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.

Calculation

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.

Related Indicators

Bollinger Bands

Bollinger Band %b

Custom Dates

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Symbol Id Name Exchange Close Price Trade Date
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AAPLAPPLE INC.1/18/2017Nasdaq GS119.99001/18/2017NGSM
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