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Bollinger Bands vs Keltner Channels: how each band is built

Both draw a band above and below price. They look alike. But one band stretches with every jumpy close, and the other grows with the size of the candles.

Comparison · 6-minute read · Updated 2026-10-21

The short answer

Bollinger Bands put a line above and below a 20-bar simple average. The gap is 2 standard deviations. In plain words, the bands widen when closing prices spread out and squeeze when they bunch up.

Keltner Channels put a line above and below an average too, usually a 20-bar exponential one. The gap is a multiple of the ATR (average true range, the average size of each candle's full move).

So the difference is the ruler. Bollinger measures how scattered the closes are. Keltner measures how big the candles are.

Side by side

Bollinger Bands: strengths and limits

The good parts:

• Shows quiet spells clearly. When the bands pinch close together, price has been calm. Calm spells often end with a bigger move. The bands don't say which way.
• Quick to react. One large close and the bands open wide right away.
• Easy to find. Almost every charting app has them with the same default.

The limits:

• Jumpy. A single spike can bulge the band, then it shrinks back. That can make the band look like a signal when it's just one candle.
• "Touching the band" isn't a sell or buy. In a strong trend, price can walk along the upper band for many candles.

Keltner Channels: strengths and limits

The good parts:

• Smoother. ATR changes slowly, so the channel holds its shape.
• Good "normal range" picture. In a trend, price that stays above the middle line and pokes the top edge now and then is behaving normally.
• Handles gaps. ATR counts the jump from the last close, so gaps show up in the width.

The limits:

• Slower to warn. It can lag when a market suddenly turns wild.
• Settings differ by app. Some use a simple average, some the exponential one, some a different ATR length. Check what yours uses before comparing notes.

A simple example

Picture a stock moving about 2 points a candle for weeks. Then one candle jumps 6 points on news.

• Bollinger: that one close pulls the standard deviation up a lot. The bands open wide at once.
• Keltner: the ATR rises a little, since it's an average of many candles. The channel widens slowly.

Same chart. Two different stories about how "wild" it is right now. Neither is wrong. They measure different things. See ATR vs standard deviation.

Which fits you?

Start with the job, not the indicator.

1. Do you want to spot quiet spells before a bigger move? Bollinger Bands tend to show the pinch more clearly.
2. Do you want a steady picture of a trend's normal range? Keltner Channels tend to fit better, because they hold their shape.
3. Is your chart already busy? Pick one. Two bands on one chart mostly adds lines.

Either way, the band is a second opinion. Mark the last places price turned around first. See support and resistance. If you want a free tool that marks those turning points for you, the StructureX chart tool does it on TradingView, phone app included.

Common mistakes

• Selling every touch of the top band. In an uptrend, the top band is where strong price lives. Check the trend first. See how to identify a trend.
• Reading the squeeze as a direction. A pinch says "quiet now". It doesn't say up or down.
• Setting the stop at the band. Bands move every candle. A stop belongs past a level on the chart. Then the position size calculator sets your size from it.
• Tweaking settings after each loss. Choose one setting and test it on many past charts. See how to backtest a trading strategy.

Questions