What is Historical volatility calculator?

Stock volatility is just a numerical indication of how variable the price of a specific stock is. However, stock volatility is often misunderstood. Some think it refers to risk involved in owning a particular company's stock. Some assume it refers to the uncertainty inherent in owning a stock. Neither is the case. For investors it represents an important measure of how desirable it is to own a certain stock, based on the investor's appetite for risk and reward. Here's how to calculate stock volatility.

This is illustrated by the following equation

The formula for computing the Historical Volatility (HV), is:

$$ s = \sqrt { \frac {1}{n-1} \sum_{i=1}^n {(x_i - m)^2} }$$


s = standard deviation

n = number of continuous returns (not number of days)

xi = continuous returns

m = mean price change

Optional: Scale as necessary

We need third party historical data from google or yahoo or any other site,also we are using google line graph.

To scale the historical volatility, multiply the HV by the square root of the scale factor.

$$ Daily \space HV = {HV} * {\sqrt {1 \space \space trading \space day}} $$ $$ Weekly \space HV = {HV} * {\sqrt {1week \space trading \space days}} $$ $$ Monthly \space HV = {HV} * {\sqrt {1month \space trading \space days}} $$
Symbol = stock symbol.
Start date = Start date.
End date = End date.
Period = Daily,Weekly,Monthly.

Start date:
End date:
Period: Daily     Weekly     Monthly    


The information received by subscribers is for their personal use. Investing involves a great deal of risk, including the loss of all or a portion of your investment, as well as emotional distress. Nothing contained herein should be construed as a warranty of investment results. All risks, losses and costs associated with investing, including total loss of principal, are your responsibility. It is possible that Investment Models, Inc., may have a position in stocks or funds discussed within this site or in correspondence sent to clients.

All information provided or contained in this Web site is the property of BioCrude Technologies, Inc., and should not be reproduced, copied, redistributed, transferred, or sold without the prior written consent of BioCrude Technologies, Inc. All rights reserved.