The price-to-sales ratio formula
The price-to-sales ratio is share price divided by sales per share: price-to-sales ratio = share price ÷ sales per share. The share price is what one share costs on the market today. Sales per share is the company’s sales for the year, divided by the number of shares. The answer is a multiple, not a dollar amount: 12.50 means twelve dollars and fifty cents of price for each dollar of annual sales. Try the numbers on the price-to-sales ratio calculator and it does the division for you.
Step 1: find the share price
Start with the market. The share price is the price one share trades at today — the number on the quote page, the brokerage app, the market data site. Here is the worked example: a share price of $150.00. Use the price on the day you are judging the stock.
Step 2: find the sales per share
Start with the company’s accounts. Sales per share is the company’s sales for the year, divided by the number of shares in issue — the revenue line on the income statement, per share. Here is the worked example: sales per share of $12.00. Use the same year for both numbers, and use trailing-twelve-month sales when you compare across years, because one quarter alone can mislead for seasonal businesses.
Step 3: divide and read the answer
Divide the share price by the sales per share. Here is the worked example: $150.00 ÷ $12.00 = 12.50. The arithmetic is $150.00 ÷ $12.00 = 12.50, so each $1 of annual sales costs $12.50 of price. The answer is a multiple, not a dollar amount — write it as 12.50, not $12.50.
Three worked examples
Example one — the headline numbers. A stock costs $150.00 a share and sells $12.00 a share. The price-to-sales ratio is $150.00 ÷ $12.00 = 12.50. Each $1 of annual sales costs $12.50 of price.
Example two — trailing twelve months. A seasonal business sells $2.80 a share in the first quarter, $3.10 in the second, $2.90 in the third and $3.20 in the fourth — $12.00 for the year. Its share price is $150.00. The ratio is $150.00 ÷ $12.00 = 12.50. One quarter alone would have misled you.
Example three — how much must it sell? A stock costs $150.00 a share and you want a 10.00 P/S. The sales per share needed is $150.00 ÷ 10.00 = $15.00 — the sales the company must reach for the multiple to fall to the target on the price it already has. The price-to-sales ratio calculator runs the reverses for you.
One reverse to check your answer
Work the numbers backwards to check them. A stock sells $12.00 a share and you want its P/S to reach 10.00. The smallest whole-cent share price for the P/S to reach the target is $120.00 — $120.00 ÷ $12.00 is exactly the target. A cent less, and the price is $0.01 short of the $120.00 needed. The price-to-sales ratio calculator runs the reverses for you.
Share price vs sales per share
The share price is what the market charges today — it moves every second the market is open, and it is the same for every buyer. Sales per share is what the company sold — it moves four times a year, when the accounts come out, and it is the same for every share. The ratio joins them: the price the market charges against the sales the company made. When the price rises and sales stay put, the ratio rises; when sales rise and the price stays put, it falls.
What a high P/S means
A high P/S means the market pays a lot for each dollar of sales — it expects the sales to grow fast. Above two is expensive by the rough yardstick — but the bar moves by sector: fast-growing software stocks often run above five because investors pay for future sales, while grocers and retailers often run below one because their margins are thin, so compare within one industry, not across them. A 12.50 P/S is the price of a fast grower, not a bargain.
What a low P/S means
A low P/S means the market pays little for each dollar of sales — it expects the sales to stay flat, or it doubts them. Below one is cheap by the rough yardstick — but a cheap multiple can mean a bargain, or a business in trouble. The S&P 500’s long-run average P/S is roughly one and a half to two, so a P/S near two is the middle of the market.
Trailing vs forward P/S
The trailing P/S uses the last twelve months of sales — what the company actually sold. The forward P/S uses forecast sales — what analysts expect it to sell — and it is usually lower, because sales are expected to grow. Use the trailing P/S when you want facts, and the forward P/S when you want the market’s guess. Never mix them: a trailing 12.50 against a forward 10.00 is two different measures.
The P/S vs the P/E
The price-to-earnings ratio is the share price divided by earnings per share — price per dollar of earnings — while the P/S is the share price divided by sales per share — price per dollar of sales. They are two sides of the same coin: the P/S works where the P/E fails, because a company losing money has no P/E at all, but it still has sales. Check both before you judge. Read the guide to the price-to-earnings ratio and try the price-to-earnings ratio calculator and the cash flow margin calculator for the profit side.
What to do when the P/S is high
Two levers bring the multiple down. More sales: the company grows its revenue, and the same price buys a lower multiple. A lower price: the market falls, and the same sales cost less. The P/S does not account for profitability — a company can look cheap on P/S while losing money on every sale — so cross-check with the cash flow margin and the price-to-earnings ratio before you buy.
Why compare within one industry
The bar moves by sector. Fast-growing software stocks often run above five because investors pay for future sales, while grocers and retailers often run below one because their margins are thin. Compare a stock with its own sector, its own history, and the market average — roughly one and a half to two for the S&P 500 — and judge the growth, not the multiple alone.