Chester Keltner, modernised by Linda Raschke
Keltner channels: a breakout system where the band width is the signal
Bollinger Bands and Keltner channels look almost identical on a chart and disagree about something fundamental: what a band should measure. Keltner's bands are built from average true range, which changes what they do around gaps, during volatility spikes, and in the quiet stretch before a move — and it is the reason traders who use both watch for the moment one sits inside the other.
- Style
- Breakout
- Approach
- Mechanical
- Difficulty
- Intermediate
- Horizon
- Swing (days to weeks)
- Holding period
- Days to weeks
- Time needed
- 20 minutes a day
- Markets
- Futures · FX · Single stocks
- Source
- How to Make Profits in Commodities (Keltner, 1960); modernised in Linda Raschke's ATR-band variants — Chester Keltner, modernised by Linda Raschke
The rule set
- Middle line: an exponential moving average, 20 periods being the common choice
- Bands: the EMA plus and minus a multiple of ATR — 2× ATR(10) is the standard setting
- Only take breakouts that agree with the slope of the middle line; a close above the upper band while the EMA is falling is not a signal
- Stop at the middle line, or at a fixed ATR multiple from entry, whichever you have tested
- Exit when price closes back inside the channel
What makes it distinctive
- Band width comes from average true range, which absorbs gaps and volatility spikes more gracefully than a standard deviation does
- The middle line is an EMA, so the system carries its own trend filter rather than needing a second indicator bolted on
- Paired with Bollinger Bands it identifies the squeeze — the compression that often precedes a directional move
When it works
Trending markets where volatility is expanding steadily — the band widens with the move, which keeps the stop at a sensible distance instead of a fixed one that becomes too tight.
When it fails
Low-volatility ranges tag both bands repeatedly and signal quality collapses entirely. When ATR spikes, the stop is pushed a long way from entry and per-trade risk gets away from you unless the position size is recalculated at the same time.
How a decision moves through it
Input
Daily OHLC
True range needs the previous close as well as today's high and low, which is what lets it count a gap as movement rather than ignoring it.
Measure
EMA(20) — the middle line
Doubles as the trend filter. Its slope, not its position, is what the entry rule consults.
Measure
ATR(10), scaled by a multiplier
Sets the half-width of the channel. Two is conventional; the number decides how much of an ordinary move counts as a breakout.
Decide
Close beyond the band, in the direction of the slope
Both halves are load-bearing. The band alone fires constantly in a range; the slope alone is a lagging trend signal with no trigger.
Size & protect
Stop at the middle line or a fixed ATR multiple
The middle-line stop moves with the trend and tightens as the channel narrows. The fixed stop is easier to size against.
Act
Exit on a close back inside the channel
Symmetric with the entry: the same evidence that got you in, reversed, gets you out.
The disagreement between Keltner and Bollinger
Both indicators draw a middle line with a band on either side. The difference is what sets the distance. Bollinger uses standard deviation of closing prices; Keltner uses average true range. On a calm chart the two look nearly identical, which is why the distinction is usually skipped.
Standard deviation measures how much closes have varied. True range measures how far price actually travelled, including the gap from yesterday's close. Those are different questions, and they diverge exactly when it matters.
A market that gaps 4% and then trades quietly all day has produced almost no closing variance and a very large true range. Bollinger Bands barely notice; Keltner channels widen. If your stop is derived from the band, this is the difference between a stop placed for yesterday's conditions and one placed for today's.
Two indicators share this name
Chester Keltner's original, published in 1960, used a 10-day simple moving average of the typical price — high, low and close averaged — with bands set from the average daily range. What every charting platform now labels a Keltner channel is Linda Raschke's later version: an exponential moving average with bands at a multiple of ATR.
Why traders run it alongside Bollinger Bands
Because the two bands measure different things, their relative position carries information. When Bollinger Bands contract inside the Keltner channel, closing variance has fallen faster than true range — the market has gone quiet in a specific way that has historically preceded expansion.
This is the most-used application of Keltner channels and it is a setup rather than a system: it tells you when to pay attention, not what to do. The breakout rules on the next page are what convert it into a decision.
Five ways into this system
- The Keltner breakout rules: why the slope filter is not optionalA band touch is not a signal. What makes this system work is the condition attached to it, and most published versions leave that condition out.7 min read
- Sizing against a stop that moves: the problem ATR bands createThe band that makes this system adaptive also makes the stop distance a moving target. Sizing has to account for that, or per-trade risk quietly triples in exactly the conditions that produce the largest losses.6 min read
- What Keltner channels need from a market: volatility that expands, not just volatilityThe system does not need a volatile market. It needs one where volatility expands as price moves — and those are not the same condition.6 min read
- The quiet range and the volatility spike: two opposite ways this system breaksThis system fails in two opposite conditions, and the mitigation for one makes the other worse. Knowing which you are in is most of the skill.6 min read
- Keltner channels explained for beginners: what the two lines are actually measuringNo prior knowledge assumed. What a moving average is, what ATR measures, and why the most common way of reading these bands is backwards.7 min read
The ideas behind it
This system assumes you already know these. Each one is explained from scratch in Investing 101.
Compare with
These are documented methods described for study. Nothing here is investment advice, a recommendation, or a claim about future returns — every system on this page has losing periods, and the pages say where.
Reading about a system is not having one.
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