ATR-Based Stop-Loss Placement
A stop inside one third of a typical candle will be hit by ordinary movement, on trades whose underlying read was perfectly sound.
ATR-based stops set the invalidation distance as a multiple of Average True Range, so the stop adapts to current volatility instead of staying at a fixed number. With a 60-pip ATR, a 1.5x stop is 90 pips and a 20-pip fixed stop sits inside a third of one typical candle. The position size then has to change with the stop distance to keep the money at risk constant.
What to remember
- A fixed stop is too tight in volatile conditions and too wide in quiet ones, and the same number causes both problems in the same month.
- True range includes gaps by comparing each high and low against the previous close, which is why it differs from simple high minus low.
- An adaptive stop without adaptive sizing defeats the point, since the money at risk then moves with volatility.
- A 2x ATR trail on a 60-pip ATR returns 120 pips from the peak by design, which is 30% of a 400-pip move.
Step 9 of 10 on Strategy Building Blocks
What a 20-pip stop costs on a 60-pip ATR
Average True Range measures how far an instrument typically moves in a period. Using it to set stops means the stop distance changes with conditions rather than staying at a number you picked once.
The case for that is best made with the failure it prevents. GBP/USD has a 14-period ATR of 60 pips on the 4-hour chart, meaning a typical 4-hour candle covers about 60 pips. A trader using a fixed 20-pip stop is placing the invalidation a third of one candle's normal range away from entry. It will be hit by ordinary movement, repeatedly, on trades whose underlying read was fine. The trader concludes their analysis is poor. The analysis was not the problem, the stop was inside the noise.
Run the same fixed 20-pip stop when ATR drops to 18 pips during a quiet week and the opposite problem appears. Now the stop is more than a full candle's range away, risking more than the conditions require, for no additional protection.
True range, and why it is not just high minus low
True range for a candle is the largest of three distances, each measured without regard to sign: the current high to the current low, the current high to the previous close, and the current low to the previous close. The last two exist to capture gaps, so a market that opens well away from the previous close records the full extent of that jump rather than only the range it traded afterwards.
ATR is then a moving average of that figure, usually over 14 periods. Two properties follow and both matter:
- It has no direction. A large ATR says the instrument is moving, not which way.
- It is an average of the past. ATR rises after volatility has already increased, so on the candle before a shock it is still reporting the calm that came first.
Choosing the multiple, and what each one buys
| Stop | On a 60-pip ATR | Behaviour |
|---|---|---|
| 1x ATR | 60 pips | Inside one typical candle, frequent stop-outs |
| 1.5x ATR | 90 pips | Common middle ground |
| 2x ATR | 120 pips | Survives most normal swings, larger per-trade loss |
| 3x ATR | 180 pips | Position trading territory, needs a much smaller size |
There is no correct multiple, only a trade-off. A wider stop is hit less often and costs more when it is hit. A tighter stop is cheaper per occurrence and triggers more often, including on trades that would have worked. What ATR provides is not an escape from that trade-off, it is a way of expressing the choice in units that adapt to the instrument, so the same 1.5x rule produces 90 pips on volatile GBP/USD and 25 pips on a quiet pair without any manual adjustment.
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ATR-Based Stop-Loss Placement: questions
What ATR multiplier should you use for a stop loss?
Is an ATR stop better than a fixed stop?
Does ATR predict volatility?
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