What is the p/e ratio?
The price to earnings ratio is a measure of the company's current share price compared to the annual net earnings per share.  The other way to think about this is the number of years a company would take to pay back the share price if the earnings stay constant.  This ignores factors like inflation and can be used as an indicator of risk.  During the internet bubble many companies had P/E above 24 and no possible means of earning back the share prices that were inflated largely due to speculation. Most tools like Google Finance will list the P/E for a particular quote. The PE ratio stands for the Price-Earnings ratio. The price-earnings ratio is a straightforward formula: Share Price divided by earnings per share. Earnings per share is calculated by dividing the pre-tax profit for the company by the number of shares in issue. The PE ratio is seen by some as a measure of future growth of a company. As a general rule, the higher the PE, the faster the market believes a company will grow. This question is answered on our DividendMax website: http://www.dividendmax.co.uk/help/investor-glossary/what-is-the-pe-ratio Cheers PE ratio is the current share price divided by the prior 4 quarters earnings per share. Any stock quote site will report it. You can also compute it yourself. All you need is an income statement and a current stock quote.
"To perhaps better explain the ""why"" behind this rule of thumb, first think of what it means when the P/E ratio changes.  If the P/E ratio increases, then this means the stock has become more expensive (in relative terms)--for example, an increase in the price but no change in the earnings means you are now paying more for each cent of earnings than you previously were; or, a decrease in the earnings but no change in the price means you are now paying the same for less earnings. Keeping this in mind, consider what happens to the PE ratio when earnings increase (grow)-- if the price of the stock remains the same, then the stock has actually become relatively ""cheaper"", since you are now getting more earnings for the same price.  All else equal, we would not expect this to happen--instead, we would expect the price of the stock to increase as well proportionate to the earnings growth.  Therefore, a stock whose PE ratio is growing at a rate that is faster than its earnings are growing is becoming more expensive (the price paid per cent of earnings is increasing).  Similarly, a stock whose PE ratio is growing at a slower rate than its earnings is becoming cheaper (the price paid per cent of earnings is decreasing).  Finally, a stock whose P/E ratio is growing at the same rate as its earnings are growing is retaining the same relative valuation--even though the actual price of the stock may be increasing, you are paying the same amount for each cent of the underlying company's earnings." "Some companies have a steady, reliable, stream of earnings. In that case, a low P/E ratio is likely to indicate a good stock. Other companies have a ""feast or famine"" pattern, great earnings one year, no earnings or losses the following year. In that case, it is misleading to use a P/E ratio for a good year, when earnings are high and the ratio is low. Instead, you have to figure out what the company's AVERAGE earnings may be for some years, and assign a P/E ratio to that." It's been traded publicly for only about a month.  I wouldn't put much credence in a P/E ratio just yet because it hasn't had to report anything like a grown-up publicly traded company yet. Let's take a step back. My fictional company 'A' is a solid, old, established company. It's in consumer staples, so people buy the products in good times and bad. It has a dividend of $1/yr. Only knowing this, you have to decide how much you would be willing to pay for one share.  You might decide that $20 is fair. Why? Because that's a 5% return on your money, 1/20 = 5%, and given the current rates, you're happy for a 5% dividend. But this company doesn't give out all its earnings as a dividend. It really earns $1.50, so the P/E you are willing to pay is 20/1.5 or 13.3.  Many companies offer no dividend, but of course they still might have earnings, and the P/E is one metric that used to judge whether one wishes to buy a stock.  A high P/E implies the buyers think the stock will have future growth, and they are wiling to pay more today to hold it. A low P/E might be a sign the company is solid, but not growing, if such a thing is possible. P/E can use various estimates in its calculation as one could speculate about future P/E rations and thus could determine a future valuation if one is prepared to say that the P/E should be X for a company. Course it is worth noting that if a company isn't generating positive earnings this can be a less than useful tool, e.g. Amazon in the 1990s lost money every quarter and thus would have had a N/A for a P/E. PEG would use P/E and earnings growth as a way to see if a stock is overvalued based on projected growth. If a company has a high P/E but has a high earnings growth rate then that may prove to be worth it. By using the growth rate, one can get a better idea of the context to that figure. Another way to gain context on P/E would be to look at industry averages that would often be found on Yahoo! Finance and other sites. "P/E is price to earnings, or the price of the company divided by annual earnings. Earnings, as reported, are reported on accrual basis. Accrual basis accounting is...without going too deep, like taking a timeline, chopping it up and throwing different bits and pieces of every year into different piles.  Costs from 2008 might show up in 2011, or the company might take costs in 2011 that aren't necessarily costs until 2012.  Examples would include one-time charges for specific investments, like new shipping centers, servers for their hosting services, etc.    Free cash flow is the amount of cash Amazon is generating from its operations. Free cash flow is almost always different from earnings because it's the amount of Earnings + adjustments for non-cash activities - capital expenditures (long-term investments.)  Earnings is one thing.  Cash generation is a completely different animal.  There are plenty of companies that ""earn"" billions, but only have a few hundred million in cash to show for it because their earnings have to be reinvested into new stuff to grow/maintain the business.  