Price-to-Sales (P/S) Ratio

The price-to-sales (P/S) ratio values a company against its top line: market capitalization divided by trailing twelve-month revenue (equivalently, share price ÷ sales per share). It answers how many dollars investors pay for each dollar of sales.

P/S earns its keep where P/E fails — on unprofitable or early-stage companies. Revenue is far harder to manipulate than earnings and stays positive through the loss-making growth phase, so P/S is the default multiple for high-growth software and pre-profit names. It's also more stable through cyclical earnings swings.

The catch: P/S ignores profitability entirely. A dollar of revenue from a 90%-gross-margin software firm is worth vastly more than a dollar from a thin-margin retailer, so P/S is only comparable within a margin cohort. Sophisticated users pair it with margins — or use EV/Sales, which adds debt for a cleaner, capital-structure-neutral read.