Bollinger BandsBOLL
布林带
Stock TechnicalP0 CoreVolatilityApplies to: US stocks
Live example
Bollinger Bands on AAPL, computed from real daily price data — switch the range to zoom.
Delayed data · For reference only · Not investment advice
Definition
MA as the middle band, standard deviation as the bandwidth.
Formula
Mid=MA(C,20), Upper/Lower=Mid±2σ
Default parameters
{
"period": 20,
"stddev": 2
}How to read it
Narrowing bands (squeeze) signal an impending move; price riding the upper band = strength.
InputscloseOutputoverlay/volatilityLibraryBBANDS
Data source: C. Public knowledge, not investment advice.
See Bollinger Bands computed live on popular US stocks →
Related indicators
Reference metadata — public, well-known indicator definitions. Not investment advice.