What ATR multiple should I use for a stop loss?

Between one and a half and three times ATR covers most approaches. Shorter holding periods tend toward the lower end and position trades toward the higher. The multiple matters less than applying the same one consistently, because a stop distance you change after every loss stops being a rule and becomes a reaction.

What ATR period should I use?

Fourteen periods is the common default and a reasonable starting point. Shorter settings react faster to a volatility change and produce stops that move around more; longer settings are steadier but slower to widen when conditions change. Whatever you choose, keep it fixed so your results compare across trades.

Does an ATR stop stop me being stopped out?

No, and nothing does. What it changes is the reason you get stopped. A stop placed at two ATR is outside the instrument's ordinary daily range, so routine noise is less likely to reach it and a move that does reach it is more likely to mean something.

Should an ATR stop trail?

It can, and the method is the same: recalculate ATR, apply your multiple from the most favourable close, and move the stop only in the direction of the trade. A trailing ATR stop gives back more at the top than a fixed target but stays in trends longer, which suits strategies that depend on a few large winners.

Does ATR work on all timeframes?

Yes, because it is calculated from whatever bars you feed it. A fourteen period ATR on five minute bars describes intraday range and on weekly bars describes weekly range. The multiple you apply should match the timeframe you are actually trading rather than the one you happen to be looking at.

How to Set a Stop Loss Using ATR

An ATR stop places the exit at a multiple of Average True Range below the entry for a long position, or above it for a short. A common construction is two times the fourteen period ATR: if ATR is 1.80, the stop sits 3.60 away from entry. The point is that the distance is set by what the instrument actually moves rather than by a round percentage that means something different on every chart.

Once the distance is set, position size follows from it. The two decisions are the same decision, and treating them separately is where most stop placement goes wrong.

What ATR measures

Average True Range is the average of the true range over a lookback window, usually fourteen periods. True range for a bar is the largest of three distances: high minus low, high minus the previous close, and the previous close minus the low.

Those last two exist to handle gaps. A stock that closes at 50 and opens at 46 has a real range of at least four points even if it trades in a narrow band all day, and a calculation that only looked at high minus low would report a quiet session. Including the previous close catches the move that happened while the market was shut.

The output is a number in the instrument’s own units, not a percentage and not a bounded oscillator. ATR of 1.80 on a 60 stock means the typical bar covers about 1.80 points. ATR says nothing about direction. It is a measurement of range, and that is the whole of its job.

Why a percentage stop misprices risk

A flat rule such as “stop at two per cent below entry” applies the same distance to instruments whose ordinary behaviour is nothing alike.

On a stock whose ATR is roughly half a per cent of price, a two per cent stop sits four ordinary bars away. It will rarely be hit by noise, and the position can be sized generously against it.

On a stock whose ATR is three per cent of price, that same two per cent stop sits inside a single ordinary bar. It will be hit constantly, and almost never because the idea was wrong. The trader concludes they are unlucky, or that stops do not work, when the actual problem is that the stop was placed inside the instrument’s normal breathing room.

ATR fixes this by changing the unit. Instead of asking how far two per cent is, it asks how many typical bars of movement the stop sits away from entry, and that question has the same meaning on every chart.

Choosing the multiple

The multiple is where judgement enters, and it trades two things against each other.

A tighter multiple, around one and a half ATR, keeps losses small and gets you out quickly when a setup fails. It also produces a higher rate of stops hit by movement that turns out to have been meaningless, which costs both money and conviction.

A wider multiple, around three ATR, survives ordinary noise and keeps you in trades that hesitate before working. Each loss is larger, which forces a smaller position for the same account risk, and a smaller position means a smaller gain when the trade does work.

Neither is correct in isolation, because the right answer depends on what the strategy needs. Something aiming for a high win rate on short holds wants the tighter stop. Something that makes its money from a few large trends needs the room.

What matters more than the choice is not changing it after a loss. A stop multiple widened because the last trade was stopped out is no longer a rule, and the results it produces cannot be compared with anything.

Sizing from the stop distance

This is the step that makes ATR stops work, and the step most often skipped.

Decide the account risk per trade first, as a fixed fraction. Then:

Calculate the stop distance: ATR multiplied by your chosen multiple.
Divide the cash you are willing to risk by that distance.
The result is the position size in shares.

A worked case. The account is 40,000 and risk per trade is one per cent, so 400 is at stake. ATR is 1.80 and the multiple is two, making the stop distance 3.60. Dividing 400 by 3.60 gives about 111 shares.

Now the same account on a quieter stock where ATR is 0.60. The stop distance is 1.20, and 400 divided by 1.20 is about 333 shares. Three times the share count, identical risk.

That is the whole mechanism. The share count varies enormously; the amount at stake does not. Our guide to position sizing and expectancy covers why holding that figure constant matters more to long run results than the entry does, and the position size calculator runs the arithmetic.

Placing it against structure, not just arithmetic

An ATR distance is a volatility measurement, not a chart reading, and the best stops usually respect both.

If two ATR below entry lands just above an obvious support shelf, the stop is sitting exactly where a normal retest would reach it. Placing it slightly beyond that level instead costs a little more per share and avoids being removed by the very behaviour the setup anticipated. If two ATR lands well below structure, that is a signal the entry is far from its invalidation point, and the honest response is often a better entry rather than a tighter stop.

Reading the levels is covered in support and resistance. The combination to aim for is a stop that is both outside ordinary noise and beyond the price that would prove the idea wrong.

Trailing with ATR

The same construction trails. After each bar, recalculate ATR, apply the multiple from the highest close since entry, and move the stop up only if the new level is higher than the current one. It never moves down.

Two consequences are worth knowing in advance. A trailing ATR stop always gives back part of the open profit, because the exit sits a fixed distance below the peak by construction. And it widens automatically when volatility expands, which keeps you in a fast trend but means the giveback grows exactly when the position is largest.

Strategies that depend on a small number of outsized winners tolerate that well. Strategies built on frequent modest gains usually do not, and a fixed target serves them better.

The common mistakes

Moving the stop to avoid a loss. Widening a stop as price approaches it converts a planned small loss into an unplanned larger one. The decision to accept the risk was made at entry.

Recalculating the multiple per trade. If the multiple is chosen to make a particular position size look acceptable, the stop is being fitted to the trade rather than the trade to the stop.

Ignoring the gap risk. An ATR stop is a price level, not a guarantee. A stock that gaps through it opens the position at whatever the market offers, which is why stop orders are not guaranteed and why position size rather than stop placement is the real control on a bad day.

Using ATR as a signal. ATR rising tells you the range is expanding. It does not tell you which way. Reading a rising ATR as bullish is a category error, and a common one.