## What is PEG Ratio Formula?

The term “PEG ratioPEG RatioThe PEG ratio compares the P/E ratio of a company to its expected rate of growth. A PEG ratio of 1.0 or lower, on average, indicates that a stock is undervalued. A PEG ratio greater than 1.0 indicates that a stock is overvalued.read more” or Price/Earnings to Growth ratio refers to the stock valuation method based on the growth potential of the company’s earnings. The formula for the PEG ratio is derived by dividing the stock’s price-to-earningsPrice-to-earningsThe price to earnings (PE) ratio measures the relative value of the corporate stocks, i.e., whether it is undervalued or overvalued. It is calculated as the proportion of the current price per share to the earnings per share. read more (P/E) ratio by the growth rate of its earnings for a specified time period.

PEG Ratio Formula can be expressed as below,

**PEG Ratio Formula = P/E Ratio / Earnings Growth Rate**

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For eg:

Source: PEG Ratio Formula (wallstreetmojo.com)

where,

P/E ratio = Stock Price / Earnings per share

There are two methods of calculating the PEG ratio, and they are:

- Forward PEG
- Trailing PEG

**Forward PEG:** In this method, the earnings growth rate is determined on the basis of annualized future growth rate for a certain period of time, usually a period of up to five years.

**Trailing PEG:** In this method, the earnings growth rate is determined on the basis of the stock’s trailing growth rates. The sources of such growth rate could be from the previous 12 months, last fiscal year, or some sort of multiple-year historical average.

### Explanation

The PEG ratio formula calculation is simply done by using the following four steps:

**Firstly, determine the current price of the company stock from the stock market.****Next, determine the net income of the company from the income statement. Then, figure out the portion of the profit going to the shareholders after the deduction of preference dividendsPreference DividendsPreferred dividends refer to the amount of dividends payable on preferred stock from profits earned by the company, and preferred stockholders have priority in receiving such dividends over common stockholders.read more. Now, divide the portion of the net income by the outstanding no. of shares to arrive at the earnings per share or EPSEarnings Per Share Or EPSEarnings Per Share (EPS) is a key financial metric that investors use to assess a company's performance and profitability before investing. It is calculated by dividing total earnings or total net income by the total number of outstanding shares. The higher the earnings per share (EPS), the more profitable the company is.read more.****EPS = (Net income – Preference dividends) / No. of outstanding equity shares****Next, divide the current stock price of the company by its earnings per share to calculate the P/E ratio.****Next, determine the future earnings growth rate based on the financial projection of the company as per the forwarding PEG ratio method. The financial projectionThe Financial ProjectionFinancial projection is a statistical forecast of a company's future revenue and expenditure based on historical market patterns, internal factors, data interpretation, anticipated market developments, and experiences. To meet production or sales targets, both short-term and long-term financial estimates are sometimes evaluated.read moreFinancial projection is a statistical forecast of a company's future revenue and expenditure based on historical market patterns, internal factors, data interpretation, anticipated market developments, and experiences. To meet production or sales targets, both short-term and long-term financial estimates are sometimes evaluated.read moreFinancial projection is a statistical forecast of a company's future revenue and expenditure based on historical market patterns, internal factors, data interpretation, anticipated market developments, and experiences. To meet production or sales targets, both short-term and long-term financial estimates are sometimes evaluated.read more is prepared on the basis of the company-specific plans and future growth potential of the industry and market overall. On the other hand, the PEG ratio can be derived by using the past performance of the company as per the Trailing PEG ratio.****Finally, the formula for PEG ratio calculation is derived by dividing the P/E ratio by the growth rate of its earnings for a specified time period, as shown below.****PEG ratio = P/E ratio / Earnings growth rate**

### Example of PEG Ratio Formula (with Excel Template)

Let’s see some simple examples of PEG Ratio Formula to understand it better.

**Let us take the example of company ABZ Ltd which is in the business of manufacturing mobile phones. The company has witnessed a tremendous change in the market potential with the launch of its new product, and as such, future growth is expected to be higher than in the past. The stock of the company is currently trading at $65 per share. **

Below is given data for calculation of forwarding PEG ratio and a trailing PEG ratio of company ABZ Ltd

**P/E Ratio**

Therefore, the calculation of the P/E ratio will be as follows

P/E ratio = Current price / EPS for FY18 = $65 / $3.61

P/E Ratio= 18.00

**Trailing Earnings Growth Rate**

Therefore, the Earnings growth rate for the trailing five years can be calculated as,

The earnings growth rate for trailing five years = (EPS for FY18 / EPS for FY14)^{1/4} – 1

= ($3.610 / $3.000)^{1/4} – 1

Trailing Earnings Growth Rate = 4.74%

**Trailing PEG Ratio**

Therefore, the calculation of the Trailing PEG ratio will be as follows,

Trailing PEG ratio = 18.00 / 4.74

Trailing PEG Ratio= **3.80**

**Forward Earnings Growth Rate**

Therefore, the calculation of the Earnings growth rate for the future five years will be as follows

The Earnings growth rate for future five years = (EPS for FY23P / EPS for FY18)^{1/5} – 1

=($6.078 / $3.610)^{1/5} – 1

Forward Earnings Growth Rate = 10.98%

**Forward PEG Ratio**

Therefore, the calculation of Forward PEG ratio will be as follows,

Therefore, Forward PEG ratio = 18.00 / 10.98

Forward PEG Ratio= **1.64**

Therefore, it can be seen that the PEG ratio is expected to improve in the coming years, which is a good indication for the company.

### Relevance and Use

It is very important to understand the concept of the PEG ratio because an investor uses this ratio to analyze the earning potential of a stock. A stock with a low P/E ratio may seem like a good buy, but then taking the company’s growth rate into account to derive the PEG ratio of the stock, the story might change a lot. Additionally, a lower PEG ratio indicates that the stock may be undervalued, given its earnings performance. The degree of variation (a spread of over or under-priced stock) of the PEG ratio varies across the industry and across company type.

However, there is a broad rule of thumb that it is desirable to have a PEG ratio of less than one. Further, the accuracy of the PEG ratio is as good as the inputs used, and so one should be careful in using the input data. For instance, the use of historical growth rates may end up providing an inaccurate PEG ratio if the future growth potential is likely to deviate from historical growth rates. Consequently, calculation methods using future growth and historical growth are distinguished by the terms “forward PEG” and “trailing PEG,” respectively.

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Vinay M says

Nicely explained. Thanks

Dheeraj Vaidya says

Thanks for your kind words!