What do P/E ratios really mean? And do they matter?

Let's simplify and explain the ubiquitous price to rarnings ratio and more importantly, its significance to you as an ASX investor.

| More on:
a woman

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More

It is amazing how so many industries choose to hide behind their own jargon and acronyms. In IT, audio, and even the car industry – they all use terminology that makes them sound like experts in their own field but often fails to communicate with their customers.

Are we really expected to know what MBS, a signal to noise ratio or a VTEC system means?

(When I worked in with a large insurance company, I started a movement called "Axe the Acronym". You can imagine how well that went!)

The share market can be just as mystifying. So here, I will try to simplify and explain what one important term really means and more importantly, its significance to you as an investor.

So what is a P/E ratio?

The ubiquitous Price to Earnings Ratio – everyone talks about it – but how many people really understand its significance?

In the analysis of a company's financial state of health, its P/E ratio could be compared to the health of its blood system. The ratio can be arrived at by dividing a company's market capitalisation (that is, its share price multiplied by the number of shares issued) by its annual net profit.

In other words, if each share is $10 and there are 100 million shares issued, its market capitalisation is $1 billion. And, if the company's annual net profit is $50 million, its price to earnings ratio would be 20. If it showed a net profit of $200 million, its P/E ratio would be 5. Getting the picture?

Actual average ratio for the Australian stock market can vary between a low figure of 8 after a market crash up to around 25 in boom times.

Some revealing examples

 As I said, a company's P/E ratio is like the results of a medical. For example, National Australia Bank Ltd. (ASX: NAB) currently has a P/E ratio of around 13, while the Commonwealth Bank of Australia (ASX: CBA) has a higher P/E ratio of roughly 16. While these two big ASX banks are recording different results, the numbers place them both in the normal range.

In contrast, a share like Medical Developments International Ltd (ASX: MVP) has a huge P/E Ratio of around 520, yet its share price has more than doubled in the past 12 months! This illustrates that the P/E ratio is only one of the many factors you should study to determine your investment choices.

As always, it pays to be thorough.

Beware of smoke and mirrors

Of course, the honesty of some companies' profit declarations could be an issue and can grossly distort their P/E ratio. 'Clever' accounting can be employed to falsely inflate net profits. Close scrutiny of the company's balance sheet should reveal any chicanery. A key factor is whether the company's cash flow supports its profitability claims.

Once you've established an accurate P/E ratio, it can be a very valuable tool. The ratio is a gauge of market sentiment including general views of the company's quality of management, prospective profitability and other measures that contribute to an overall picture of its worth.

You can even study charts that plot a company's historic P/E performance and any sudden shifts should be viewed with suspicion.

A company's P/E ratio really does matter if you are looking for shares that have broad support with a set of hard financial facts to underpin their popularity amongst the investors.

Gregory Butler has no position in any of the stocks mentioned. The Motley Fool Australia's parent company Motley Fool Holdings Inc. owns shares of Medical Developments International Limited. The Motley Fool Australia owns shares of National Australia Bank Limited. The Motley Fool Australia has recommended Medical Developments International Limited. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Scott Phillips.

More on Share Market News

A group of young ASX investors sitting around a laptop with an older lady standing behind them explaining how investing works.
Broker Notes

Top brokers name 3 ASX shares to buy next week

Brokers gave buy ratings to these ASX shares last week. Why are they bullish?

Read more »

Three people gather around a large computer screen where they are looking at something that is captivating their interest with a graphic image of data and digital technology material superimposed to the right hand third of the image.
Share Market News

Here's how the ASX 200 market sectors stacked up last week

ASX tech shares led the market for a third consecutive week with a 4.63% increase.

Read more »

Mini house on a laptop.
Dividend Investing

Do ASX 200 dividend shares out-earn Aussie property?

We compare the forecast FY25 dividend yields of the top 10 ASX 200 companies to rental property yields.

Read more »

A fit woman in workout gear flexes her muscles with two bigger people flexing behind her, indicating growth.
Best Shares

Top ASX shares to buy with $500 in November 2024

$500 worth of ASX shares might not sound like a huge investment. But, to realise the benefits of compounding, you…

Read more »

A diverse group of people form a circle at a park and raise their arms together.
Share Market News

Here are the top 10 ASX 200 shares today

ASX investors ended the trading week on a high note this Friday...

Read more »

Broker Notes

Brokers name 3 ASX shares to buy today

Here's why brokers are feeling bullish about these three shares this week.

Read more »

A businessman looking at his digital tablet or strategy planning in hotel conference lobby. He is happy at achieving financial goals.
Share Gainers

Why Catapult, De Grey Mining, Domino's, and Nufarm shares are charging higher

These shares are ending the week strongly. But why?

Read more »

A young woman holds an open book over her head with a round mouthed expression as if to say oops as she looks at her computer screen in a home office setting with a plant on the desk and shelves of books in the background.
Healthcare Shares

This ASX All Ords share is diving 18% as inflation pain draws blood

This healthcare company delivered a trading update at its annual general meeting today.

Read more »