Bollinger Bands Strategy: Trading Volatility Like a Pro

Bollinger Bands are one of the most versatile technical indicators, measuring both trend direction and volatility. Created by John Bollinger, they consist of a middle band (20 SMA) and two outer bands set at 2 standard deviations. Here’s how to trade them effectively.

Understanding Bollinger Bands

The middle band is a 20-period Simple Moving Average. Upper band = middle band + 2 standard deviations. Lower band = middle band – 2 standard deviations. Statistically, about 95% of price action occurs within the bands. When bands expand, volatility is increasing. When they contract (squeeze), volatility is decreasing — a big move is coming.

The Bollinger Band Squeeze: Predicting Big Moves

When bands contract to their narrowest width, it signals that a significant price move is imminent. This is called the “squeeze.” Look for the tightest Bollinger Band width in the last 6 months. A breakout above the upper band signals a potential uptrend. Below the lower band signals a downtrend. The squeeze doesn’t tell you direction — only that a big move is coming.

Mean Reversion: Trading the Bands

In ranging markets, price tends to oscillate between the upper and lower bands. Strategy: buy when price touches the lower band with a bullish reversal candle. Sell when price reaches the upper band. Use the middle band (20 SMA) as a profit target or re-entry point. This works in sideways markets but fails in trending ones.

Band Walk: Trading Trends

In strong trends, price “walks” along the upper band (uptrend) or lower band (downtrend). Don’t sell just because price touches the upper band — in a trend, it stays there. Instead, buy pullbacks to the middle band during an upper band walk. The trend is strong until price closes below the middle band.

Double Bottom at Lower Band

This is Bollinger’s favorite pattern: price touches the lower band, bounces, then retests the lower band area (but makes a higher low in the indicator). This double bottom combined with lower band support is a high-probability reversal signal. Works best on daily charts with above-average volume on the bounce.

Bollinger Bands + RSI: The Power Combo

Combine Bollinger Bands with RSI for stronger signals. Price at lower band + RSI showing bullish divergence = high-probability buy. Price at upper band + RSI showing bearish divergence = high-probability sell. This dual confirmation filters out many false signals.

Frequently Asked Questions

What are the best Bollinger Band settings?

The default 20,2 (20 SMA, 2 standard deviations) works for most timeframes. For intraday, some traders use 10,1.5 for more sensitivity.