Bollinger Bands

Measure market volatility with a dynamic envelope around price, identifying overbought/oversold conditions and potential breakout setups.

What are Bollinger Bands?

Bollinger Bands consist of three lines: a middle band (20-period Simple Moving Average), an upper band (2 standard deviations above the middle), and a lower band (2 standard deviations below the middle). Together, they create a volatility envelope that expands and contracts with market conditions — widening during volatile periods and narrowing during consolidation.

The key insight behind Bollinger Bands is that volatility is cyclical. Periods of low volatility (narrow bands) are followed by periods of high volatility (wide bands), and vice versa. This makes BB especially powerful for identifying breakout setups: when the bands squeeze tight, a significant price move is often imminent — you just need to determine the direction.

Because the bands are based on standard deviation, roughly 95% of price action falls within them under normal conditions. When price pushes outside the bands, it signals an extreme that either continues as a momentum breakout or reverts back inside as a mean-reversion opportunity.

Key Concepts

• Middle Band: The 20-period SMA — serves as the baseline trend indicator and a mean-reversion target. In trending markets, price tends to pull back to this level before continuing
• Upper Band: 2 standard deviations above the middle — price touching or exceeding this level indicates overbought conditions or strong bullish momentum
• Lower Band: 2 standard deviations below the middle — price touching or falling below this level indicates oversold conditions or strong bearish momentum
• Bandwidth (Squeeze): When the bands narrow significantly, volatility is compressing. This “squeeze” signals that a large move is building — the tighter the squeeze, the more explosive the eventual breakout
• Band Expansion: Rapidly widening bands confirm that a breakout is underway and volatility is increasing — this validates the direction of the move

How to Use Bollinger Bands

1. Open Chart from the sidebar and navigate to the indicator settings
2. Enable the Bollinger Bands indicator
3. The default settings (20 SMA, 2 standard deviations) work well for most timeframes and assets
4. Watch the bandwidth — narrow bands signal consolidation, wide bands signal active volatility
5. Note how price interacts with the upper and lower bands for overbought/oversold conditions

What to Look For

• Bullish signals: Price bouncing off the lower band and moving back toward the middle band suggests buyers are stepping in at a discount. A Bollinger Band squeeze followed by a close above the upper band with increasing volume signals a bullish breakout. Price consistently “walking the upper band” (touching it candle after candle) shows strong bullish momentum.
• Bearish signals: Price rejecting off the upper band and dropping toward the middle band indicates sellers are capping rallies. A squeeze followed by a break below the lower band with volume confirms a bearish breakout. Price repeatedly touching the lower band shows sustained selling pressure.
• Key patterns: The BB squeeze is one of the most reliable volatility-based setups — when bandwidth reaches a multi-period low, prepare for a significant move. A “head fake” occurs when price briefly breaks one band then reverses sharply to break the opposite band — this traps traders on the wrong side. Double bottoms at the lower band or double tops at the upper band often mark reversals.
• Combine with: Volume to confirm whether band breakouts have participation behind them, VWAP to see if band touches align with the volume-weighted fair value, SMA/EMA for trend context — BB works best when you know the prevailing trend direction, OI Delta to determine if breakouts from squeezes are driven by new positions entering the market

Supported Exchanges

Tips

• The BB squeeze is most powerful on higher timeframes (4H, daily) — lower timeframes produce more squeezes but with less reliable breakouts
• Do not treat touches of the upper or lower band as automatic sell/buy signals. In strong trends, price can “walk the band” for extended periods — use additional confirmation before fading the move
• When price closes outside the bands and the next candle closes back inside, it often signals a reversal. This “Bollinger Band reversal” pattern works best in ranging markets
• The middle band (20 SMA) acts as a natural take-profit target for mean-reversion trades initiated at the outer bands