What Is the Price-to-Sales Ratio?
The price-to-sales ratio measures how much equity investors are paying for each dollar of a company's revenue. It can be computed at the company level as market capitalization divided by total revenue, or on a per-share basis as stock price divided by sales per share, with both approaches producing the same answer.
Because revenue exists even when earnings do not, P/S became a favorite tool for valuing young or temporarily unprofitable companies. Investor Ken Fisher popularized the ratio in his 1984 book Super Stocks, arguing that sales are more stable than earnings and less vulnerable to accounting judgment, making P/S useful for spotting companies whose profits are depressed but recoverable.
How to Calculate It
The formula is P/S = market capitalization divided by trailing-twelve-month revenue. A company with a $8.0 billion market cap and $2.0 billion of revenue trades at 4.0x sales. As with any multiple, the raw figure only becomes meaningful next to peers and history: grocery chains and distributors often trade below 0.5x sales because margins are thin, while high-margin software companies can sustain multiples above 10x.
Margins drive nearly everything in interpreting P/S. A dollar of revenue at a 30% net margin is worth many times more than a dollar at a 2% margin, so comparing P/S ratios across industries with different margin structures is close to meaningless. Analysts therefore restrict P/S comparisons to close peers and pair the ratio with gross margin and growth data.
P/S vs. EV/Revenue and Why It Matters
The ratio has a structural flaw that interviewers love to probe: the numerator reflects only the equity claim, but revenue is generated for all capital providers, including lenders. Two companies with identical sales and identical enterprise values will show different P/S ratios if one carries more debt, even though their businesses are worth the same. EV/Revenue fixes this mismatch, which is why bankers quote it instead in comps and pitch materials.
P/S still earns its keep in retail investing and quantitative screens, where market cap data is instantly available and the ratio serves as a quick affordability check on unprofitable growth stocks. For anyone recruiting into IB or equity research, the practical takeaway is to know how to compute P/S, articulate its leverage distortion, and explain when EV/Revenue is the more defensible choice.
