Bollinger Bands Strategy: How to Trade Squeezes, Bounces and Breakouts
Bollinger Bands are one of the most popular indicators in forex because they show two things at once: the average price and how volatile the market is. When you understand how the bands expand and contract, you can recognise quiet periods before big moves, spot overextended prices, and stay with strong trends. This guide explains how the indicator works and how to use it in three common ways.
How Bollinger Bands are built
The indicator, developed by John Bollinger, has three lines:
- Middle band – a simple moving average, by default over 20 periods.
- Upper band – the middle band plus 2 standard deviations of price.
- Lower band – the middle band minus 2 standard deviations.
Standard deviation measures how spread out prices are. When price moves a lot, the bands widen. When price is quiet, they narrow. With the default settings, most closing prices fall inside the bands, so moves outside them are relatively unusual.
What the bands tell you
- Narrow bands show low volatility. Quiet periods often come before large moves.
- Wide bands show high volatility, often during or after a strong move.
- Price near the upper band shows strength, not necessarily an overbought market.
- Price near the lower band shows weakness, not necessarily an oversold market.
- The slope of the middle band helps show trend direction.
A common mistake is to sell every touch of the upper band. In a strong uptrend, price can “walk the band” for a long time.
Strategy 1: the Bollinger squeeze
A squeeze happens when the bands become unusually narrow. Volatility tends to cycle, so a squeeze often leads to an expansion and a strong move. The challenge is that the squeeze does not tell you the direction.
- Find a squeeze: the bands are the narrowest they have been for a while, often over the last 50 to 100 candles.
- Mark the range high and low during the squeeze.
- Wait for a candle to close outside the range and outside a band, ideally with a strong body.
- Enter in the direction of the breakout, or wait for a retest of the broken range.
- Place the stop on the other side of the range, or at the middle band.
- Take profit at the next key level, or trail the stop along the middle band.
Squeezes often break around session opens or news releases. Check the economic calendar and be ready for fake breakouts. Our breakout strategy guide covers how to filter them.
Strategy 2: mean reversion bounces in a range
When the market is ranging and the middle band is flat, price often moves from one band to the other.
- Confirm a range: a flat middle band and clear horizontal support and resistance.
- Wait for price to reach the outer band at the edge of the range.
- Look for rejection, such as a pin bar or engulfing candle. See candlestick patterns.
- Enter towards the middle band.
- Target the middle band first, and possibly the opposite band.
- Place the stop beyond the rejection wick.
Combining this with an oscillator such as the RSI can help. A touch of the lower band with RSI showing bullish divergence is a stronger signal than either on its own. Avoid this strategy when the bands are widening sharply, which often signals the start of a trend.
Strategy 3: riding the bands in a trend
In a strong trend, the middle band often acts as dynamic support (in an uptrend) or resistance (in a downtrend).
- Confirm the trend: the middle band slopes clearly and price stays mostly between the middle and outer band.
- Wait for a pullback to the middle band.
- Enter when price rejects the middle band and resumes in the trend direction.
- Place the stop beyond the recent swing, or a little beyond the opposite band.
- Trail the stop as the trend continues, or exit when price closes firmly on the other side of the middle band.
Settings
The default 20-period, 2-standard-deviation setting works well for most traders and timeframes. Some short-term traders use 10 periods with 1.5 deviations, and some longer-term traders use 50 periods with 2.5 deviations. Changing settings changes how often signals appear, not whether they work. Test any change on past charts before using it with real money.
Risk management with Bollinger Bands
Band width gives a quick sense of current volatility. When the bands are wide, stops usually need to be wider, which means a smaller position size to keep your risk the same. Always calculate the lot size from your stop distance using the lot size calculator, and check the trade with the risk reward calculator.
Common mistakes
- Treating every band touch as a reversal signal. In trends, touches show strength.
- Guessing the squeeze direction. Wait for the breakout candle to close.
- Using the bands alone. Combine them with support and resistance, trend and price action.
- Ignoring higher timeframes. A lower-band bounce on the 15-minute chart is weaker if the daily trend is strongly down.
Frequently asked questions
Do Bollinger Bands work on all pairs?
The indicator adapts to each pair's volatility, so it can be used on any pair and timeframe. Results still vary, so test your chosen strategy on the pairs you actually trade.
What is the best indicator to combine with Bollinger Bands?
Many traders pair them with a momentum indicator such as RSI or MACD to confirm strength or divergence, and with horizontal support and resistance for context.
Is a close outside the bands a buy or sell signal?
Not by itself. A close outside the upper band can mean a strong breakout or an overextended move. The surrounding context, trend and price action decide which is more likely.
Key takeaways
- Bollinger Bands show the average price and current volatility.
- Narrow bands (a squeeze) often come before a large move.
- In ranges, price tends to move between the bands. In trends, it can ride one band.
- Use the bands with price action and sound risk management, not as standalone signals.