From Interactive Brokers

Percent B Indicator

Trading Term

%B quantifies a security’s price relative to the upper and lower Bollinger Bands. There are six basic relationship levels:

%B equals one when the price is at the upper band.
%B equals zero when the price is at the lower band.
%B is greater than one when the price is above the upper band.
%B is less than zero when the price is below the lower band.
%B is greater than .50 when the price is above the middle band (20-day SMA).
%B is less than .50 when the price is below the middle band (20-day SMA).

The default setting for %B is based on the default setting for Bollinger Bands (20,2). The bands are set two standard deviations above and below the 20-day simple moving average, which is also the middle band. The security price used is the closing price or the last trade.

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