How can IV give an indication of the markets opinion about a stock when there's no such thing as IV for a stock?
Since near-term at-the-money (ATM) options are generally the most liquid, the listed implied vol for a stock is usually pretty close to the nearest ATM volatility, but there's not a set convention that I'm aware of.  Also note that for most stocks, vol skew (the difference in vol between away-from-the-money and at-the-money options) is relatively small,  correct me if I'm wrong, IV is the markets assessment that the stock is about 70% likely (1 Standard Deviation) to move (in either direction) by that percent over the next year. Not exactly.  It's an annualized standard deviation of the anticipated movements over the time period of the option that it's implied from.  Implied vol for near-term options can be higher or lower than longer-term options, depending on if the market believes that there will be more uncertainty in the short-term.  Also, it's the bounds of the expected movement in that time period. so if a stock is at $100 with an implied vol of 30% for 1-year term options, then the market thinks that the stock will be somewhere between $70 and $130 after 1 year.  If you look at the implied vol for a 6-month term option, half of that vol is the range of expected movement in 6 months.
To get the probability of hitting a target price you need a little more math and an assumption about the expected return of your stock.  First let's examine the parts of this expression. IV is the implied volatility of the option.  That means it's the volatility of the underlying that is associated with the observed option price.  As a practical matter, volatility is the standard deviation of returns, expressed in annualized terms.  So if the monthly standard deviation is Y, then Y*SQRT(12) is the volatility. From the above you can see that IV*SQRT(DaysToExpire/356) de-annualizes the volatility to get back to a standard deviation.  So you get an estimate of the expected standard deviation of the return between now and expiration. If you multiply this by the stock price, then you get what you have called X, which is the standard deviation of the dollars gained or lost between now and expiration.  Denote the price change by A (so that the standard deviation of A is X). Note that we seek the expression for the probability of hitting a target level, Q, so mathematically we want 1 - Pr( A < Q - StockPrice)  We do 1 minus the probability of being below this threshold because cumulative distribution functions always find the probability of being BELOW a threshold, not above. If you are using excel and assuming a mean of zero for returns, the probability of hitting or exceeding Q at expiration, then, is That's your answer for the probability of exceeding Q. Accuracy is in the eye of the beholder.  You'd have to specify a criterion by which to judge it to know the answer.  I'm sure more sophisticated methods exist that are more unbiased and have less error, but I think it's a fine first approximation. You can't get there from here.  This isn't the right data.  Consider the following five-year history:  2%, 16%, 32%, 14%, 1%.  That would give a 13% average annual return.  Now compare to -37%, 26%, 15%, 2%, 16%.  That would give a 4% average annual return.   Notice anything about those numbers?  Two of them are in both series.  This isn't an accident.  The first set of five numbers are actual stock market returns from the last five years while the latter five start three years earlier.  The critical thing is that five years of returns aren't enough.  You'd need to know not just how you can handle a bull market but how you do in a bear market as well.  Because there will be bear markets.   Also consider whether average annual returns are what you want.  Consider what actually happens in the second set of numbers:   But if you had had a steady 4% return, you would have had a total return of 21%, not the 8% that would have really happened.  The point being that calculating from averages gives misleading results.  This gets even worse if you remove money from your principal for living expenses every year.   The usual way to compensate for that is to do a 70% stock/30% bond mix (or 75%/25%) with five years of expenses in cash-equivalent savings.  With cash-equivalents, you won't even keep up with inflation.  The stock/bond mix might give you a 7% return after inflation.  So the five years of expenses are more and more problematic as your nest egg shrinks.  It's better to live off the interest if you can.  You don't know how long you'll live or how the market will do.   From there, it's just about how much risk you want to take.  A current nest egg of twenty times expenses might be enough, but thirty times would be better.  Since the 1970s, the stock market hasn't had a long bad patch relative to inflation.  Maybe you could squeak through with ten.  But if the 2020s are like the 1970s, you'd be in trouble. The Level 2 data is simply showing the depth of the market. If I am trading shares with my broker I have the option of viewing only the top 10 bid/ask prices in the depth or all of the data (which sometimes can be a very long list). With another broker I get the top ten bid and ask prices and how many orders are available for each price level, or I have the option of listing each order separately for each price level (in order of when the order was placed). I get the same kind of data if trading options. I do not know about futures because I don't trade them. Simply this data may be important to a trader because it may give an indication of whether there are more buyers or sellers in the market, which in turn may (but not always) give an indication of which way the market may be moving. As an example the price depth below shows WBC before market open with sellers outweighing the buyers in both numbers and volume.  