How to Use the ATR
To use the average true range, read it as a measure of how far this instrument normally moves in one bar. Place your stop outside that ordinary movement, then let the stop distance set your position size. It says nothing whatever about direction.
The average true range answers one question: how far does this instrument normally move in a bar. Its usefulness comes entirely from the fact that it refuses to answer any other.
Before you start
The indicator’s period set deliberately rather than left at 14. A shorter period reacts to recent conditions; a longer one describes a broader normal. Choose, and be able to say why.
Your round-trip cost, to compare against it. The comparison between what a move costs and how far the instrument travels is the most useful thing this indicator enables.
A stop distance expressed as a multiple you chose in advance. Two average ranges, three, whatever you decide — chosen before the trade, not fitted to it.
The steps
1. Read it as distance, never as direction
A high reading means large bars, up or down. It contains no information about which way the next one goes and was never designed to.
2. Understand why true range includes the gap
True range measures from the previous close, not just from the bar’s own low. That is what makes it honest about overnight moves that a simple high-minus-low would miss.
3. Place the stop outside ordinary movement
Your chosen multiple, measured from the entry. A stop inside one average range will be reached by nothing in particular, which is a loss with no information in it.
4. Let the distance set the size
Divide what you will risk by the distance. In a volatile period this produces a smaller position automatically, which is the mechanism doing its job.
5. Compare an instrument only against itself
The reading is in the instrument’s own units, so comparing across markets is meaningless. Compare today’s reading to its own history instead.
6. Accept that it says nothing about direction
No threshold on this indicator is a buy or a sell. Every attempt to make it one is asking a ruler to tell you where north is.
7. Remember it ignores participation
Large bars on very thin volume produce the same reading as large bars on heavy volume, and the two situations are not the same.
8. Set your cost against it
A round trip on the shared series is 2% of a median bar’s range. Expressing your cost as a fraction of the average range is the clearest measure of whether a timeframe is affordable.
How to tell it worked
Audit your last 30 trades, over at least 60 days.
Measure each stop distance in average ranges. Anything under 1 is inside the noise and anything over 5 is a stop chosen for comfort. The distribution across 30 trades tells you whether the multiple you chose is actually the multiple you used.
Count how many stops were hit by a move smaller than one average range. Every one of those is a stop that was too tight for the conditions rather than a bad entry.
Then express your round-trip cost as a percentage of the current reading. If the cost is a large fraction of what the instrument moves in a bar, the timeframe is too fast for your cost base — and no entry improvement fixes an arithmetic problem.
Why one fixed stop distance cannot work
Volatility varies enormously within a single series. On the shared price history the ATR-14 has a median of 0.5994, a tenth percentile of 0.2823 and a ninetieth of 0.7954 — a 2.82-fold spread between the quiet and busy ends.
Raw bar ranges vary more still. Median 0.493, tenth percentile 0.17, ninetieth 1.101 — a 6.5-fold spread, with the smallest bar at 0.022 and the largest at 2.338.
So a stop of a fixed number of points is enormous in one regime and invisible in another. A
multiple of the average range adjusts automatically, which is the entire argument for using this
indicator at all. The figures are in research/series-measurements.json.
The original data
Of the 24,971 unique videos in research/search-study-corpus.jsonl, 135 have an instruction-shaped
title mentioning the ATR, at a median of 11,637 views across 105 channels, with a maximum of
2,019,015. Position sizing, the step this feeds, appears in only 34 at a median of 6,157. The counts
come from site/rank_howto.py.
135 videos on the indicator against 34 on the arithmetic it exists to serve. Four times the coverage for the measuring tool and a quarter of it for the decision the measurement is taken for, which is the same imbalance that runs through this corpus: the visible thing gets the attention and the arithmetic underneath it does not.
The answer to the question on that chart is yes for a new position and no for an open one. On a trade you have not entered, a doubled reading means the same multiple produces a wider stop and therefore a smaller size, which is correct. On a position already open, widening the stop increases a risk you already agreed to — that is not the indicator adapting, it is the plan being abandoned.
When it fails
It is a backward-looking average, so it is smallest exactly before volatility arrives. A long quiet stretch drives the reading down, stops sized from it get tight, and then the move that ends the quiet period blows through all of them at once. The indicator was accurate about the past the entire time — it simply has no mechanism for anticipating a change, and the periods when it is most reassuring are the periods when it is least informative.
The second failure is asking it for direction. It contains none.
A third is comparing readings across instruments. They are in different units.
A fourth is a stop inside one average range. Ordinary movement will reach it.
A fifth is widening a stop on an open position. That is increasing accepted risk mid-trade.
And a sixth is ignoring participation. Thin markets produce large ranges that mean something different.
Related
ATR covers the calculation and why true range includes the gap. Stop loss is where the distance from step three is used. And position sizing is the arithmetic that distance feeds, and the reason to measure any of this.
The reason I keep this one on the chart when almost everything else has come off is that it answers a question I actually have. Not which way, and not when — just how far this thing typically travels, so a stop can sit outside that. It is the only indicator I use whose output feeds directly into an arithmetic step rather than into a judgement.
— Michael Whitman
This page is educational, not financial advice. Test every idea on your own charts before risking money.