Bollinger Band Width %
Bollinger Bands show the volatility of a stock based on Standard Deviation around a Simple Moving Average. The related Width % indicator shows the width of the bands as a percentage of the SMA.
Bollinger Bands have 3 lines. The middle line is just the Simple Moving Average.
The Upper is calculated as SMA + (Standard Deviation * Number of Deviations).
The Lower is calculated as SMA - (Standard Deviation * Number of Deviations).
Width % is calculated as ((Upper - Lower) / Middle) * 100.
The default Period for the SMA and SD is 20 and the default Number of Deviations is 2.
Bollinger Band %b