To have a free cash flow yield of 2.5% is to have a company valued at $40 for each $1 of free cash flow that the company generates each year.  $1/$40 = 2.5%.  SGA = Selling, General, &amp; Administrative expenses.  These are the costs of running the company - paying salaries, advertising, etc.  This cost is second only to COGS, which is Cost of Goods Sold.    Currently, Amazon pays $.774 for every $1 product it sells.  Its operations add another ~$.20 to that total.  After taxes, Amazon keeps about 2 cents of every dollar's worth of product it sells.  This 2 cents is Amazon's net margin of 2%.  Net margin is (net income)/(sales).  If Amazon earned $3 for every $100 in sales it would have a net margin of 3%.     Let me know if this makes no sense.  If there's anything in particular that is especially confusing, definitely reply and I'll better clarify on specific items.  Fire away with any questions, also.  I love to discuss finance and accounting." I look at the following ratios and how these ratios developed over time, for instance how did valuation come down in a recession, what was the trough multiple during the Lehman crisis in 2008, how did a recession or good economy affect profitability of the company. Valuation metrics: Enterprise value / EBIT (EBIT = operating income) Enterprise value / sales (for fast growing companies as their operating profit is expected to be realized later in time) and P/E Profitability: Operating margin, which is EBIT / sales Cashflow / sales Business model stability and news flow "To calculate a sector (or index) P/E ratio you need to sum the market caps of the constituent stocks and divide it by the sum of the total earnings of the constituent stocks (including stocks that have negative earnings).  There are no ""per share"" figures used in the calculation. Beware when you include an individual stock that there may be multiple issues associated with the company that are not in the index.... eg. Berkshire Hathaway BRK.B is in the S&P 500 but BRK.A is not.  In contrast, Google has both GOOGL and GOOG included in the S&P 500 index but not its unlisted Class B shares.  All such shares need to be included in the market cap and figuring out the different share class ratios can be tricky." The article is talking about relative cost. You could use the cash Schiller P/E ratio as a proxy. That's unit of price per unit of earning. The answer to your question is one time in history, during the 2000 dot com bubble. It's higher than 2008 before the downturn. You are paying more for the same earnings. That has nothing to do with the size of the economy and everything to do with interest rates being too low for too long Yeah I agree with you. I wasn't referring to Tesla though, as I'm from South Africa so I only look in to local investments and I don't really know their story in terms of financials. Was just speaking about PE ratios in general :) Just from my experience and observation... VC there are spikes of activity.  Where many deals are closing and board meetings and issues pile up on top of each other and happen all at once.  But VC there are lulls where not much is going on.  PE is more consistent and predictable in general.  Yes of course exceptions arise but I found PE to be more 9 to 5 ish. "The mathematics site, WolframAlpha, provides such data. Here is a link to historic p/e data for Apple. You can chart other companies simply by typing ""p/e code"" into the search box.  For example, ""p/e XOM"" will give you historic p/e data for Exxon. A drop-down list box allows you to select a reporting period : 2 years, 5 years, 10 years, all data.  Below the chart you can read the minimum, maximum, and average p/e for the reporting period in addition to the dates on which the minimum and maximum were applicable." "Check your math... ""two stocks, both with a P/E of 2 trading at $40 per share lets say, and one has an EPS of 5 whereas the other has an EPS of 10 is the latter a better purchase?"" If a stock has P/E of 2 and  price of $40 it has an EPS of $20. Not $10. Not $5." **Volume-weighted average price**  In finance, volume-weighted average price (VWAP) is the ratio of the value traded to total volume traded over a particular time horizon (usually one day). It is a measure of the average price at which a stock is traded over the trading horizon.  VWAP is often used as a trading benchmark by investors who aim to be as passive as possible in their execution. Many pension funds, and some mutual funds, fall into this category.  ***  ^[ [^PM](https://www.reddit.com/message/compose?to=kittens_from_space) ^| [^Exclude ^me](https://reddit.com/message/compose?to=WikiTextBot&amp;message=Excludeme&amp;subject=Excludeme) ^| [^Exclude ^from ^subreddit](https://np.reddit.com/r/finance/about/banned) ^| [^FAQ ^/ ^Information](https://np.reddit.com/r/WikiTextBot/wiki/index) ^| [^Source](https://github.com/kittenswolf/WikiTextBot)   ^] ^Downvote ^to ^remove ^| ^v0.24 Usually their PE ratio will just be listed as 0 or blank.  Though I've always wondered why they don't just list the negative PE as from a straight math standpoint it makes sense. PE while it can be a useful barometer for a company, but certainly does not tell you everything.  A company could have negative earnings for a lot of reasons, some good and some bad.  The company could just be a bad company and could be losing money hand over fist, or the company could have had a one time occurrence such as a big acquisition or some other event that just affected this years earnings, or they could be an awesome high growth company that is heavily investing for their future and forgoing locking in profits now for much bigger profits in the future. Generally IPO company's fall into that last category as they are going public usually because they want an influx of cash that they are going to use to grow the company much more rapidly.  So they are likely already taking all incoming $$ and taking on debt to grow the company and have exceeded all of those options and that's when they turn to the stock market for the additional influx of cash, so it is very common for these companies not to have earnings.   Now you just have to decide if that company is investing that money wisely and will in the future translate to actual earnings.