Overlays · Indicator
Keltner Channels place bands a multiple of Average True Range above and below an EMA, giving a volatility envelope that is smoother than Bollinger Bands.
Overview
Keltner Channels draw three lines: a central exponential moving average with upper and lower bands set at a multiple of Average True Range. Breakouts beyond the bands signal strong momentum, and bounces back inside can indicate mean-reversion setups. The construction is close in spirit to Bollinger Bands but uses a different measure of volatility, which changes how the envelope behaves.
The distinction matters. Bollinger Bands use standard deviation of closing prices, which reacts sharply to a single unusual close and can widen dramatically after one outlier bar. Keltner Channels use ATR, which averages the full high-to-low range including gaps and is smoothed, so the envelope expands and contracts more gradually. The result is a steadier channel that produces fewer, more persistent band excursions.
That smoothness is why Keltner Channels are often preferred for trend work while Bollinger Bands are preferred for volatility work, and why the two are combined in the TTM Squeeze: when the sharply reacting Bollinger Bands contract inside the steadier Keltner Channels, volatility has genuinely compressed rather than merely paused.
How it is calculated
The centre line is an exponential moving average of the close over the chosen length. Average True Range is computed separately over its own length, so the band width can be tuned independently of how responsive the centre line is.
The bands are placed at a fixed multiple of that ATR above and below the centre line. Since ATR includes the gap between the previous close and the current bar, the channel widens after gaps in a way that a close-only measure would not capture.
Basis = EMA(close, Length) Upper = Basis + Multiplier * ATR(ATR length) Lower = Basis - Multiplier * ATR(ATR length)
Inputs
How to read it
The slope of the centre line gives the trend, and the bands frame how far price has stretched from it in volatility units. In a trending market price tends to spend most of its time in the half of the channel on the trend side, with the centre line acting as a pullback reference.
A close beyond a band is read differently from a Bollinger touch. Because ATR-based bands are smoother and less prone to sudden widening, price escaping the channel is a less frequent event and is usually interpreted as momentum strong enough to break out of its normal volatility range, rather than as an overbought reading.
Channel width itself describes the volatility regime. A narrow channel says recent ranges have been small, a wide one says they have been large. Comparing current width to its own recent history is more useful than comparing width across different instruments, since ATR is quoted in the instrument's own price units.
Signals to look for
A close beyond the upper or lower band after a period inside the channel is read as a momentum expansion, and is commonly used as a trend-entry trigger rather than a fade.
In a trend, a pullback into the central EMA that holds is a standard continuation reference. The band on the far side gives an objective measure of how much room the move has.
Price that pushes outside a band and then closes back within the channel is read as a failed expansion, and is one of the more common mean-reversion setups the indicator produces.
Repeated closes riding the outer band with the centre line sloping the same way describes a strong sustained trend, and is a warning against fading band contact.
Limitations
Frequently asked questions
Keltner Channels place bands a multiple of Average True Range above and below an EMA, giving a volatility envelope that is smoother than Bollinger Bands.
The slope of the centre line gives the trend, and the bands frame how far price has stretched from it in volatility units. In a trending market price tends to spend most of its time in the half of the channel on the trend side, with the centre line acting as a pullback reference.
Channel breakout: A close beyond the upper or lower band after a period inside the channel is read as a momentum expansion, and is commonly used as a trend-entry trigger rather than a fade.
In sideways markets price crosses the centre line constantly and band touches on both sides produce conflicting signals with no directional edge.
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