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Volatility
Bollinger Band Width
BBWMeasures the width of the Bollinger Bands as a percentage of the middle band: (upper − lower) / middle × 100. Rising BBW means increasing volatility; falling BBW (a squeeze) means the market is coiling and a breakout is likely.
Tips
The Bollinger Squeeze is one of the most reliable setups: BBW at a 6-month low often precedes a large directional move
BBW alone does not predict direction—combine with a momentum indicator like MACD or RSI to bias the trade toward the breakout direction
Parameters
Period
2 - 100
Std Dev
0.5 - 4