This gives an indication that prices may drop when the market opens. Of course there could be some good news coming out prior to market open or just after, causing a flood of buyers into the market and sellers to cancel their orders. This would change everything around with more buyers than sellers and indicate that prices may now be going up. The market depth is an important aspect to look at before putting an order in, as it can give an indication of which way the market is moving, especially in a very liquid security or market. Dividends are normally paid in cash, so don't generally affect your portfolio aside from a slight increase to 'cash'.  You get a check for them, or your broker would deposit the funds into a money-market account for you.  There is sometimes an option to re-invest dividends, See Westyfresh's answer regarding Dividend Re-Investment Plans. As Tom Au described, the dividends are set by the board of directors and announced.  Also as he indicated just before the 'record' date, a stock which pays dividends is worth slightly more (reflecting the value of the dividend that will be paid to anyone holding the stock on the record date) and goes down by the dividend amount immediately after that date (since you'd now have to hold the stock till the next record date to get a dividend)  In general unless there's a big change in the landscape (such as in late 2008) most companies pay out about the same dividend each time, and changes to this are sometimes seen by some as 'indicators' of company health and such news can result in movement in the stock price. When you look at a basic quote on a ticker symbol there is usually a line for Div/yeild which gives the amount of dividend paid per share, and the relative yeild (as a percentage of the stock price).  If a company has been paying dividends, this field will have values in it, if a company does not pay a dividend it will be blank or say NA (depending on where you get the quote).  This is the easiest way to see if a company pays a dividend or not.  for example if you look at this quote for Google, you can see it pays no dividend  Now, in terms of telling when and how much of a dividend has been paid, most financial sites have the option when viewing a stock chart to show the dividend payments.  If you expand the chart to show at least a year, you can see when and how much was paid in terms of dividends.  For example you can see from this chart that MSFT pays dividends once a quarter, and used to pay out 13 cents, but recently changed to 16 cents.   if you were to float your mouse over one of those icons it would also give the date the dividend was paid. No matter how a company releases relevant information about their business, SOMEBODY will be the first to see it. I mean, of all the people looking, someone has to be the first. I presume that professional stock brokers have their eyes on these things closely and know exactly who publishes where and when to expect new information. In real life, many brokers are going to be seeing this information within seconds of each other. I suppose if one sees it half a second before everybody else, knows what he's looking for and has already decided what he's going to do based on this information, he might get a buy or sell order in before anybody else. Odds are that if you're not a professional broker, you don't know when to expect new information to be posted, and you probably have a job or a family or like to eat and sleep now and then, so you can't be watching somebody's web site constantly, so you'll be lagging hours or days behind the full-time professionals. The term 'interest' tends to be used loosely when discussing valuation of stocks.  Especially when referring to IRAs which are generally the purvey of common-folk who aren't in the finance industry.  Often it is used colloquially to include: Using this definition (which is what I'm guessing your IRA Calculator is doing), your stock would have increased in value by a total of $26 over the course of 10 months.  Still not terribly good (only a couple percent increase), but certainly not a couple cents. The value of a share depends on the value of the company, which involves a lot more than the value of its assets -- it requires making decisions about what you think will happen to the company in the future. That's inherently not something that can be reduced to a single formula, at least not unless you can figure out how to represent your guesses and your confidence in them in the formula ... and even if you could do all that it would only say what you think the stock is worth; others will be using different numbers and legitimately get different results. Disagreement over value is what the stock market is all about, I'm afraid. There are books on the subject of valuing stocks. P/E ratio has nothing directly to do with the value of a company. It may be an indication that the stock is undervalued or overvalued, but does not indicate the value itself. The direct value of company is what it would fetch if it was liquidated. For example, if you bought a dry cleaner and sold all of the equipment and receivables, how much would you get? To value a living company, you can treat it like a bond. For example, assume the company generates $1 million in profit every year and has a liquidation value of $2 million. Given the risk profile of the business, let's say we would like to make 8% on average per year, then the value of the business is approximately $1/0.08 + $2 = $14.5 million to us. To someone who expects to make more or less the value might be different. If the company has growth potential, you can adjust this figure by estimating the estimated income at different percentage chances of growth and decline, a growth curve so to speak. The value is then the net area under this curve.  Of course, if you do this for NYSE and most NASDAQ stocks you will find that they have a capitalization way over these amounts. That is because they are being used as a store of wealth. People are buying the stocks just as a way to store money, not necessarily make a profit. It's kind of like buying land. Even though the land may never give you a penny of profit, you know you can always sell it and get your money back. Because of this, it is difficult to value high-profile equities. You are dealing with human psychology, not pennies and dollars.