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How to calculate the value of a stock

Here are a few different ways to work out if a stock is cheap, fairly priced or overvalued compared to its competitors.

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If you’re new to share trading, it can be tricky to decide what to invest in and how to work out if it’s good value. You might decide to invest in a dairy brand, but how do you choose between similar companies such as Fonterra and a2 Milk? Perhaps you’ve heard friends and colleagues refer to one as “expensive” and the other as a “bargain” but aren’t sure how they determine this.

In this guide, we teach you some simple methods for comparing the share prices of similar companies and discuss why it’s essential to do so before spending your hard-earned dollars.

Why should I value shares before buying?

No-one wants to pay more for something than they need to, and we all love a bargain. The most basic goal of investing in shares is to buy when the price is low and sell when it’s high to make a profit.

Valuing a company’s shares against similar companies in the market is one of the easiest ways to do this. It can help you work out if you’re potentially paying too much for a stock if you’ve found a bargain buy, or if you’re holding onto a potentially overvalued stock in your portfolio that you’re better off selling and replacing with one of its competitors.

Technical vs fundamental analysis

There are 2 main methods used to value a stock: technical analysis and fundamental analysis. Technical analysis involves statistical charts and algorithms that analyse the share price movements to work out the underlying trend or market sentiment, based on the number of people buying and selling the stock. Some investors combine parts of both strategies into their valuations, but in this guide, we are only focusing on fundamental analysis as this is the more practical starting point for new investors.

Fundamental analysis focuses on the intrinsic value of the shares as well as the relative value. Intrinsic value is the “true” value of the shares based on the company’s fundamentals, that is, its financial statements including its earnings and debt. Relative value is determined by comparing businesses against their peers, for example, comparing the price of Contact Energy shares with Genesis Energy shares, or comparing Westpac shares with Commonwealth Bank shares. Let’s take a look at a few ways of determining a stock’s relative value.

3 ways to calculate the relative value of a stock

Many investors use ratios to decide whether a stock represents relative value compared with its peers. There is an endless list of ratios, and they’re most effective when used together to compare similar companies. Here are 3 popular ratios.

Price-earnings ratio (P/E)

The price-earnings ratio (P/E) looks at a company’s recent or forecasted earnings per share (EPS) against the current market price of its shares. EPS is the portion of the company’s profits (or earnings) allocated back to each individual share. You often see the term P/E with a number that is considered a “multiple” of the company’s earnings, which is a result of the ratio applied.

To figure out a company’s P/E, first look for its EPS figures, which is readily available in the company’s latest annual or quarterly report on its website. Then simply divide the current price per share by the EPS to find the P/E. (Tip: If the company has adjusted EPS figures, use these instead as they take into account any one-off major expenses for the reporting period that might affect the EPS figures.)

Example: Calculating the P/E

Let's say company ABC has a current share price of $100 and an EPS of $10, as stated in its latest report. By using this formula, the company's P/E would be 10.

* This is a fictional, but realistic, example.

The P/E ratio works best when comparing apples with apples, and most investors would argue a stock with a lower P/E compared to its peers is “cheaper” and may be undervalued. For example, if you’re considering 2 similar stocks in the financial industry and 1 has a P/E of 25 while the other has a P/E of 12, the latter is considered better value using this method alone. As an example, while there’s no definitive P/E that’s considered “good”, over the last 40 years the All Ordinaries (the oldest index, or tracking tool, of shares in Australia) has averaged a P/E of around 15, which is sometimes seen as a broad threshold for fair value.

Some investors are cautious when a P/E ratio increases substantially, as investor expectations about the company’s performance may have jumped ahead of the company’s actual earnings growth. Investors might get caught up in the market hype and anticipate sizeable future growth, but if targets go unmet this could lead to the share price being overvalued.

Price-earnings to growth ratio (PEG)

The price-earnings to growth (PEG) ratio considers a company’s earnings growth. To work this out, you need to find the company’s estimated earnings per share over the next year, which is included in its latest report. To calculate the PEG ratio, use the P/E ratio and divide by the growth in earnings per share (EPS).

Example: Calculating the PEG

Continuing on from our example of company ABC above, let's say the company has an estimated EPS of $11 over the next year as stated in its report, which is an increase of 10% on its current EPS of $10. Using the PEG formula of the P/E (10) divided by growth in EPS (10%), we have PEG of 1.

* This is a fictional, but realistic, example.

Like the P/E ratio, the PEG ratio compares peer performance. Again, there’s no set PEG ratio that is considered a definite “buy” signal, but fundamentalists may treat a stock with a PEG ratio below 1 as undervalued.

Price-book ratio (P/B)

Based on the underlying value of a company’s assets, the price-book (P/B) ratio offers a snapshot of a company’s value according to the book value of the assets on its balance sheet. P/B is calculated by dividing the current share price by the stock’s book value divided by the number of shares issued. The book value is worked out from the balance sheet as total assets minus total liabilities (or costs). The balance sheet with these figures is easy to locate in the company’s latest earnings report on its website.

Example: Calculating the P/B ratio

Consider company XYZ. Its market price is currently $2, with 50 million shares on issue. Total assets are $80 million and total liabilities are $20 million (this equals a book value of $60 million). Therefore, the P/B ratio is: $2 / (($80 million – $20 million)/50 million) = 1.7.

* This is a fictional, but realistic, example.

The closer the P/B ratio is to 1 (or below), the greater the perceived value of the stock. P/B is mostly used for mature companies with limited growth.

Some more tips to help you value a company’s shares

As well as the above ratios, which give you an idea of a stock’s relative value in line with similar companies, here are a couple more tips to help you work out if a stock is fairly priced or not.

  • Broker recommendations. Major brokers and banks like Goldman Sachs and JP Morgan release their own reports analysing certain companies. Within their analysis, they include either a buy (or strong buy), sell (or strong sell) or hold recommendation based on where they think the share price is heading.
  • Broker price targets. Within these broker reports, they also include a price target for the company’s shares. This price target is the price they believe the shares will reach within the next 12 months, based on their own analysis of the company and the market as a whole.

While relying on these broker reports to determine the intrinsic value or investment opportunities could be unwise, these reports may offer a broader picture for a stock’s fundamentals.

It’s important to note that solely using one of the methods outlined in this guide, to determine the intrinsic or fair value, isn’t a sure-fire way of analysing an investment opportunity. The subjective nature of determining relative value always leads to a variety of different opinions. Instead, you would benefit from a combination of these methods, as well as doing your own research into the company before making an investment decision.

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