Keltner Channels: Indicator Guide
Keltner Channels draw a band above and below an exponential moving average (EMA), which is a moving average that gives recent days more weight. The width of the band comes from Average True Range (ATR), how far a stock typically moves in one day, so the channel widens when daily swings grow and narrows when they shrink. It frames a normal range around the recent trend, and nothing in it forecasts the next move.
What It Shows
The channel marks out what counts as a normal price range around the recent trend. The middle line is a 20-day exponential moving average (EMA). The upper and lower lines sit a set distance away, and that distance is a multiple of ATR. Most of the time price stays inside the channel, so a close outside it stands out.
The channel looks a lot like Bollinger Bands, and the two often share a chart. The difference is the width math. Bollinger Bands use standard deviation, which jumps when one big day arrives. Keltner Channels use ATR, which tends to move more smoothly.
How It's Calculated
Start with the EMA of closing prices over 20 days. Then take the 10-day Average True Range and multiply it by 2. Add that amount to the EMA for the upper line and subtract it for the lower line.
Made-up prices make this concrete. If the EMA is $100 and the ATR is $2, the upper line is 100 + (2 × 2) = $104 and the lower line is 100 − (2 × 2) = $96. If the ATR grows to $3, the lines move to $106 and $94 even though the EMA has not moved.
How to Read It
Read the channel three ways. Each describes what price has done, not what it will do.
- A close outside the channel. A close above the upper line or below the lower line is an unusually large move for that stock. It marks a stretched price, not a certain reversal.
- Hugging an edge. Price that keeps hugging the upper line shows steady momentum. In a strong trend, price can ride one edge for a long time.
- A squeeze. When the Bollinger Bands pull inside the Keltner Channels, traders call it a squeeze: volatility is unusually low, and the stock has gone quiet without saying which way it will move.
Where It Misleads
An outside close is not an automatic reversal, because trends can run along the edge.
Because the middle line is a moving average, the channel follows price instead of leading it. It describes what the stock has just done.
Settings in Rapunzl
| Setting | Default | Range |
|---|---|---|
| EMA Period | 20 | 2 to 400 |
| ATR Period | 10 | 1 to 400 |
| Multiplier | 2.0 | 0.5 to 10.0 |
EMA Period sets the middle line. A shorter EMA hugs price, while a longer one is smoother and slower to turn. ATR Period is how many days of ATR set the width, and a shorter period lets the channel react quickly to new volatility. Multiplier is how many ATRs away the outer lines sit: higher means a wider channel and fewer closes outside it, lower means a tighter channel and more. Both periods count candles, so whatever length of candle the chart uses, a 10 means ten of them.
Try It in Rapunzl
Keltner Channels need each day's high and low, so choose Candlestick or OHLC on a stock's chart before anything else. Then open Customize Chart → Chart Indicators → Advanced Indicators and add Keltner Channels. Next, change the Multiplier from 2.0 to 1 and then to 3 and watch the lines move in and out. Keltner Channels are a Premium study on the chart.
Rapunzl's Stock Scanner has a built-in idea called "Breaking out of the bands", which lists company stocks above their upper Bollinger Band on at least 1.5 times their usual volume. Any stock on it is a stock to study, not a pick. Open a result's chart and add Keltner Channels to see whether the stock also sits outside the Keltner lines. The Stock Scanner is free.
A 15-Minute Class Activity
Draw the Channel. Students work in pairs with graph paper or plain paper and a ruler. All prices below are made up.
- 3 minutes. Tell the class a made-up stock has a 20-day EMA of $100 and an ATR of $2. Explain that the channel sits a multiple of the ATR above and below the EMA.
- 5 minutes. Pairs work out the upper and lower lines for multipliers of 1, 2 and 3 and draw all three channels on one sheet. The answers are $102 and $98, $104 and $96, and $106 and $94.
- 4 minutes. Announce that today's close is $105. Pairs mark which channels it sits outside. It is outside the first two and inside the third.
- 3 minutes. Exit ticket: in one sentence, explain why the multiplier changes how often a stock looks stretched.
Related Indicators
- Bollinger Bands: the other volatility envelope, with width from standard deviation.
- Average True Range: the measure that sets the channel's width.
- Moving averages: the idea behind the middle line.
Frequently Asked
Questions
They are an upper and a lower line drawn around a 20-day EMA. The lines sit a multiple of ATR away from the EMA, so the channel adjusts to how much the stock has been swinging.
Both draw a channel, but Bollinger Bands set the width with standard deviation and Keltner Channels use ATR. The same price can sit outside one and inside the other.
No. It marks an unusually large or stretched move, and trends can run along the edge of the channel for a long time.
An EMA period of 20, an ATR period of 10 and a multiplier of 2.0.
The chart study is part of Rapunzl Premium. Rapunzl's Stock Scanner is free.
Teach Volatility Bands With Rapunzl
A band around the price is a friendly first picture of volatility for students. Request a demo to see Rapunzl in a class like yours, and point families to the parents page for home exploration.
Indicators, patterns and examples in this article are for education and are not investment advice or a recommendation to buy or sell any security.
By Clarissa Collins, Curriculum Designer at Rapunzl.