What is the Price-to-Earnings (P/E) Ratio?
The price-to-earnings ratio — often called the P/E ratio — is one of the most widely used financial metrics for evaluating stocks. It measures a company's current share price relative to its earnings per share (EPS), giving investors a quick way to assess whether a stock is overvalued or undervalued relative to its earnings.
Simply put, the P/E ratio shows how much investors are willing to pay for each dollar (or ruble, euro, etc.) of a company's earnings. A higher P/E indicates that the market expects strong future growth; a lower P/E may suggest the stock is cheap — or that growth is expected to be slow.
P/E Ratio Formula
To calculate the P/E ratio, you need two values:
- Share Price — the current market price of one share of the company's stock.
- Earnings Per Share (EPS) — the company's net profit divided by the number of outstanding shares, typically measured over the trailing 12 months (TTM).
The formula is:
P/E Ratio = Share Price / Earnings Per Share
This calculator supports all major world currencies including USD, RUB (Russian Ruble), EUR, GBP, JPY, CNY, and many more. Since the P/E ratio is a dimensionless multiple, the result is the same regardless of which currency you use — as long as both inputs are in the same currency.
How to Calculate the P/E Ratio — Example
Let's say a company's stock is trading at $25 per share, and its EPS over the last 12 months is $1.80. Using the formula:
P/E Ratio = $25 / $1.80 ≈ 13.9x
This means investors are paying approximately 14 times the company's annual earnings per share. You can simply enter these values into the P/E ratio calculator above and get the result instantly.
Interpreting the P/E Ratio
The P/E ratio is most useful when compared to other companies in the same industry or to the historical average P/E of the market. Here are general benchmarks:
- P/E < 10x — Low P/E. The stock may be undervalued, or investors expect slow or declining growth. This is common in mature or distressed industries.
- P/E 10–20x — Average/Normal P/E. Typical for stable, profitable companies. Most mature large-cap stocks fall in this range.
- P/E 20–30x — High P/E. Investors expect above-average growth. The market is pricing in future earnings expansion.
- P/E > 30x — Very High P/E. Common for high-growth technology or innovation companies. Carries higher valuation risk if growth disappoints.
Important: A company with negative EPS (a net loss) does not have a P/E ratio — the calculator will notify you in this case.
Frequently Asked Questions (FAQ)
Is a high P/E ratio always bad?
Not necessarily. A high P/E can indicate that investors expect strong future growth. For example, many technology companies trade at high P/E multiples because their earnings are expected to grow rapidly. However, if growth does not materialize, a high P/E stock can fall sharply in price.
Is a low P/E ratio always a good investment?
Not always. A low P/E may indicate an undervalued stock, but it can also signal that the market expects declining earnings, industry headwinds, or specific business risks. Always research the underlying business before drawing conclusions from the P/E alone.
What is a "trailing" vs "forward" P/E?
The trailing P/E uses actual EPS from the past 12 months (TTM — trailing twelve months), which is what this calculator uses. The forward P/E uses analysts' estimated EPS for the next 12 months. Both are useful; the trailing P/E is based on real data, while the forward P/E reflects market expectations.
Does the P/E ratio work the same for all currencies?
Yes. Since both the share price and EPS are expressed in the same currency, the ratio cancels out the currency unit. A stock priced at ₽2,500 with EPS of ₽180 gives the same P/E ratio as a stock at $25 with EPS of $1.80. The P/E ratio is currency-independent — it is a pure multiple.
Which industries typically have high P/E ratios?
Technology, biotechnology, and fast-growing consumer brands typically have higher P/E ratios. Traditional industries like banking, utilities, and basic materials often trade at lower multiples due to slower but stable earnings growth.