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Bollinger Bands

Bollinger Bands wrap a moving average in two volatility-based bands that widen when markets are turbulent and narrow when they're calm.

In one line: Bollinger Bands wrap a moving average in two volatility-based bands that widen when markets are turbulent and narrow when they're calm.

What it is

Bollinger Bands, created by John Bollinger, plot three lines: a middle band (usually a 20-period simple moving average) and an upper and lower band set a number of standard deviations (typically two) above and below it. Because standard deviation measures volatility, the bands automatically widen in wild markets and contract in quiet ones.

How it works

Two signals dominate:

  • The squeeze: when the bands pinch tight, volatility has collapsed — energy coiling before a potentially large move. The squeeze doesn't say which direction, only that a move may be near.
  • Band tags: price riding the upper band signals strength (not automatically 'overbought'); tagging the lower band signals weakness.
Common mistake: touching the upper band is not a sell signal. In a strong trend, price can 'walk the band' for a long time. Bands describe volatility — they aren't automatic triggers.

Worked example

Example

A large-cap trades quietly and its Bollinger Bands narrow to their tightest in months — a classic squeeze. Then price closes above the upper band on rising volume and the bands begin to expand — a volatility expansion favoring a breakout higher. A trader takes the long with a stop back inside the range, knowing the squeeze only signaled that a move was coming, and price plus volume picked the direction.

Why it matters

Bollinger Bands make volatility visible, which most price tools ignore. The squeeze is a genuinely useful heads-up that a quiet market is about to get interesting, and band position adds context to trend strength. Used well they're a volatility lens; used naively (fading every band tag) they lose money in trends.

Entry Point Trading factors volatility context into its daily read so signals are framed against how much a name is actually moving — then graded in the open.

Keep learning

Related concepts

Moving Averages
Smoothing price to see the trend beneath the noise.
Volatility and the VIX
Measuring fear and expected market swings.
MACD
A trend-and-momentum indicator built from moving averages.
Breakout Trading
Trading a move through a defined level on rising participation.
Volume Analysis
Using trading volume to confirm or doubt a price move.
RSI (Relative Strength Index)
A momentum oscillator for overbought/oversold reads.

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Common questions

FAQ

Does price touching the upper band mean sell?
No — this is the most common Bollinger Band mistake. In a strong uptrend, price can ride the upper band for a long stretch. A band tag signals strength as often as exhaustion. Use the bands for volatility context, combined with trend and momentum, not as an automatic reversal signal.
What is a Bollinger Band squeeze?
A squeeze is when the upper and lower bands contract close together because volatility has fallen sharply. It often precedes a significant move, since calm markets tend to give way to active ones. The squeeze flags that a move may be near — price and volume then reveal the direction.

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