P/E vs PEG Ratio: Which to Trust, With NVIDIA and Meta

Why does the PEG ratio trip people up?

A low P/E looks cheap and a high P/E looks expensive. That's the instinct, and it's often wrong, because a company doubling its profits deserves a higher multiple than one standing still. The PEG ratio was built to fix that. But it swaps one problem for another: it hands the most important input, the growth rate, to you.

And there's no single "correct" growth rate. Last quarter, last year and next year can all give wildly different answers for the same stock on the same day. Let's walk through it with two real companies, NVIDIA and Meta, as examples. This is about the metric, not whether either stock is worth owning.

What's the difference between P/E and PEG?

P/E is the share price divided by earnings per share. PEG takes that P/E and divides it by the expected or recent earnings growth rate, written as a whole number. A P/E of 20.9 with 21.4% growth gives a PEG of about 0.98. Traditionally, a PEG near 1 means you're paying roughly in line with growth.

If P/E is new to you, our guide on what the P/E ratio is and why it matters covers the basics. The short version: P/E is a fact about price and past profits. PEG is a judgment, because the growth part is a choice.

The NVIDIA and Meta starting point

Take NVIDIA first. As of the close on Wednesday, October 28, 2026, the chipmaker's shares closed at $215.38, and the trailing P/E is 27.2x. That looks pricey until you bring in analysts' forward estimate for next fiscal year, which drops the forward P/E to 13.5x. It's a big gap, and it's worth digging into.

Those multiples come from trailing 12-month EPS of $7.91 and a forward EPS estimate of $15.91.

Meta, as of the same close, sat at $612.49, with a 20.9x trailing P/E and a 17.2x forward P/E. On P/E alone, Meta looks cheaper on trailing earnings and NVIDIA looks cheaper on forward earnings. That flip is the whole reason growth-adjusted metrics exist, since a plain P/E can't tell you which story to trust.

Look at where the two examples sit next to other large caps. A multiple only means something relative to the growth behind it.

How much does the growth input change the PEG?

A lot. Using the same price and the same trailing P/E, NVIDIA's PEG ranges from about 0.21 to 0.42, and Meta's ranges from 0.08 to 0.98, or isn't computable at all. The only thing that changes is which growth rate goes in the bottom of the fraction.

Growth input	NVDA growth	NVDA PEG	META growth	META PEG
Latest quarter earnings vs a year earlier	127.8%	0.21	264.8%	0.08
Last fiscal year net income growth	64.7% (fiscal 2026)	0.42	-3.1% (fiscal 2025)	Not meaningful
Next-year EPS estimate vs trailing EPS	about 101%	0.27	21.4%	0.98

Here's the thing. Every PEG in that table is "correct" arithmetic. Someone quoting Meta at 0.08 and someone quoting it at 0.98 can both be right about the math and still be describing very different bets.

When does PEG mislead you?

PEG misleads in three common situations: when one quarter's earnings are inflated by something that won't repeat, when growth is slowing so last year's rate overstates the future, and when growth is negative so the ratio flips sign. Meta's figures show the first and third, and NVIDIA's show the second.

Trap 1: one-off earnings

Meta's latest quarter shows earnings up 264.8% year over year, according to its quarterly figures. Revenue in that quarter grew 26.1%. When profits grow ten times faster than sales, something other than the core business is usually moving the number, often a weak or unusual comparison quarter. The summary figures don't break out the cause, and that's exactly why you shouldn't build a PEG on it.

The quarterly results are lumpy too. Meta reported $10.44 a share in the quarter announced April 29, 2026, against a $6.70 consensus estimate. The next quarter came in at $6.18 against $7.19 expected. Any growth rate pulled from swings like that will make PEG jump around.

Trap 2: negative growth

In fiscal 2025, Meta's revenue grew 22.2% but net income fell 3.1%. Divide a positive P/E by a negative growth rate and you get a negative PEG, which tells you nothing. So even though the top line was growing nicely, the standard growth-adjusted check breaks down completely for Meta here, and you'd need to look elsewhere.

Metric	Before	After
Diluted EPS	$23.86	$23.49
Operating margin	42.2%	41.4%
Net margin	37.9%	30.1%

Operating margin barely moved while net margin dropped, so the hit happened below operating income. A one-year figure like that can wreck a PEG while the business underneath keeps running.

