Bollinger Bands
VolatilityOverlays priceA band drawn above and below an average by the usual size of its swings.
What it looks like
Drawn by running the real calculation over one sample series. Open a symbol and it is recalculated on that symbol's bars.
How to read it
The middle is a moving average and the outer lines sit a number of standard deviations away — that is, a measure of how spread out prices usually are. A narrow band means a quiet stretch, a wide one a volatile stretch.
Where it misleads
Touching a band is not itself a signal — in a strong run price rides the upper line for a long time.
Default settings
You can change these on the chart. These are the values it starts with.
In SQMATE
One tap to add
Open a symbol, tap the name in the indicator list and it is drawn straight away. You can stack several copies of the same indicator with different settings.
Recalculated per timeframe
Switch between minute, hourly, daily, weekly or monthly bars and it is recalculated on that timeframe. The maths runs over every bar loaded, so zooming never moves the line.
Use it as a search condition
Some indicators can also be used as an axis when searching for symbols — for example, keeping only symbols above a given reading, scanned every night.
Related indicators
- EnvelopeA band drawn a fixed percentage above and below a moving average.
- Keltner ChannelsA band set above and below an average by the average bar range (ATR).
- ATR BandsA band set a multiple of average range away from a moving average.
- Standard Error BandsA band around the best-fit straight line, sized by the fit's error.
- ATRHow much a single bar typically moves.
- Bollinger BandWidthThe width of the Bollinger band pulled out as its own line.
Every indicator is an observation computed from past bars. It does not tell you future prices and it is not investment advice.