Average True Range (ATR)
Average True Range measures market volatility by averaging the daily true price range over a period, capturing how much an asset typically moves regardless of direction.
Average True Range (ATR), introduced by J. Welles Wilder, is a volatility indicator that quantifies how much an asset moves on a typical day. It is built from the "true range," which for each period is the largest of three values: the current high minus the current low, the absolute difference between the current high and the previous close, and the absolute difference between the current low and the previous close. Including the previous close captures overnight gaps that a simple high-minus-low would miss. ATR is then the moving average (usually a 14-period smoothed average) of these true-range values.
Crucially, ATR measures the magnitude of movement, not its direction. A rising ATR signals expanding volatility and larger price swings; a falling ATR signals quieting markets. Traders rarely use it as a buy/sell signal on its own. Instead it is a sizing and risk tool: stop-loss distances are often set as a multiple of ATR so they adapt to current conditions, and position sizes can be scaled inversely to ATR so each trade carries comparable dollar risk. Because ATR is expressed in price units, it is not directly comparable across instruments unless normalized.
ATR is widely used in volatility-based stops (such as the chandelier exit), breakout filters, and Wilder's own systems. Its main caveat is that it is backward-looking and reacts to, rather than predicts, volatility regimes.
On hedgewing.ai, ATR and related volatility measures are part of the engineered feature set and also inform the platform's institutional risk analytics. Volatility context helps the four-model ensemble distinguish meaningful moves from noise, and ATR-style measures feed naturally into position-sizing and risk metrics such as Value at Risk and maximum drawdown that accompany each forecast, so signals are always framed by how much the asset can realistically move.
Related terms
Volatility · Value at Risk (VaR) · Maximum Drawdown · Standard Deviation
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