Trailing PE vs Forward PE Ratio

Differences between Trailing PE vs. Forward PE Ratio

Trailing PE uses earnings per share of the company over the period of the previous 12 months for calculating the price-earnings ratio, whereas Forward PE uses the forecasted earnings per share of the company over the period of the next 12 months for calculating the price-earnings ratioPrice-earnings RatioThe 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.

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Source: Trailing PE vs Forward PE Ratio (wallstreetmojo.com)

What is Trailing PE Ratio

Trailing PE Ratio is where we use the Historical Earning Per share in the denominator.

Trailing PE Ratio Formula (TTM or Trailing Twelve Months) = Price Per Share / EPS over the previous 12 months.

Trailing PE Ratio Example

Let us calculate the Trailing PE Ratio of Amazon.

Amazon Current Share Price = 1,586.51 (as of 20th March, 2018)

Trailing vs Forward PE

source: reuters.com

  • Earnings Per Share (TTM) of Amazon = EPS (Dec,2017) + EPS (Sep 2017) + EPS (June 2017) + EPS (March, 2017) = 2.153 + 0.518 + 0.400 + 1.505 = $4.576
  • PE (TTM) = Current Price / EPS (TTM) = 1586.51 / 4.576 = 346.7x

What is Forward PE Ratio

Let us now look at how to calculate Forward PECalculate Forward PEForward PE ratio uses the forecasted earnings per share of the company over the next 12 months for calculating the price-earnings ratio. Forward PE ratio formula = Price per share/Projected earnings per share read more Ratio using Formula –

Forward PE Ratio Formula = Price Per Share / Forecasted EPS over the next 12 months

Forward PE Ratio Example

Amazon Current Share Price = 1,586.51 (as of 20th March 2018)

Forward EPS Amazon

Forward EPS (2018) of Amazon = $8.31

Forward EPS (2019) of Amazon = $15.39

  • Forward PE Ratio (2018) = Current Price / EPS (2018) = 1,586.51/8.31 = 190.91x
  • Forward PE Ratio (2019) = Current Price / EPS (2019) = 1,586.51/15.39 = 103.08x

Trailing PE vs Forward PE Ratio

As you can note from above, the key difference between the two is the EPS used. For Trailing PE, we use the historical EPS, whereas, for Forward PE, we use EPS forecasts.

Trailing PE vs. Forward PE Ratio Example

Trailing PE Ratio uses the Historical EPS, while Forward PE Ratio uses the Forecast EPS. Let us look at the below example to calculate the Trailing PE vs. forwarding PE Ratio.

Trailing PE and Forward PE Example

Company AAA, Trailing Twelve Months EPS is $10.0, and its Current Market Price is $234.

  • Trailing Price Earning Ratio formula = $234 / $10 = $23.4x

Likewise, let us calculate the Forward Price Earning Ratio of Company AAA. Company AAA 2016 estimated EPS is $11.0, and its current price is $234.

  • Forward Price Earning Ratio formula = $234 / $11 = $21.3x

Trailing PE vs Forward PE Ratio (Important points to note)

Some of the things to consider regarding the Trailing Price Earning Ratio vs. Forward Price Earning Ratio.

Trailing and Forward Price Earning Ratio – Quick Question

Rudy Comp reported $32million in earnings during FY2015. An analyst forecasts an EPS over the next twelve months of $1.2. Rudy has 25 million shares outstandingShares OutstandingOutstanding shares are the stocks available with the company's shareholders at a given point of time after excluding the shares that the entity had repurchased. It is shown as a part of the owner's equity in the liability side of the company's balance sheet.read more at a market price of $20/share. Calculate Rudy’s trailing and leading P/E ratio. If the 5 years historical average Price Earning Ratio is 15x, whether Rudy Comp is overvalued or undervalued?

Answer – Please drop your answers in the comment box.

Trailing PE vs. Forward PE Ratio Video

This article has been a guide to key differences between Trailing PE vs. Forward PE Ratios. Here we also take practical examples of calculating trailing PE and forward PEs and important notes to consider when using these in equity valuation.

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