Intermediate3 min readLast updated: 2026-06-10
Bollinger Bands Trading — Complete Guide
Master Bollinger Bands for trading: band squeeze breakouts, mean reversion, walking the bands, and combining Bollinger Bands with other indicators.
What Are Bollinger Bands?
Bollinger Bands are a volatility indicator consisting of three lines: a middle band (SMA) and two outer bands that expand and contract based on price volatility. Created by John Bollinger, they adapt to market conditions automatically.
Components
| Component | Calculation | Purpose |
|---|---|---|
| Middle Band | 20-period SMA | Trend direction and mean |
| Upper Band | SMA + (2 × Standard Deviation) | Overbought/resistance area |
| Lower Band | SMA - (2 × Standard Deviation) | Oversold/support area |
| Band Width | (Upper - Lower) ÷ Middle | Volatility measurement |
Key Properties:
- ~95% of price action stays within the bands (2 SD)
- Bands expand during high volatility
- Bands contract during low volatility (squeeze)
- Price touching bands is NOT automatically a signal
Trading Strategies
Strategy 1: Bollinger Band Squeeze (Breakout)
When bands squeeze tight (low volatility), a big move is coming:
Setup:
1. Identify BB squeeze (narrowest bands in 50+ periods)
2. Wait for price to break above upper band OR below lower band
3. Confirm with volume increase
4. Enter in breakout direction
Entry: Close above upper band (long) or below lower band (short)
Stop: Middle band (SMA 20)
Target: 1.5-2× the band width
Strategy 2: Mean Reversion (Band Bounce)
In RANGING markets:
- Price touches upper band → potential sell (mean reversion to middle)
- Price touches lower band → potential buy (mean reversion to middle)
- Target: Middle band (20 SMA)
- Stop: Beyond the band
WARNING: Don't use in trending markets (price can "walk the bands")
Strategy 3: Walking the Bands (Trend)
In strong trends, price consistently touches/exceeds one band:
- Strong uptrend: Price walks along upper band (don't sell!)
- Strong downtrend: Price walks along lower band (don't buy!)
- Trade pullbacks to middle band in trend direction
Strategy 4: Double Bollinger Bands
Use two sets: Standard (2 SD) + Inner (1 SD):
- Price between upper 1SD and 2SD = Strong bullish trend
- Price between lower 1SD and 2SD = Strong bearish trend
- Price between +1SD and -1SD = Neutral/ranging
- Crossing from neutral to trend zone = entry signal
BB + RSI Combination
| BB Signal | RSI Confirmation | Action |
|---|---|---|
| Touch upper band | RSI > 70 + divergence | Sell signal |
| Touch lower band | RSI < 30 + divergence | Buy signal |
| Squeeze breakout up | RSI crossing above 50 | Confirmed long |
| Squeeze breakout down | RSI crossing below 50 | Confirmed short |
| Walking upper band | RSI 60-80 range | Stay long, trend is strong |
Common Mistakes
| Mistake | Reality |
|---|---|
| Selling every upper band touch | In trends, price walks the band |
| Buying every lower band touch | In downtrends, price stays at lower band |
| Ignoring squeeze context | Squeeze direction depends on prior trend |
| Using wrong settings | Default 20,2 works for most cases |
| Trading BB alone | Always combine with trend/momentum |
Related Topics
- Volatility Analysis — Volatility context
- Technical Indicators — Combine with BB
- Support & Resistance — BB as dynamic S/R
- Chart Patterns — Patterns within BB
- Trading Plan — BB rules in your plan