Bollinger Bands: Reading Market Volatility

Bollinger Bands are one of the most popular technical indicators in forex trading. Created by John Bollinger, they measure market volatility and help identify potential overbought and oversold conditions.

How Bollinger Bands Work

Bollinger Bands consist of three lines:

1. Middle Band: A 20-period Simple Moving Average (SMA).
2. Upper Band: Middle Band + (2 × Standard Deviation).
3. Lower Band: Middle Band - (2 × Standard Deviation).

The bands expand and contract based on market volatility:

• Wide Bands: High volatility (big price swings).
• Narrow Bands: Low volatility (price is consolidating).

Key Trading Strategies

1. The Bounce (Mean Reversion)

Price tends to return to the middle band (the "mean"). When price touches the outer bands, it often reverses.

• Buy Signal: Price touches or pierces the lower band, then closes back inside.
• Sell Signal: Price touches or pierces the upper band, then closes back inside.
• Target: The middle band (20 SMA).

2. The Squeeze (Breakout Setup)

When the bands narrow significantly (a "squeeze"), it signals a period of low volatility that typically precedes a powerful breakout.

• The bands compress → volatility decreases → energy builds.
• When the bands start expanding, enter in the direction of the breakout.
• The longer the squeeze, the more powerful the resulting breakout.

3. Walking the Bands (Trend Following)

In strong trends, price can "walk" along the upper or lower band for extended periods.

• Strong Uptrend: Price hugs the upper band. Don't sell just because price is at the top.
• Strong Downtrend: Price hugs the lower band. Don't buy just because price is at the bottom.

In these cases, use the middle band as a trailing stop instead.

Bollinger Bands Settings

Combining with Other Indicators

Bollinger Bands work best when combined with:

• RSI: Confirm overbought/oversold at the bands.
• MACD: Confirm momentum direction.
• Volume: Validate breakouts from squeezes.

Common Mistakes

1. Trading every band touch. In strong trends, price can stay at the bands for days.
2. Ignoring the squeeze. The squeeze is the most powerful signal — don't miss it.
3. Using default settings on all timeframes. Adjust the period for shorter timeframes.

Bollinger Bands are versatile — they work for range trading, breakout trading, and trend following. Master the squeeze, and you'll have a significant edge.