The Average True Range measures how much a pair moves, on average, over a set number of bars. It captures the full range of each candle, including gaps, and averages it - so a rising ATR means volatility is expanding and a falling ATR means the market is calming down. It says nothing about direction, only distance.
What it measures
ATR is most useful not as a signal but as a unit of measurement. If a pair's ATR is 40 pips, a 10-pip stop is inside the noise and will be hit at random, while a stop placed at 1.5x ATR sits beyond normal movement. In the simulator, ATR is the engine behind the Keltner Channels and the UT Bot, both of which size their bands and trailing stops from it.
How to read it
Where traders get it wrong
The mistake is ignoring volatility entirely - using the same 20-pip stop on a quiet range day and a high-volatility news day. A fixed stop that works in calm conditions gets stopped out constantly when ATR doubles. Read ATR to set stops that fit the current market, then let the position size calculator shrink your lot as the stop widens so your dollar risk stays fixed.
An indicator confirms, it does not command. The signal is a reason to look, not an order to trade. Combine it with levels and the trend, and size every trade with the position size calculator so a false signal costs a small, fixed amount.
Test it before you trust it
Every indicator lags, because it is built from prices that have already printed. Add it to the chart in the simulator, trade the same setup with and without it across a large sample, and keep it only if it genuinely raises your expectancy - not because the signal looks convincing in hindsight.
To sanity-check what your ATR readings should look like, average daily range across 25 markets gives the long-run average daily range of every instrument in the simulator as a static reference table.
ATR FAQ
What does ATR measure in trading?
ATR, the Average True Range, measures how much a pair moves on average over a set number of bars, including any gaps. It is a pure volatility reading - a rising ATR means the market is moving more and a falling ATR means it is calming down. ATR says nothing about direction, only about the size of typical movement.
How do you use ATR for stop-loss?
Place your stop a multiple of ATR away from entry - commonly 1.5 to 2 times the current ATR - so it sits beyond normal market noise. This adapts your stop to conditions: it widens automatically when volatility rises and tightens when the market calms, rather than using the same fixed pip distance in every environment.
Is ATR a good indicator?
ATR is one of the most practical indicators because it measures something real and actionable - volatility - rather than trying to predict direction. It is excellent for setting stops and position sizes that fit the market. In the simulator it also powers the Keltner Channels and UT Bot, which build their bands and trailing stops from ATR.