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VolatilityPine Script v6

ta.bb()Bollinger Bands

Bollinger Bands. A Bollinger Band is a technical analysis tool defined by a set of lines plotted two standard deviations (positively and negatively) away from a simple moving average (SMA) of the security's price.

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Syntax

Syntax
ta.bb(series, length, mult) → [series float, series float, series float]

Arguments

ParameterTypeDescription
seriesseries int/floatSource series (typically price).
lengthseries intLength of the moving average and standard deviation window.
multsimple int/floatStandard deviation factor.

Returns

Bollinger Bands.

Remarks

na values in the source series are ignored; the function calculates on the length quantity of non-na values.

Code Examples

Pine Script v6 Example
//@version=6
indicator("ta.bb")

[middle, upper, lower] = ta.bb(close, 5, 4)
plot(middle, color=color.yellow)
plot(upper, color=color.yellow)
plot(lower, color=color.yellow)

// the same on pine
f_bb(src, length, mult) =>
    float basis = ta.sma(src, length)
    float dev = mult * ta.stdev(src, length)
    [basis, basis + dev, basis - dev]

[pineMiddle, pineUpper, pineLower] = f_bb(close, 5, 4)

plot(pineMiddle)
plot(pineUpper)
plot(pineLower)

Trading Applications

Identify overbought/oversold conditions when price touches bands

Detect volatility squeezes for breakout trading

Use band width for volatility measurement

Combine with RSI for confluence signals

Related Functions

ta.smata.stdevta.kc

Frequently Asked Questions

ta.bb() returns three series: the middle band (SMA of the source), upper band (middle + mult × standard deviation), and lower band (middle − mult × standard deviation).

Traders often watch touches or closes outside the bands, narrowing bands (squeeze) before expansions, and mean reversion versus trend continuation setups. Bands are not guaranteed oversold/overbought signals; context and risk management matter.

mult scales the distance of the upper and lower bands from the middle band in units of standard deviation. Higher mult widens the channels; lower mult tightens them.

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