# Definition Historical Volatility (HV).

Historical volatility is a measure of how much a security's price has fluctuated over a certain period of time. It is calculated by taking the standard deviation of the security's price over the specified time period.

The higher the historical volatility, the more the security's price has fluctuated over the time period. This can be seen as a measure of risk, as higher volatility generally means higher risk.

Historical volatility can be a useful tool for investors when making investment decisions. It can help them to gauge how risky an investment may be, and also to compare the risk of different investments.

What is a good volatility percentage? A good volatility percentage is one that is within the range that is considered normal for the specific investment. For stocks, a good volatility percentage is typically between 20 and 30%. For bonds, a good volatility percentage is typically between 5 and 10%.

#### Is realized volatility the same as historical volatility?

Realized volatility is the actual volatility of a security's price, as measured by the standard deviation of its returns. Historical volatility is a measure of the volatility of a security's price over a given period of time, as measured by the standard deviation of its returns.

Realized volatility is a measure of the actual volatility of a security's price, while historical volatility is a measure of the volatility of a security's price over a given period of time. Realized volatility is calculated using the standard deviation of a security's returns, while historical volatility is calculated using the standard deviation of a security's prices. What percentage of volatility is considered high? There is no definitive answer to this question as it depends on the specific asset or security being considered. However, a general rule of thumb is that a volatility level of 20% or higher is considered to be high.

##### What is IV and HV in options?

An "IV" is the implied volatility of an options contract. "HV" is the historical volatility of the underlying security.

Implied volatility is a theoretical value that measures the expected volatility of the underlying security over the life of the options contract. It is important to note that implied volatility is not the same as historical volatility.

Historical volatility is a measure of the actual volatility of the underlying security over a certain period of time. It is important to note that historical volatility is not the same as implied volatility. How does Excel calculate historical volatility? Excel calculates historical volatility by taking the natural logarithm of the price of the security at each period, and then finding the standard deviation of those logarithmic prices.