Indicators That Earn Their Place
The indicator that decides how far away your stop belongs.
intermediate · 3 min read · 15 XP
Most indicators try to tell you which way price will go. ATR does something more useful and far more reliable: it tells you how far price typically moves, which is what actually decides where your stop belongs.
ATR — Average True Range — is the average size of recent candles, including gaps.
"True range" for one candle is the largest of:
The extra two cases catch gaps, so a candle that opened far from the previous close is measured honestly. ATR averages that over N periods, usually 14.
The output is a number in price terms: "ATR(14) on EUR/USD H4 is 0.0032" means the average four-hour candle has been covering about 32 pips.
Why this is the most practical indicator there is
ATR does not predict direction — it measures scale. And scale is what determines whether a 20-pip stop is disciplined or absurd. On a pair whose average candle is 12 pips, a 20-pip stop is generous. On one whose average candle is 60 pips, the same stop is noise-bait: it will be hit by ordinary movement that means nothing.
A fixed stop — "I always use 20 pips" — silently changes meaning as conditions change.
In a quiet market, 20 pips is a wide stop that survives normal wobble. In a volatile one, 20 pips is inside the noise and gets taken out constantly for no informative reason. Same number, opposite behaviour, and the difference is invisible unless you are measuring.
A volatility-scaled stop fixes this. Something like:
stop distance = 1.5 × ATR(14)
Now your stop is always the same distance in the market's own units. When volatility doubles, your stop widens automatically, and the trade gets the same amount of room it always had.
Widening a stop without adjusting size increases your risk — which would defeat the point entirely. The two must move together:
position size = risk amount ÷ (stop distance × pip value)
Wider stop → smaller position → same money at risk. This is the single most important formula in trading, and it is the subject of a full lesson in the Risk Management path.
Volatility just doubled — resize the trade
Interactive exercise — enable JavaScript to try it.
Targets. If the average daily range is 90 pips and price has already moved 85 today, a further 60-pip target is asking for an unusually large day. ATR gives you a realistic ceiling.
Filtering. Some strategies only work above a volatility threshold. A breakout system in a market whose ATR has collapsed is going to produce breakouts that immediately fail.
Comparing pairs. ATR expressed as a percentage of price lets you compare volatility across pairs with different price scales — useful when deciding which of several setups deserves your risk.
There is no universal answer, and searching backtests for the "best" one is curve-fitting. What matters more is that you use a volatility-scaled multiple and keep it constant. A stable 2× ATR stop applied consistently will outperform an optimised 1.7× that you abandon the first time it is hit.
What to remember
ATR measures how far price typically moves, which is what determines where a stop belongs. Fixed-pip stops change meaning as volatility changes; ATR-scaled stops do not. Pair a volatility-scaled stop with a position size that adjusts inversely, and your money at risk stays constant whatever the market is doing.