The P/S ratio compares a company's stock price to its revenue per share. It's useful for valuing companies that aren't yet profitable (like many tech startups).
A company with $1B revenue and $5B market cap has P/S = 5.0. Investors pay $5 for every $1 of sales.
P/S below 1.0 may indicate undervaluation. P/S above 10 suggests very high growth expectations. Best used for companies in the same industry — comparing a software company's P/S to a retailer's is meaningless. Unprofitable tech companies are often valued on P/S rather than PE, since they have earnings near zero.
Industry context is everything with P/S. A P/S of 5 might be cheap for a SaaS company but absurdly expensive for a grocery chain:
| Sector | Average P/S | Why So High/Low | Example Company |
|---|---|---|---|
| Semiconductors | 13.4x | AI boom, high margins | Nvidia ~18.9x forward |
| Software / SaaS | 11.2x | Recurring revenue, scalability | Salesforce ~6.5x |
| Tech Hardware | 4.5x | Lower margins than software | Dell ~1.2x |
| Broadline Retail | 2.6x | Thin margins (4-5%) | Amazon ~3.5x |
| General Retail | 1.9x | Low margins, mature industry | Walmart ~1.0x |
| S&P 500 Overall | 3.5x | Blend of all sectors | — |
A P/S of 18.9x means investors pay $18.90 for every $1 of Nvidia's revenue. That sounds absurd until you consider: Nvidia's gross margin is ~75% (vs. Walmart's ~25%), revenue grew 125%+ YoY in 2024, and net profit margins exceed 55%. A company converting $1 of revenue into $0.55 of profit deserves a much higher P/S than one converting $1 into $0.03. This is why P/S must be paired with margin analysis.
💡 Pro Tip: P/S × Profit Margin = P/E Proxy
Here's a quick mental math trick: if a company has a P/S of 5x and a 20% net margin, its implied P/E is roughly 5 ÷ 0.20 = 25x. This works because P/E = (Price/Sales) ÷ (Earnings/Sales). Use this to quickly compare unprofitable growth stocks to profitable peers — just apply the target margin they're expected to reach at maturity.
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Generally, P/S below 1.0 is considered cheap, 1-3 is reasonable for most industries, and above 5 suggests high growth expectations. However, like all ratios, it must be compared within the same industry. Software companies regularly trade at 10x+ sales, while retailers at 0.5x may be expensive.
Why use P/S instead of PE?
P/S is useful when companies are unprofitable (no earnings = no PE ratio). Startups and growth companies often have negative earnings for years, making PE meaningless. Revenue is also harder to manipulate than earnings through accounting choices. However, P/S ignores profitability — a company could have huge revenue and no profit.
Does a low P/S mean a stock is cheap?
Not necessarily. A low P/S might mean the market doubts the company can convert revenue into profit. Retailers often have low P/S ratios (0.3-0.8) because their margins are thin, while software companies have high P/S (5-20) because margins are fat. Always pair P/S with profit margin analysis.