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Average True Range (ATR): An Essential Tool for Volatility Assessment in Trading

Updated: Feb 18


When it comes to trading and investing in the financial markets, knowledge of various technical indicators is invaluable. Understanding these indicators can help investors gauge market trends, predict future movements, and manage risk more effectively. One such crucial metric is the Average True Range (ATR), a technical indicator that measures market volatility. This article provides an in-depth understanding of ATR, its computation, interpretation, and application in trading strategies.


What is Average True Range (ATR)?


The Average True Range (ATR) is a technical analysis indicator used to measure volatility. It was developed by J. Welles Wilder in the 1970s for commodities but has since been applied across various financial instruments, including stocks, forex, and futures. ATR doesn't provide a directional bias or predict price trends. Instead, it measures the degree of price volatility by decomposing the entire range of an asset's price for that period. Increased ATR values indicate greater price volatility, while lower ATR values suggest lower volatility.



Calculating ATR


Calculating the ATR involves three primary steps:


True Range (TR) Calculation: The TR for a period is calculated as the greatest of the following:


  • Current high minus the current low.

  • The absolute value of the current high minus the previous close.

  • The absolute value of the current low minus the previous close.


Initial ATR Calculation: The initial ATR is calculated as the average of the TR over a given period, commonly 14 periods.


Subsequent ATR Calculation: For subsequent periods, the ATR is smoothed using the following formula: ATR = [(Prior ATR x 13) + Current TR] / 14


The diagram Depicts


  • The True Range (TR) for each period as yellow.

  • The initial ATR, represented by the red dashed line and red shaded area.

  • The subsequent ATRs, represented by the green dots and green shaded areas.


Interpreting ATR


Higher ATR values imply higher volatility and potentially higher risk, while lower ATR values indicate lower market volatility. A rising ATR often suggests that traders are willing to pay more to enter the market, which can indicate increasing enthusiasm or fear about the underlying security. Conversely, a declining ATR could indicate waning interest or indecision.


ATR in Trading Strategies


  • Stop-Loss Placement: A common use of the ATR is in determining stop-loss levels. This application uses the idea that volatility informs the amount of risk on the table, hence the size of the buffer required to avoid whipsaws. For example, if a stock has an ATR of $2, a trader might place a stop-loss $4 away from their entry point to give the trade room to breathe.

  • Volatility-Based Position Sizing: Traders also use ATR to adjust their position size according to the current volatility. If the ATR is high, indicating high volatility, a trader might decrease their position size to limit potential losses. Conversely, during periods of low ATR, a trader may increase their position size.

  • Trend Discovery: While ATR does not provide a directional bias, in combination with other technical indicators, it can provide valuable insights. For instance, a rise in ATR in the context of a significant price increase can suggest the beginning of a new bullish trend. Conversely, if the ATR increases during a period of declining prices, it could indicate a bearish trend.


The Average True Range is a valuable technical analysis tool that measures market volatility. By providing a clear picture of price fluctuations, ATR helps traders manage their risks more effectively. Whether in determining stop-loss points, adjusting position sizes, or spotting potential trends, the ATR is an indispensable tool in a trader's toolkit. Like all indicators, the ATR should be used in conjunction with other forms of analysis to increase the probability of successful trading outcomes. The ATR is a measure of volatility, not trend direction, and understanding this distinction is crucial for its effective application. Remember, no single tool or method can guarantee trading success. However, using tools like the ATR can provide valuable insights into market behavior and help investors make more informed trading decisions.

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