What Is a Good P/E Ratio?

There is no single good P/E ratio. As a rough anchor, the S&P 500 has historically averaged somewhere around 15–20x, so a P/E in that range is unremarkable. But a "good" P/E depends entirely on the company's growth rate, its sector, and where interest rates sit — and a low P/E is often a warning rather than a bargain.

If you want the mechanics of the ratio itself, start with what a P/E ratio is. This page is about how to judge one.## Why there is no universal answer

P/E is price divided by earnings per share. It tells you what the market is paying for each dollar of current profit. That number embeds an expectation about the future, which is why identical P/Es can mean opposite things.

A utility trading at 18x and a software company trading at 18x are not equivalently valued. The utility's earnings are stable and slow-growing; the software company's may double or collapse. The market is making very different bets at the same price.

Three things move what counts as reasonable:

Growth rate. A company growing earnings 30% a year justifies a higher multiple than one growing 3%. This is the whole idea behind the PEG ratio, which divides P/E by the growth rate to make the comparison fairer.

Interest rates. When safe bonds yield 5%, investors demand more from equities, and multiples compress. When rates are near zero, the same earnings support a much higher price. A P/E that looked expensive in 2007 and cheap in 2021 may not reflect any change in the business.

Sector economics. Capital-intensive, cyclical, and regulated industries structurally trade lower. Asset-light businesses with recurring revenue trade higher. That is a permanent structural feature, not a mispricing.

Rough sector ranges

Treat these as orientation, not thresholds. They shift with the rate environment.

Sector	Typical range	Why
Utilities	15–20x	Stable, regulated, slow growth
Consumer staples	18–25x	Predictable demand, modest growth
Financials	8–15x	Cyclical, leverage-sensitive
Energy	5–15x	Commodity-driven, highly cyclical
Industrials	15–25x	Tracks the economic cycle
Healthcare	15–30x	Wide range: pharma vs biotech differ enormously
Technology	20–40x+	High growth, asset-light, scalable

Compare a company to its own sector and its own history, not to a single market-wide number. A bank at 25x and a software company at 25x are telling you very different things.

When a low P/E is a trap

The most expensive mistake in this area is treating a low P/E as automatically cheap. Markets price businesses low for reasons, and the reasons are usually visible:

The value trap. A structurally declining business — print media, mall retail, some legacy hardware — can trade at 8x for years while earnings shrink underneath. The multiple never re-rates because the E keeps falling. Cheap on today's earnings, expensive on tomorrow's.

Peak cyclical earnings. Cyclical companies look cheapest at the top of their cycle, when earnings are at maximum. A miner at 6x after a commodity spike is often more dangerous than the same miner at 20x after a trough. For cyclicals, a low P/E can be a sell signal.

One-off profits. An asset sale or legal win inflates E for one year, mechanically deflating P/E. The business has not changed.

Real distress. Sometimes low is correct: debt problems, a lost patent, litigation, or a broken competitive position.

The reverse also holds. A high P/E is not automatically expensive — if a company genuinely compounds earnings at 30%, a 40x multiple can be reasonable. The risk is that it doesn't, and high-multiple stocks fall hard when growth disappoints.

How to use it properly

P/E is a starting question, not a conclusion. A workable sequence:

1. Compare to the company's own history. Is it above or below its 5-year average, and has anything changed to justify that?
2. Compare to close competitors, not the whole market.
3. Adjust for growth with the PEG ratio.
4. Check the E is real — look at free cash flow and whether earnings are inflated by one-offs.
5. Check the balance sheet. Two identical P/Es are not equivalent if one carries far more debt.

See P/E on real companies

Key Statistics on each stock page shows both trailing and forward P/E:

• NVDA · AAPL · MSFT · GOOGL · AMZN · META · TSLA

Compare the tech names against each other rather than against the market average — the gap between forward and trailing P/E tells you what growth the market is expecting.

Sources

• U.S. SEC (investor.gov) —
• FINRA — Stocks