# Calculator volatile for stock options

Author: the_godfather Date of post: 01.06.2017

Calculates Realized Volatility for your defined period. Graphs price vs market volatility. Volatility is the most crucial of all option trading concepts. Volatility indicators provide traders with an estimate of how much movement a stock can be expected to make over a given time frame. This is crucial in determining whether an option is likely to expire in or out of the money by the expiration date.

There are two types of volatility that we will be looking at: Implied Volatility and Historical Volatility. Historical Volatility is a statistical calculation that tells option traders how rapid price movements have been over a given time frame. The most common method of calculating historical volatility is called the Standard Deviation. Standard Deviation measures the dispersion of a set of data points from its average.

The more disperse spread out the data is, the higher the deviation. This deviation is referred by traders as volatility. Don't get too caught up in trying to understand the how's and whys of the standard deviation, just accept that all traders use this method for determining historical volatility. Or, you can download the Historical Volatility. Assets that have large and frequent price movements are said to be volatile or said to be of high volatility. Consequently, assets whose price movements are slow and predictable are said be low volatile instruments.

Take a look at the following examples of high and low volatile assets. Why is volatility so important to option traders?

Because volatility is a measure of the possible price changes of the asset in the future. Assets that have high volatility can be expected to have large price changes in the future. As a result, options that are based on assets with high volatility can be expected to have higher prices.

The higher the volatility, the more likely it is that the underlying asset will trade higher or lower than the exercise price by the expiry date.

### Hughes Optioneering

Implied volatility is the markets view of where volatility will be in the future. To determine an option's implied volatility, the trader must use a pricing model. Historical Volatility tells us how volatile as asset has been in the past.

Implied Volatility is the markets view on how volatile as asset will be in the future. When the market price of an option is higher than it's theoretical value based off past information it is considered expensive and so to if the market price of the option is less than the theoretical price, it is considered cheap. Another way to look at implied volatility is to compare the current level of implied volatility to the average level of implied volatility for the same option. It's a sound approach, however, building your own database of implied volatility data for every US stock requires a huge investment of time and resources.

If you're interested in this idea though, then I suggest you take a look at the Volcone Analyzer Pro by Options University. It instantly tells you if an option is cheap or expensive relative to the historical volatility levels.

Hi Lakru, When using Google, not all instruments are supported via their CSV download option. When checking a symbol on Google, go to Historical Prices and on the right hand side check for a Download CSV option I know that currently, HK stocks aren't on provided via CSV. However, I noticed that ETFs weren't provided a couple of months ago but have since been added Hello, I have a problem with using the table.

Whenever I press the "extract data" button, I get the following message: Symbol not found, or Yahoo! I have selected Google as the source, I do not know why the message mentions Yahoo. Anyway, I have macros enabled and I am quite sure I use correct ticker name eg. Hi Philip, Mmm, doesn't look like Google likes the HK data when accessed this way. I used the same code i. Let me look into it some more.

Send me an email so I have your address and can reply if I find a way around it. Hello, may I know how your revised speadsheet calculate the volatililty for stock in Hong Kong, e. Thank you so much for the new Worksheet update. I love it and had been using this spreadsheet for years now since Hi Luis, Unfortunately Yahoo doesn't provide historical data for FOREX - only quotes.

As soon as Yahoo add support for this FOREX historical data will just work like stocks do now with the spreadsheet. How about a similar sheet for FX? Should be a simple modification to the macro, but it is protected. Mmm, works fine for me. What symbol are you trying? Can you retrieve that data directly from the Yahoo! Have they changed the code? Yep, the lookback period is configurable, so you can enter if you like I chose 50 as a default arbitary value.

Shouldn't the rolling window be bigger than 50? When the sample is small you can get evolution of volatility just by chance - Say you had one day very extraordinary large observation, this was in day 1, and on day 51 you have relatively small observation. Once you delete day one and add day 51 you have a change and volatility become time varying.

I have seen that in other places day rolling window is used, that is why I am asking. There are couple of obvious fixes required to fit into actual trading volatility calculation, I think the most obvious one is there are not trading days, so you need to use trading days for the sqrt part. Peter - You're welcome. I thought that might be the case. The Offset method of defining a range is an incredibly powerful tool, one which seems to be little known or used, even among savvy Excel users.

I was one of them Keep up the good work! Hi Dave, Volatility Days certainly is used in the calculation When you hit the "Extract Data" button the array for the volatility calculation changes according to what you've entered into the "Volatility Days" cell. I do appreciate your formula below. The reason I included it in the Macro was because I didn't know how to do it with a formula ;- But now I know, thanks a lot Wont' accept less than symbol.

Copy it to all the cells in column D. Clearly the "Volatiliy Days" variable isn't used in the volatility calculations, but it can be. Now you can vary the number of volatility days and the volatility will change accordingly. Thanks so much Peter for a job well done.

Your spreadsheet has helped me track volatility with ease. This website describes the formula in depth and with details links. I am an engineer and was studying pricing movement. I used and applied the online formula found on googling historical volatility formula.

### Most Volatile Options

I was trying to compare my result with yours. I like your chart.

I tried other place like Ivolatility. Thanks a bunch for sharing your spreadsheet - you saved me many hours of work and your version is better taht the one I had intended to create!

I have a macbook and vb macros don't work on mac office. Is there any other alternative? An online version or something? Hi Aydin, try this: Hi Michael, That's a good question and to be honest I've never thought about it before ;-. All the stats books I've looked at always used STDEV only What are your thoughts? Do you think STDEVP is a better alternative?

I really appreciate this I just have one question: Why do you use sample standard deviation when computing volatility as opposed to standard deviation of the population excel function: Hi Ben, I plan to release the source code in the future, however, for the time being it is locked. You can check out a similar example from: Calculating Historical Volatility Volatility is the most crucial of all option trading concepts. Implied Volatility Implied volatility is the markets view of where volatility will be in the future.

But for now, take a look at the following illustration; Historical Volatility tells us how volatile as asset has been in the past. The Volcone Analyzer Another way to look at implied volatility is to compare the current level of implied volatility to the average level of implied volatility for the same option.

Options What are Options? Where are Options Traded? Option Types Option Style Option Value Volatility Time Decay In-The-Money? Payoff Diagrams Put Call Parity Weekly Options Delta Hedging Options Asset Types Index Option Volatility Option Currency Options Stock Options.

Comments 38 Peter June 19th, at 1: Lakru June 18th, at 4: Peter June 1st, at 7: Philip June 1st, at 2: John May 31st, at 6: Peter July 29th, at 6: Luis July 29th, at Thanks SAIFEE June 25th, at 3: Mike February 1st, at 1: Peter January 14th, at Kyle January 12th, at 6: Peter January 11th, at 6: Milos January 11th, at 3: I have seen that in other places day rolling window is used, that is why I am asking Artun January 5th, at Dave November 7th, at Dave Peter November 5th, at 2: Dave November 5th, at Alan Chua October 19th, at 4: Peter October 13th, at 7: Great spreadsheet Happy Trading!

#### Volatility Trading - Using Excel to Calculate Stock Volatility

Seibel September 25th, at Peter September 14th, at 6: You could check out www. Hazem September 13th, at Aydin August 27th, at 4: Peter July 10th, at 7: Aydin July 2nd, at 5: Can I please get the VBA password: Peter June 6th, at 5: Michael June 5th, at 9: Joey January 17th, at 6: Thanks a lot for your work. Add a Comment Name.

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