# Historical Volatility - HV

## What is 'Historical Volatility - HV'

Historical volatility (HV) is the realized volatility of a financial instrument over a given time period. Generally, this measure is calculated by determining the average deviation from the average price of a financial instrument in the given time period. Standard deviation is the most common but not the only way to calculate historical volatility.

Also known as "statistical volatility."

## BREAKING DOWN 'Historical Volatility - HV'

This measure is frequently compared with implied volatility to determine if options prices are over- or undervalued. Historical volatility is also used in all types of risk valuations. Stocks with a high historical volatility usually require a higher risk tolerance.