TL;DR: There is no single “good” P/E ratio. A 30x P/E is unremarkable for a tech company but alarming for a utility. To know whether a P/E ratio is high, low, or just right, you have to compare it against the right benchmark: other companies in the same sector.
Table of Contents
- Why sector matters more than the number
- Average P/E ratios by sector
- Why some sectors earn higher multiples
- How to compare P/E ratios correctly
- What this means for your investing
Why sector matters more than the number
If you’ve read our P/E ratio explainer, you know the basic idea: a P/E of 30 means investors are paying $30 for every $1 of a company’s annual earnings. But is 30 expensive or cheap?
It depends entirely on what industry you’re looking at.
A P/E of 30 for a fast-growing software company is completely normal. Investors expect those earnings to grow significantly over the next decade, so they’re willing to pay a premium today. A P/E of 30 for an electric utility (a slow, regulated business with predictable but modest earnings growth) would be a genuine red flag. You’d be paying growth-stock prices for a company that doesn’t grow like a growth stock.
This is the most important thing most beginners miss when using P/E ratios: the number means nothing without context. Context starts with the sector.
Average P/E ratios by sector
The table below shows typical trailing P/E ranges for each major stock market sector, based on long-run historical averages. Individual companies and specific market conditions will push numbers higher or lower, but these ranges give you a baseline for what’s normal.
| Sector | Typical P/E Range | What drives it |
|---|---|---|
| Technology | 25–40x | High growth expectations, scalable business models |
| Communication Services | 18–30x | Mix of growth (streaming, digital ads) and legacy telecom |
| Consumer Discretionary | 20–30x | Cyclical, but includes high-growth names (e-commerce, luxury) |
| Healthcare | 18–28x | Pipeline growth, pricing power, defensive demand |
| Industrials | 18–25x | Steady but cyclical; tied to economic activity |
| Consumer Staples | 18–23x | Stable and defensive; modest but reliable growth |
| Real Estate (REITs) | 30–50x | Distorted by depreciation; use P/FFO instead |
| Utilities | 14–20x | Regulated, slow-growth; valued for yield, not growth |
| Energy | 10–18x | Highly cyclical; earnings swing with commodity prices |
| Financials | 10–16x | Sensitive to interest rates; capital-intensive |
| Materials | 12–20x | Commodity-driven, cyclical |
S&P 500 historical average: roughly 15–20x (though it has traded well above that range in recent years — around 27–28x as of early 2026, per Multpl).
REITs are a special case. Because they depreciate real estate assets heavily on paper, their reported earnings look unusually low, which inflates the standard P/E ratio. Most analysts use price-to-funds-from-operations (P/FFO) as the better comparison metric for REITs.
Why some sectors earn higher multiples
It’s not random that tech stocks trade at higher P/E ratios than banks. Three factors explain most of the gap.
1. Growth rate expectations
Markets price stocks based on future earnings, not past ones. A software company that’s growing revenue at 25% a year can plausibly double its earnings in three years. Investors pay a premium for that trajectory. A utility growing earnings at 3% a year doesn’t earn the same premium, because there’s not much trajectory to bet on.
2. Capital intensity and margins
High-quality software businesses have low capital requirements. Once the product is built, selling another license costs almost nothing. That structure allows for very high profit margins and returns on capital, which the market values richly. Contrast that with energy or utilities, where companies must constantly reinvest billions in physical infrastructure just to maintain their current earnings.
3. Cyclicality and predictability
Earnings in energy, materials, and financials swing dramatically with economic conditions. A bank that earned $5/share last year might earn $2/share in a recession. Because of that uncertainty, investors demand a discount, which shows up as a lower P/E. Sectors with stable, defensive earnings, like consumer staples or healthcare, earn a slight premium over financials and energy, because the earnings are more predictable.
How to compare P/E ratios correctly
Once you know the sector averages, the comparison becomes useful. Here’s the right way to do it:
Compare within the sector first. If you’re evaluating two retail companies, compare their P/E ratios to each other and to the sector average. One trading at 18x and one at 28x tells you something. But comparing a retailer’s 18x to a software company’s 35x tells you almost nothing.
Ask what’s different, not just which is lower. If one company in a sector trades at a meaningful discount to its peers, that’s worth investigating. It might mean the market sees a specific risk (management issues, eroding market share, a looming lawsuit) that the P/E alone doesn’t reveal. A low P/E relative to peers isn’t automatically a bargain.
Don’t ignore growth within the sector. Two tech companies in the same sector with very different growth rates can still justify different P/E ratios. This is where the PEG ratio becomes useful: it adjusts the P/E for growth rate, helping you compare companies that are growing at meaningfully different speeds.
Use forward P/E for growth-sensitive sectors. In tech and healthcare, the trailing P/E (based on last year’s earnings) can look elevated because the market is pricing in future growth. Most analysts prefer the forward P/E, which uses projected earnings for the next 12 months. Your brokerage app typically shows both.
What this means for your investing
For most everyday investors, sector-aware P/E analysis has a few practical uses:
Sanity-checking a single stock. If someone tips you on a utility company with a P/E of 35, that’s worth pausing on. The typical range is 14–20x. What’s driving that premium? If there’s no clear answer, that’s a yellow flag. If you’re learning how to analyze a stock for beginners, sector-relative P/E is one of the first filters to apply.
Comparing competitors head-to-head. When you’re evaluating two companies in the same sector, the P/E gap between them tells a story. The more expensive one needs to justify its premium: faster growth, better margins, or a stronger competitive position.
Evaluating “cheap” stocks more honestly. Energy and financials often trade at low absolute P/E ratios, which can make them look like obvious bargains. But low multiples in cyclical sectors often reflect real risk: earnings that can collapse quickly when conditions turn. Cheap on P/E isn’t the same as cheap on value.
The goal isn’t to memorize sector P/E averages. It’s to build a reflex: before reacting to a P/E number, ask yourself what normal looks like for that business. A number without a benchmark is just a number.
This content is for educational purposes only and does not constitute financial advice. investingforplebs.com is not a registered investment advisor. Please consult a qualified financial professional before making investment decisions.
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Sources: S&P 500 P/E Ratio by Year (Multpl) | S&P 500 Sectors P/E Ratios (NYU Stern) | S&P 500 P/E Ratio Historical Data (MacroTrends)
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