Knowledge BaseValuation & multiples › Price-to-Earnings (P/E) Ratio
Valuation & multiples

Price-to-Earnings (P/E) Ratio P/E

How many dollars investors pay for each dollar of a company's annual earnings.

Part of the Valuation 101 course · Lesson 3 of 14
Formula
Share Price / Earnings Per Share (EPS)
Share pricewhat you pay÷EPSwhat it earns=P/Eyears to earn it back
P/E is simply what you pay for each $1 a company earns.

What it is

The P/E ratio compares a stock's share price to its earnings per share (EPS). It tells you how richly the market values a company's profits. A higher P/E means investors are paying more per dollar of current earnings, often because they expect future growth.

Why it matters

P/E is the most common quick gauge of how cheap or expensive a stock looks relative to its profits and its peers. Pitfalls: it is meaningless or negative when a company loses money, it can be distorted by one-time gains or charges, and a low P/E can signal a value trap rather than a bargain.

How it's calculated

Divide the current share price by the trailing twelve months of diluted earnings per share. It can also be computed as total market capitalization divided by total net income.

How Quintarthai uses it

P/E appears in the Summary Key-metrics grid and in the Ratios tab (multiples) on every stock's company page, and is a filterable field in the Stock Screener.

Cross-border note. EPS for a Canadian issuer is reported under IFRS via SEDAR+, while US issuers report under US GAAP via SEC EDGAR, so cross-border P/E comparisons can differ on accounting treatment even before currency.

FAQ

What is a good P/E ratio?
There is no single good number; a fair P/E depends on the company's growth, stability, and sector, so it is most useful compared against peers and the company's own history rather than in isolation.
Why is a P/E ratio sometimes blank or negative?
When a company has zero or negative earnings the ratio is undefined or not meaningful, so it is usually shown as 'n/m' rather than a misleading number.
Related terms
See Price-to-Earnings (P/E) Ratio on a real company
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