Price to Sales (P/S): Spot growth before everyone else

Find out if you're overpaying for a company's revenue.

Explainer

A stock's Price to Sales (P/S) tells you how much you're paying for each dollar of the company's revenue.

Generally speaking, a lower P/S ratio is better, but rapid revenue growth can make a high P/S ratio justified.

How to read P/S numbers

P/S numbers typically fall into five ranges:

• P/S below 1.0: Potentially undervalued (buy opportunity)
• P/S 1.0-3.0: Fair value range
• P/S 3.0-6.0: Reasonable value range
• P/S 6.0-15.0: Expensive
• P/S above 15.0: Very expensive

Formula

A P/S ratio is calculated by dividing a company's market capitalization by its total annual revenue.

Example

This example shows two companies where one trades at a lower P/S ratio (better value) while the other trades at a higher P/S ratio (more expensive relative to sales).

Here's the key insight: Company B's P/S of 2.0 represents better value compared to Company A's P/S of 5.0. With Company B, you're paying less than half as much for each dollar of revenue.

In our example, Company B (P/S 2.0) offers better value, while Company A (P/S 5.0) appears expensive relative to its sales.

Why P/S provides clearer insight

P/S provides value because it focuses on top-line revenue rather than bottom-line earnings, which can be affected by various accounting choices.

• Earnings can be shifted between quarters
• Sales figures typically reflect actual business activity
• P/S shows the real growth story without accounting tricks.

When does P/S work best?

P/S is most effective for:

• Unprofitable companies with strong revenue growth
• Comparing companies within the same industry or sector
• Early-stage companies that reinvest all profits back into growth
• Cyclical businesses where earnings fluctuate but sales remain stable

Limitations

The P/S ratio is not a perfect solution. Important limitations to consider:

• P/S ignores profitability: high sales mean nothing without decent margins.
• P/S ratios vary dramatically by industry (tech companies often trade at 8+ while retailers typically stay under 1)
• It doesn't account for debt levels or financial health
• One-time revenue spikes can create misleading low P/S ratios
• For asset-heavy businesses (banks, insurers, industrials), P/S vs P/B covers when book value is the better lens

The bottom line

P/S ratio answers a critical question: "What am I paying for each dollar of revenue this company generates?"

Before dismissing a stock because it has no P/E ratio or seems "expensive," always check its P/S. You might discover that the unprofitable company with massive sales growth is actually a better value than the profitable company with stagnant revenue. Use P/S alongside other stock fundamentals for the most accurate assessment.

This approach helps you spot tomorrow's winners while they're still building revenue today.

Frequently Asked Questions

Who popularized the price-to-sales ratio? Kenneth Fisher brought the P/S ratio into mainstream investing through his 1984 book "Super Stocks," where he argued that revenue was harder to manipulate than earnings and therefore gave a more honest read on value. Before Fisher's work, most investors leaned almost entirely on P/E. His approach was especially useful for cyclical and turnaround situations, where earnings could temporarily disappear while the underlying business stayed intact.

What is the difference between P/S and EV/Sales? P/S divides market cap by revenue and ignores how the business is financed. EV/Sales uses enterprise value instead, which adds total debt and subtracts cash before dividing by revenue. For a company with little debt the two numbers are almost identical, but for a heavily indebted business EV/Sales is usually the fairer measure because it captures the full cost of acquiring the company.

Can a P/S ratio be negative or zero? It cannot be negative because revenue is almost never negative, which is one reason P/S keeps working in situations where P/E breaks down. A P/S near zero would only appear for a shell company with essentially no sales, and in that case the ratio tells you nothing useful. This resilience is exactly why investors reach for P/S when analyzing loss-making growth companies.

Should I use P/S or P/B to value a company? It depends on what the business actually owns. P/S fits asset-light companies where growth comes from revenue rather than physical assets, like software, media, and consumer brands. P/B fits asset-heavy businesses like banks, insurers, and industrial groups where the balance sheet drives the value.