science

Price–sales ratio

Price–sales ratio is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Price–sales ratio rather than just read about it. In short: The price-to-sales ratio (P/S ratio or PSR) is a financial ratio used to assess a company's market value relative to its revenue. It is calculated by dividing the company's market capitalization by its total revenue over a specified period, typically the trailing twelve months (TTM), or equivalently, by dividing the unit price of each share by the per-share revenue.

Key takeaways

Price–sales ratio belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Price–sales ratio to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Price–sales ratio from memory before moving on to harder problems.

Reference excerpt

The price-to-sales ratio (P/S ratio or PSR) is a financial ratio used to assess a company's market value relative to its revenue. It is calculated by dividing the company's market capitalization by its total revenue over a specified period, typically the trailing twelve months (TTM), or equivalently, by dividing the unit price of each share by the per-share revenue. Investors use this metric to gauge how much they are paying for each dollar of a company's sales, often as an alternative to the price-to-earnings ratio (P/E ratio) when earnings are negative or volatile. The P/S ratio is particularly useful for valuing unprofitable companies, as it relies on revenue rather than profit, which may be absent or distorted by accounting practices. A lower ratio (e.g., below 1.0) may suggest a stock is undervalued, while a higher ratio could indicate overvaluation, though interpretation depends on industry norms and company context. The ratio can also track a stock's valuation over time or compare companies within the same sector.

Calculation The price-to-sales ratio is expressed as:

P/S Ratio = Market Capitalization Revenue = Stock Price per Share Revenue per Share {\displaystyle {\text{P/S Ratio}}={\frac {\text{Market Capitalization}}{\text{Revenue}}}={\frac {\text{Stock Price per Share}}{\text{Revenue per Share}}}}

Market capitalization: The total value of a company's outstanding shares, calculated as stock price multiplied by the number of shares. Revenue: Total sales or income over a period, typically the trailing twelve months (TTM) unless otherwise specified. A justified P/S ratio adjusts this metric based on fundamentals, derived from the Gordon Growth Model. It incorporates the profit margin, dividend payout ratio, sustainable growth rate (g), and required rate of return (r):

Justified P/S = Profit Margin × Payout Ratio × 1 + g r − g {\displaystyle {\text{Justified P/S}}={\text{Profit Margin}}\times {\text{Payout Ratio}}\times {\frac {1+g}{r-g}}}

Here, the growth rate g is calculated as:

g = Retention Ratio × Return on Equity {\displaystyle g={\text{Retention Ratio}}\times {\text{Return on Equity}}}

where the retention ratio is 1 minus the payout ratio, and return on equity (ROE) reflects profitability relative to shareholders' equity.

Interpretation A low P/S ratio may indicate a potential bargain, but it does not account for profitability or expenses, limiting its standalone usefulness. It is most effective for unprofitable firms lacking a P/E ratio or for comparing similar companies within a sector, where revenue patterns are more consistent. However, P/S ratios vary widely across industries due to differences in typical capital structures (e.g., technology vs. utilities), making cross-sector comparisons less reliable.

See also Financial ratio Price-to-earnings ratio Price-to-cash-flow ratio

References

Worked examples

Example 1 — a first encounter with Price–sales ratio

Start with the simplest possible case. Write down what Price–sales ratio claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Price–sales ratio before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Price–sales ratio ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Price–sales ratio

In research: Price–sales ratio appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Price–sales ratio in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Price–sales ratio is common in secondary-school and first-year university syllabi. It links to neighbouring topics Financial ratios, so understanding it makes those chapters shorter.
In everyday life: Look for Price–sales ratio outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Price–sales ratio in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Price–sales ratio means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Price–sales ratio out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Price–sales ratio in simple terms?

Why does Price–sales ratio matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Price–sales ratio?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Price–sales ratio.