrise but trades at a P/S of just 1.5, well below Sunrise's 2.5. On sales alone it looks cheaper. Would you buy Lowfield instead, or stay with Sunrise?
Remember this
| P/S range | What it usually signals | How to read it |
|---|---|---|
| Below 1 | Cheap relative to sales | Could be a bargain, or a low-margin business the market has written off. Check margins. |
| 1 to 3 | A common, reasonable range | Typical for steady, profitable companies. Compare with direct peers. |
| 3 to 5 | Strong growth is priced in | Justified only if sales are growing fast and margins are healthy. |
| Above 5 | High expectations are baked in | Common for fast growers. Little room for a stumble. |
In short: P/S is the price of a company's sales, not the quality of them. It shines when profit is thin or absent, but always pair it with margins and growth before you call a stock cheap.