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P/E requires earnings. P/FCF requires cash. P/S requires only revenue — which makes it the only valuation tool that works on day one of a company's life.
It is the most widely abused metric in growth investing, and one of the most useful when applied correctly.
The formula#
P/S Ratio = Market Capitalization / Annual RevenueA company worth $50B with $5B in annual revenue trades at 10× P/S.
That tells you investors are paying $10 for every $1 of sales. Whether that is cheap or expensive depends entirely on what percentage of that $1 eventually becomes profit.
| P/S | What it typically signals |
|---|---|
| Below 1× | Thin-margin or commodity business; verify gross margin before calling it cheap |
| 1–3× | Normal range for mature, profitable businesses |
| 3–8× | High-margin model or strong growth trajectory priced in |
| Above 10× | Software or platform premium; sustained margins and revenue growth required |
What the market looks like right now#
Across 4,922 US stocks with reported revenue, the cap-weighted P/S ratio sits at 1.9× today.
Over the last 28 days, it has moved higher from 2.9× to 3.0× — a meaningful shift.
2,518 stocks trade below 2.0× — revenue-heavy, margin-thin, or simply cheap. 358 trade above 15.0× — markets are paying a large premium per dollar of revenue, usually for high-margin models or explosive growth.
Why sector matters more here than any other metric#
Healthcare has the highest average P/S in the market right now at 6.5×.
Consumer Cyclical sits at the other end at 1.8×.
The spread exists because margin structures are completely different across sectors. A software company keeps 70–80 cents of every revenue dollar as gross profit. A grocery chain keeps 25 cents. You should pay more per dollar of software revenue — you are buying a fundamentally different business.
Never compare P/S across sectors. Always compare within.
A live example#
NVIDIA Corporation (NVDA) trades at 22.1× P/S — well above the market median of 1.9×. NVIDIA's gross margin runs above 70%: software-like economics attached to physical hardware at massive scale.
The question for every high P/S stock is the same: what is the gross margin, and does it justify paying a premium per revenue dollar? At 70%+ gross margins the answer for NVDA has been yes. At 30% gross margins with the same multiple, the math does not work.
The cautionary tale: Pets.com, 2000#
Pets.com went public in 2000 at a P/S of over 8×. It sold pet food and supplies — a business structurally incapable of high margins. Revenue was real. The model was not.
The company shut down nine months after its IPO. The money was there; the margin structure to justify the multiple was not.
P/S tells you how much investors believe in a revenue dollar. It does not tell you how much of that dollar survives as profit.
Where P/S breaks#
Low-margin businesses can look cheap and destroy capital. A supermarket chain at 0.3× P/S sounds cheap. If net margins are 2%, the business earns $0.02 per $1 of sales — earning back the market's implied price over decades. "Cheap P/S" in commodity retail is often priced correctly.
High-margin businesses deserve high P/S — but only if margins are real and durable. During the 2021 software boom, many SaaS companies traded at 30–60× P/S. Some had 70% gross margins but were burning cash on sales and marketing. The margin was in the gross line, not the operating line. P/S missed it.
Deferred revenue inflates the picture. Enterprise software companies collect annual subscriptions upfront. Current-period revenue can understates the true business scale. Forward P/S or ARR multiples are more accurate for these.
Acquisitive companies consolidate revenue. A roll-up acquisition strategy can show soaring revenue growth with flat organic performance. Always check organic growth rate separately from reported revenue.
How to use it#
- Use P/S to value companies without earnings — it is the primary tool for early-stage growth
- Always pair with gross margin — a 10× P/S on 70% gross margins is different from 10× on 30%
- Compare P/S to the sector median, not the market median
- Use forward P/S for software and subscription businesses where deferred revenue is large
- The Growth Stocks screen combines P/S with revenue growth rate and gross margin to filter for quality growth at reasonable prices
Bottom line#
P/S is the most democratic valuation metric — it works for nearly every company.
But it is also the most dangerous one in the wrong hands.
A dollar of revenue is only worth paying for if it eventually becomes a dollar of profit. Ask that question first.