Watch the dip and recovery in Meta's EPS path. A PEG calculated at the low point and one calculated after the rebound would tell opposite stories.

Trap 3: slowing growth

NVIDIA's net income growth went from 581.3% in fiscal 2024 to 144.9% in fiscal 2025 and 64.7% in fiscal 2026. Still fast. But each year's rate was well below the one before. Plug a past peak into PEG and the stock looks absurdly cheap, because the ratio quietly assumes the old pace continues.

NVIDIA's earlier history shows the other side. Net income fell 55.2% in fiscal 2023, with diluted EPS dropping from $0.38 to $0.17. A PEG run that year would have been negative and useless, right before EPS climbed to $4.90 by fiscal 2026. Our guide to earnings per share explains why EPS swings like this deserve a closer look.

Notice how steep the climb is compared with the flat early years. The steeper the curve, the more a PEG depends on whether that slope holds.

So which number should you trust?

Trust P/E as the fact and PEG as the question. P/E is anchored to earnings a company actually reported. PEG adds a growth assumption, so it's only trustworthy when growth is positive, steady across several periods, and not driven by a single quarter. Neither of these two examples passes every test cleanly.

NVIDIA comes closest on consistency: revenue grew at a 68.3% compound annual rate from fiscal 2022 to fiscal 2026, and the trailing 27.2x multiple sits on real, repeated profit growth. Even so, its forward PEG of about 0.27 rests on analysts expecting EPS to roughly double. That's an estimate, not a result. Meta's sensible reading is the forward one near 0.98, because its revenue growth has been steadier than its earnings. You can see how one framework weighs all this in our NVIDIA Stock Audit deep dive.

The bigger point: when PEG gives a wildly low number, assume the growth input is the problem before assuming the stock is a bargain. The free Stock Audit puts valuation next to profitability, growth and balance sheet checks, so a single ratio doesn't carry the whole decision.

How to use this in your own research

Start with P/E, then calculate PEG yourself with at least two growth inputs. If the answers are close, PEG is telling you something. If they're far apart, the gap is the real finding, and your job is to figure out which growth rate is believable.

• Pull trailing and forward P/E, and note the date of the price.
• Compute PEG with last fiscal year's growth, the forward estimate, and the latest quarter.
• Throw out any PEG built on negative growth or a quarter where earnings grew far faster than revenue.
• Check whether growth has been slowing year by year, as NVIDIA's has.
• Recheck after each report. NVIDIA's next scheduled earnings date is Tuesday, November 17, 2026, which will reset its trailing EPS and growth rate.

You can run these checks on any ticker with a free Stock Audit on NVDA or any other stock, and the 30-minute guide walks through the full process.

Frequently Asked Questions

What is a good PEG ratio?

The traditional rule of thumb says a PEG near 1 means you're paying roughly in line with growth, and below 1 suggests growth may be underpriced. But that only holds when the growth rate is positive, sustainable and not inflated by a one-time jump. A low PEG built on a single quarter's spike is a warning sign, not a signal of value.

Should I use trailing or forward P/E in the PEG ratio?

Either works if you stay consistent and say which one you used. Trailing P/E is based on reported earnings, so it's firmer. Forward P/E already bakes in growth, so dividing it by growth again can double count. NVIDIA's gap between a 27.2x trailing and 13.5x forward P/E shows how much the choice moves the result.

Can the PEG ratio be negative?

Yes. If earnings shrank over the period you measure, the growth rate is negative and so is the PEG. A negative PEG has no useful meaning, so most investors skip it and look at other measures, such as price-to-sales or free cash flow, until earnings growth turns positive again and a growth-adjusted comparison makes sense.

Does PEG work for dividend-paying companies?

It works less well for slower growers that return a lot of cash, because PEG ignores dividends entirely. Both examples here pay small dividends, with yields of 0.46% for NVIDIA and 0.34% for Meta, so it barely matters for them. For high-yield, low-growth companies, some investors add the dividend yield to the growth rate before dividing.

Why do different websites show different PEG ratios for the same stock?

Each site picks its own growth input: one-year historical, five-year estimates, or next year's analyst forecast, and some use trailing P/E while others use forward. Since PEG is so sensitive to that choice, two sites can be several times apart. Always check which growth rate a quoted PEG uses before comparing it with anything else.