Node reference
Bollinger Bands
A moving average with upper/lower bands set a number of standard deviations away.
Rev. 2026.06
Bollinger Bandsindicator
InputsOutputsBollinger Bands
Source
source · number
Middle
middle · number
Upper
upper · number
Lower
lower · number
Configure
- period
- — Lookback length, in bars
- default 20
- range 1–500
- stdDev
- — Band width, in standard deviations
- default 2
- range 0–10
What it does
Outputs the middle (SMA), upper, and lower bands; band width expands and contracts with volatility.
What happens
Recomputed once per candle from its wired source, incrementally (constant work per bar). It emits no value until the warmup period has passed; after that it produces a value every bar.
When to use
Volatility breakouts (price piercing a band) or mean-reversion back to the middle.
Gotchas
- Multiple outputs — pick the band you mean.